UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2010

o TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT
OF 1934 FOR THE TRANSITION PERIOD ____________ TO ____________

Commission File Number 000-51221

PDC 2004-D Limited Partnership

(Exact name of registrant as specified in its charter)

West Virginia	20-0547582
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1775 Sherman Street, Suite 3000, Denver, Colorado 80203

(Address of principal executive offices) (Zip code)

(303) 860-5800

(Registrant's telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such files) and (2) has been subject to such filing requirements for the past 90 days.

Yes þ No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ¨ No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definition of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act:

Large accelerated filer o	Accelerated filer o

Non-accelerated filer o	Smaller reporting company þ

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No þ

As of September 30, 2010 the Partnership had 1,749.95 units of limited partnership interest and no units of additional general partnership interest outstanding.

INDEX TO REPORT ON FORM 10-Q

		Page
	PART I – FINANCIAL INFORMATION

	Note Regarding Forward-Looking Statements	1
Item 1.	Financial Statements (unaudited)
	Condensed Balance Sheets (unaudited)	2
	Condensed Statements of Operations (unaudited)	3
	Condensed Statements of Cash Flows (unaudited)	4
	Notes to Unaudited Condensed Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	13
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	24
Item 4.	Controls and Procedures	24

	PART II – OTHER INFORMATION

Item 1.	Legal Proceedings	26
Item 1A.	Risk Factors	26
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	26
Item 3.	Defaults Upon Senior Securities	26
Item 4.	[Removed and Reserved]	26
Item 5.	Other Information	26
Item 6.	Exhibits	27

	SIGNATURES	30

Index

NOTE REGARDING FORWARD-LOOKING STATEMENTS

This periodic report contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933 (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934 (“Exchange Act”) regarding PDC 2004-D Limited Partnership’s (the “Partnership” or the “Registrant”) business, financial condition, results of operations and prospects.

All statements other than statements of historical facts included in and incorporated by reference into this report are forward-looking statements. Words such as expects, anticipates, intends, plans, believes, seeks, estimates and similar expressions or variations of such words are intended to identify forward-looking statements herein, which include statements of estimated natural gas and oil production and reserves, drilling plans, future cash flows, anticipated liquidity, anticipated capital expenditures and the Managing General Partner Petroleum Development Corporation’s (“PDC”) strategies, plans and objectives. However, these words are not the exclusive means of identifying forward-looking statements herein. PDC now conducts business under the name “PDC Energy.”

Although forward-looking statements contained in this report reflect the Managing General Partner's good faith judgment, such statements can only be based on facts and factors currently known to the Managing General Partner. Consequently, forward-looking statements are inherently subject to risks and uncertainties, including risks and uncertainties incidental to the development, production and marketing of natural gas and oil, and actual outcomes may differ materially from the results and outcomes discussed in the forward-looking statements. Important factors that could cause actual results to differ materially from the forward-looking statements include, but are not limited to:

changes in production volumes, worldwide demand, and commodity prices for natural gas and oil;

changes in estimates of proved reserves;

declines in the values of the Partnership’s natural gas and oil properties resulting from impairments;

the timing and extent of the Partnership’s success in further developing and producing the Partnership’s natural gas and oil reserves;

the Managing General Partner’s ability to acquire drilling rig services, supplies and services at reasonable prices;

risks incident to the refracturing and operation of natural gas and oil wells;

future production and refracturing costs;

the availability of Partnership future cash flows for investor distributions or funding of Well Refracturing Plan activities;

the timing and closing, if consummated, of the proposed merger of the Partnership with and into PDC’s wholly-owned subsidiary, DP 2004 Merger Sub, LLC;

the availability of funding for the consideration payable by PDC and its wholly-owned subsidiary, DP 2004 Merger Sub, LLC to consummate the merger;

the availability of sufficient pipeline and other transportation facilities to carry Partnership production and the impact of these facilities on price;

the effect of existing and future laws, governmental regulations and the political and economic climate of the United States of America, or U.S.;

changes in environmental laws and the regulations and enforcement related to those laws;

the identification of and severity of environmental events and governmental responses to the events;

the effect of natural gas and oil derivatives activities;

conditions in the capital markets; and

losses possible from pending or future litigation.

Further, the Partnership urges the reader to carefully review and consider the cautionary statements made in this report, the Partnership’s annual reports on Form 10-K and Form 10-K/A for the year ended December 31, 2009 filed with the Securities and Exchange Commission, or SEC, on March 15, 2010 and August 20, 2010 (“2009 Form 10-K” or “2009 Form 10-K/A,” respectively) and the Partnership’s other filings with the SEC and public disclosures. The Partnership cautions you not to place undue reliance on forward-looking statements, which speak only as of the date made. Other than as required under the securities laws, the Partnership undertakes no obligation to update any forward-looking statements in order to reflect any event or circumstance occurring after the date of this report or currently unknown facts or conditions or the occurrence of unanticipated events.

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Index

PART I – FINANCIAL INFORMATION

Item 1.

Financial Statements(unaudited)

PDC 2004-D Limited Partnership

Condensed Balance Sheets

(unaudited)

	September 30, 2010			December 31, 2009*
Assets

Current assets:
Cash and cash equivalents	$	327,437		$	238,058
Accounts receivable		183,814			282,670
Oil inventory		22,014			17,913
Due from Managing General Partner-derivatives		853,878			476,907
Due from Managing General Partner-other, net		-			285,922
Total current assets		1,387,143			1,301,470


Oil and gas properties, successful efforts method, at cost		39,023,099			39,006,869
Less: Accumulated depreciation, depletion and amortization		(19,770,092	)		(17,783,836	)
Oil and gas properties, net		19,253,007			21,223,033

Due from Managing General Partner-derivatives		1,443,169			459,933
Other assets		44,494			25,623
Total noncurrent assets		20,740,670			21,708,589

Total Assets	$	22,127,813		$	23,010,059

Liabilities and Partners' Equity

Current liabilities:
Accounts payable and accrued expenses	$	56,033		$	32,277
Due to Managing General Partner-derivatives		484,086			457,791
Due to Managing General Partner-other, net		16,991			-
Total current liabilities		557,110			490,068

Due to Managing General Partner-derivatives		1,051,722			1,311,858
Asset retirement obligations		471,786			451,315
Total liabilities		2,080,618			2,253,241

Commitments and contingent liabilities

Partners' equity:
Managing General Partner		4,019,225			4,161,150
Limited Partners - 1,749.95 units issued and outstanding		16,027,970			16,595,668
Total Partners' equity		20,047,195			20,756,818

Total Liabilities and Partners' Equity	$	22,127,813		$	23,010,059

*Derived from audited 2009 balance sheet

See accompanying notes to unaudited condensed financial statements.

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Index

PDC 2004-D Limited Partnership

Condensed Statements of Operations

(unaudited)

	Three months ended September 30,					Nine months ended September 30,
	2010		2009			2010		2009
Revenues:
Natural gas and oil sales	$	588,185	$	579,681		$	2,228,559	$	1,692,348
Commodity price risk management gain (loss), net		760,658		(514,187	)		2,087,170		(1,217,701	)
Total revenues		1,348,843		65,494			4,315,729		474,647

Operating costs and expenses:
Natural gas and oil production costs		245,812		210,159			674,961		724,604
Direct costs - general and administrative		34,732		275,349			113,267		607,511
Depreciation, depletion and amortization		611,102		714,438			1,986,256		2,206,959
Accretion of asset retirement obligations		6,925		4,503			20,471		13,509
Total operating costs and expenses		898,571		1,204,449			2,794,955		3,552,583

Income (loss) from operations		450,272		(1,138,955	)		1,520,774		(3,077,936	)

Interest expense		-		(4,463	)		-		(4,463	)
Interest income		-		13,368			-		37,291

Net income (loss)	$	450,272	$	(1,130,050	)	$	1,520,774	$	(3,045,108	)

Net income (loss) allocated to partners	$	450,272	$	(1,130,050	)	$	1,520,774	$	(3,045,108	)
Less: Managing General Partner interest in net income (loss)		90,055		(226,010	)		304,155		(609,022	)
Net income (loss) allocated to Investor Partners	$	360,217	$	(904,040	)	$	1,216,619	$	(2,436,086	)

Net income (loss) per Investor Partner unit	$	206	$	(517	)	$	695	$	(1,392	)

Investor Partner units outstanding		1,749.95		1,749.95			1,749.95		1,749.95

See accompanying notes to unaudited condensed financial statements.

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Index

PDC 2004-D Limited Partnership

Condensed Statements of Cash Flows

(unaudited)

	Nine months ended September 30,
	2010			2009
Cash flows from operating activities:
Net income (loss)	$	1,520,774		$	(3,045,108	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization		1,986,256			2,206,959
Accretion of asset retirement obligations		20,471			13,509
Unrealized (gain) loss on derivative transactions		(1,594,048	)		2,911,589
Changes in operating assets and liabilities:
Decrease in accounts receivable		98,856			60,133
(Increase) decrease in oil inventory		(4,101	)		7,557
Increase in other assets		(18,871	)		(17,181	)
Increase (decrease) in accounts payable and accrued expenses		23,756			(30,814	)
Decrease in due from Managing General Partner - other, net		285,922			1,680,565
Increase in due to Managing General Partner - other, net		16,991			-
Net cash provided by operating activities		2,336,006			3,787,209

Cash flows from investing activities:
Capital expenditures for oil and gas properties		(16,230	)		(3,682	)
Net cash used in investing activities		(16,230	)		(3,682	)

Cash flows from financing activities:
Distributions to Partners		(2,230,397	)		(3,781,962	)
Net cash used in financing activities		(2,230,397	)		(3,781,962	)

Net increase in cash and cash equivalents		89,379			1,565
Cash and cash equivalents, beginning of period		238,058			236,493
Cash and cash equivalents, end of period	$	327,437		$	238,058

See accompanying notes to unaudited condensed financial statements.

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Index

PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

Note 1−General and Basis of Presentation

The PDC 2004-D Limited Partnership (the “Partnership”) was organized as a limited partnership on July 28, 2004 in accordance with the laws of the State of West Virginia for the purpose of engaging in the exploration and development of oil and natural gas properties. Upon completion of the sale of Partnership units on September 9, 2004, the Partnership was funded and commenced its business operations. The Partnership owns natural gas and oil wells located in Colorado and from the wells, the Partnership produces and sells natural gas and oil.

Purchasers of partnership units subscribed to and fully paid for 37.37 units of limited partner interests and 1,712.58 units of additional general partner interests at $20,000 per unit. In accordance with the terms of the Limited Partnership Agreement (the “Agreement”), Petroleum Development Corporation, a Nevada Corporation that now conducts business under the name “PDC Energy”, is the Managing General Partner of the Partnership (hereafter, the “Managing General Partner” or “PDC”) and has a 20% Managing General Partner ownership in the Partnership. Upon completion of the drilling phase of the Partnership's wells, all additional general partners units were converted into units of limited partner interests and thereafter became limited partners of the Partnership. Throughout the term of the Partnership, revenues, costs, and cash distributions are allocated 80% to the limited and additional general partners (collectively, the “Investor Partners”), which are shared pro rata based upon the portion of units owned in the Partnership, and 20% to the Managing General Partner.

As of September 30, 2010, there were 1,103 Investor Partners. As of September 30, 2010, the Managing General Partner has repurchased 89.85 units of the total 1,749.95 outstanding units of Partnership interests from Investor Partners at an average price of $9,082 per unit and, as a result, participates in the sharing of revenues, costs and cash distributions as both an investor partner and as the Managing General Partner.

The Managing General Partner, under the terms of the Drilling and Operating Agreement (the “D&O Agreement”), has full authority to conduct the Partnership’s business and actively manage the Partnership. The Partnership expects continuing operations of its natural gas and oil properties until such time that the Partnership’s wells are depleted or become uneconomical to produce, at which time that well may be sold or plugged, reclaimed and abandoned. The Partnership’s maximum term of existence extends through December 31, 2055, unless dissolved by certain conditions stipulated within the Agreement (which are unlikely to occur at this time) or by written consent of the Investor Partners owning a majority of outstanding units at that time.

On June 7, 2010, the Partnership, the Managing General Partner and its wholly-owned subsidiary, DP 2004 Merger Sub, LLC (“DP Merger Sub”), a Delaware limited liability company, entered into an agreement and plan of merger (the “Merger Agreement”), in which PDC seeks to acquire the Partnership, subject to the vote and approval of a majority of the limited partnership units held, as of the close of business on September 13, 2010, by Investor Partners of the Partnership, other than PDC and its affiliates (“unaffiliated Investor Partners”). For more information on the proposed Merger Agreement, see Note 3, Transactions with Managing General Partner and Affiliates−Proposed Merger with PDC and DP 2004 Merger Sub, LLC, which follows. Pending the outcome of the proposed Merger Agreement, the Managing General Partner suspended, as of July 1, 2010, the opportunity for an individual unaffiliated investor partner to request that PDC repurchase their respective limited partnership units.

In the Managing General Partner’s opinion, the accompanying interim unaudited condensed financial statements contain all adjustments (consisting of only normal recurring adjustments) necessary for a fair statement of the Partnership’s financial statements for interim periods in accordance with accounting principles generally accepted in the United States of America ("U.S. GAAP") and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission, or SEC. Accordingly, pursuant to such rules and regulations, certain notes and other financial information included in audited financial statements have been condensed or omitted. The information presented in this quarterly report on Form 10-Q should be read in conjunction with the Partnership’s audited financial statements and notes thereto included in the Partnership’s 2009 Form 10-K. The Partnership’s accounting policies are described in the Notes to Financial Statements in the Partnership’s 2009 Form 10-K and updated, as necessary, in this Form 10-Q. The results of operations for the three and nine months ended September 30, 2010, and the cash flows for the nine months ended September 30, 2010, are not necessarily indicative of the results to be expected for the full year or any other future period.

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Index

PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

Note 2−Recent Accounting Standards

Recently Adopted Accounting Standards

Fair Value Measurements and Disclosures

In January 2010, the Financial Accounting Standards Board (“FASB”) issued changes clarifying existing disclosure requirements related to fair value measurements. The update also added a new requirement to disclose fair value transfers in and out of Levels 1 and 2 and describe the reasons for the transfers. The adoption of these changes as of January 1, 2010, did not have a material impact on the Partnership’s accompanying unaudited condensed financial statements.

Recently Issued Accounting Standards

Fair Value Measurements and Disclosures

In January 2010, the FASB issued changes related to fair value measurements requiring gross presentation of activities within the Level 3 roll forward, whereby entities must present separately information about purchases, sales, issuances and settlements. This change will be effective for the Partnership’s financial statements issued for annual reporting periods beginning after December 15, 2010. The Partnership does not expect adoption of these changes to have a material effect on the Partnership’s financial statements and related disclosures.

Internal Control over Financial Reporting in Exchange Act Periodic Reports

By Final Rule effective September 21, 2010, the SEC amended its rules and forms to conform them to Section 404(c) of the Sarbanes-Oxley Act of 2002, or SOX, as added by the Dodd-Frank Wall Street Reform and Consumer Protection Act. The new SEC rules exempt the Partnership, as a smaller reporting company filer, from the SOX requirement that registrants which are accelerated or large accelerated filers, obtain and include in their annual report filed with the SEC, their independent registered public accounting firm’s attestation report on the effectiveness of the registrant’s internal controls over financial reporting.

Note 3−Transactions with Managing General Partner and Affiliates

Ongoing Partnership Business and Operations

The Managing General Partner transacts business on behalf of the Partnership under the authority of the D&O Agreement. Revenues and other cash inflows received on behalf of the Partnership are distributed to the Partners net of (after deducting) corresponding operating costs and other cash outflows incurred on behalf of the Partnership. The fair value of the Partnership’s portion of unexpired derivative instruments is recorded on the balance sheet under the captions “Due from Managing General Partner–derivatives,” in the case of net unrealized gains or “Due to Managing General Partner–derivatives,” in the case of net unrealized losses.

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Index

PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

The following table presents transactions with the Managing General Partner reflected in the balance sheet line item – Due from (to) Managing General Partner-other, net which remain undistributed or unsettled with the Partnership’s investors as of the dates indicated.

	September 30, 2010			December 31, 2009

Natural gas and oil sales revenues collected from the Partnership's third-party customers	$	211,641		$	269,194
Commodity Price Risk Management, Realized Gains		56,083			342,602
Other (1)		(284,715	)		(325,874	)
Total Due (to) from Managing General Partner-other, net	$	(16,991	)	$	285,922

(1)

All other unsettled transactions, excluding derivative instruments, between the Partnership and the Managing General Partner. The majority of these are operating costs or general and administrative costs which have not been deducted from distributions.

The following table presents Partnership transactions, excluding derivative transactions which are more fully detailed in Note 5, Derivative Financial Instruments, with the Managing General Partner and its affiliates for the three and nine months ended September 30, 2010 and 2009. “Well operations and maintenance” and “Gathering, compression and processing fees” are included in “Natural gas and oil production costs” on the statements of operations.

	Three months ended September 30,				Nine months ended September 30,
	2010		2009		2010		2009

Well operations and maintenance	$	172,301	$	135,959	$	453,728	$	505,145
Gathering, compression and processing fees		39,422		40,518		125,889		121,538
Direct costs - general and administrative		34,732		275,349		113,267		607,511
Cash distributions*		99,148		418,497		537,280		887,733

*Cash distributions include $16,893 and $91,200 during the three and nine months ended September 30, 2010, respectively, and $54,841 and $131,342 during the three and nine months ended September 30, 2009, respectively, related to equity cash distributions on Investor Partner units repurchased by PDC.

Proposed Merger with PDC and DP 2004 Merger Sub, LLC

On June 7, 2010, the Partnership, the Managing General Partner and DP Merger Sub, a wholly owned subsidiary of PDC, entered into the Merger Agreement, subject to the vote and approval of the holders of a majority of the limited partnership units held, as of close of business on September 13, 2010, by unaffiliated Investor Partners as well as the satisfaction of other customary closing conditions. The per unit merger value offered to unaffiliated Investor Partners under the Merger Agreement in exchange for their limited partnership units in the Partnership was based on an effective transaction date of May 1, 2010.

The Merger Agreement has been approved by PDC’s Board of Directors (the “Board”); PDC, as sole member of the DP Merger Sub; and by the Special Committee formed by the Board, comprised of four directors of PDC who are not officers or employees of the Partnership or PDC and have no economic interest in the Partnership, to represent the interests of the unaffiliated Investor Partners holding limited partnership units. The Board, on behalf of PDC individually, and the Special Committee, on behalf of PDC in its capacity as the Partnership’s Managing General Partner, have determined that the merger is advisable and in the best interests of PDC and the Partnership, respectively, and reasonably believe that the merger is fair to PDC and the unaffiliated Investor Partners in the Partnership, respectively.

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PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

Each member of the Special Committee, on behalf of PDC in its capacity as the Managing General Partner of the Partnership, has relied upon his own business judgment and analysis based on a variety of factors in addition to the financial analysis of an outside financial advisor with respect to the substantive fairness to the unaffiliated Investor Partners’ interests, from a financial point of view, of the consideration to be received by the unaffiliated Investor Partners pursuant to the Merger Agreement. Also, the Special Committee retained its own legal counsel to advise it regarding the terms of the proposed merger.

In early October 2010, definitive proxy statements were mailed to unaffiliated Investor Partners. Closing of the merger is conditioned on approval by a majority vote of unaffiliated Investor Partners on both proposals to (1) amend the limited partnership agreement to expressly provide unaffiliated Investor Partners the right to approve merger transactions and (2) approve the Merger Agreement. The Special Committee has recommended that the unaffiliated Investor Partners vote for the limited partnership amendment and the Merger Agreement.

If approved by the unaffiliated Investor Partners and completed, the separate existence of the Partnership will terminate and the unaffiliated Investor Partner’s (other than unaffiliated Investor Partners who properly exercise appraisal rights) will receive a cash payment in the amount of $7,544 per limited partnership unit, less the sum of all per unit cash distributions made after June 30, 2010, and before the transaction closes. Additionally, DP Merger Sub shall be the surviving entity of the merger and shall be wholly-owned by PDC, and the limited partners will have no continuing interest in the Partnership, since the Partnership will cease as a separate business entity. The merger will become effective following the filing of a certificate of merger with the Secretaries of State of West Virginia and Delaware as soon as practicable after the last condition precedent to the merger has been satisfied, or waived. Although there is no assurance of the likelihood or timing of the merger transaction, the closing date is currently expected to be in early December 2010. Following consummation of the merger, the Partnership will no longer be required to file reports with the SEC, and the unaffiliated Investor Partners will no longer participate in the Partnership’s future earnings or growth.

The Merger Agreement among the Partnership, PDC and its subsidiary DP Merger Sub, may be terminated, and the merger abandoned:

should all parties agree by mutual consent to terminate the Merger Agreement;

by any party thereto, should the proposed merger not occur by December 31, 2010;

by any party thereto, should consummation of the merger become illegal or be otherwise prohibited by law or regulation;

by any party thereto, should any suit or action be pending against parties to the Merger Agreement challenging the legality or any aspect of the merger transaction;

by the Special Committee, on behalf of the Partnership and prior to approval by unaffiliated Investor Partners, should the Special Committee believe it has received a superior offer that is more favorable to the unaffiliated Investor Partners; or

by PDC or the Partnership, should either PDC or the Partnership fail to perform its obligations under the Merger Agreement and such failure has a non-curable material adverse effect on the PDC or the Partnership, respectively, or materially and adversely affects the transactions contemplated by the Merger Agreement.

Regardless of whether the merger is consummated, all costs and expenses incurred by PDC, the Partnership and DP Merger Sub in connection with the merger agreement shall be paid by PDC.

Note 4−Fair Value Measurements

Derivative Financial Instruments. The Partnership measures fair value based upon quoted market prices, where available. The valuation determination includes: (1) identification of the inputs to the fair value methodology through the review of counterparty statements and other supporting documentation, (2) determination of the validity of the source of the inputs, (3) corroboration of the original source of inputs through access to multiple quotes, if available, or other information and (4) monitoring changes in valuation methods and assumptions. The methods described above may produce a fair value calculation that may not be indicative of future fair values. The valuation determination also gives consideration to nonperformance risk on Partnership liabilities in addition to nonperformance risk on PDC’s own business interests and liabilities, as well as the credit standing of derivative instrument counterparties. The Managing General Partner primarily uses financial institutions, which are also major lenders in PDC’s credit facility agreement, as counterparties to the Partnership’s derivative contracts. The Managing General Partner has evaluated the credit risk of the counterparties holding the Partnership’s derivative assets using relevant credit market default rates, giving consideration to amounts outstanding for each counterparty and the duration of each outstanding derivative position. Based on the Managing General Partner’s evaluation, as of September 30, 2010, the impact of non-performance risk on the fair value of the Partnership’s derivative assets and liabilities was not significant. Validation of the Partnership’s contracts’ fair values are performed internally and while the Managing General Partner uses common industry practices to develop valuation techniques, changes in the Managing General Partner’s pricing methodologies or the underlying assumptions could result in significantly different fair values. While the Managing General Partner believes these valuation methods are appropriate and consistent with those used by other market participants, the use of different methodologies, or assumptions, to determine the fair value of certain financial instruments could result in a different estimate of fair value.

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Index

PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

The following table presents, by hierarchy level, the Partnership’s derivative financial instruments, including both current and non-current portions measured at fair value.

	Quoted Prices in Active Markets (Level 1)			Significant Unobservable Inputs (Level 3)			Total

As of December 31, 2009
Assets:
Commodity based derivatives	$	465,312		$	471,528		$	936,840
Total assets		465,312			471,528			936,840

Liabilities:
Commodity based derivatives		(31,472	)		(72,095	)		(103,567	)
Basis protection derivative contracts		-			(1,666,082	)		(1,666,082	)
Total liabilities		(31,472	)		(1,738,177	)		(1,769,649	)

Net asset (liability)	$	433,840		$	(1,266,649	)	$	(832,809	)

As of September 30, 2010
Assets:
Commodity based derivatives	$	2,115,596		$	181,451		$	2,297,047
Total assets		2,115,596			181,451			2,297,047

Liabilities:
Commodity based derivatives		-			(63,340	)		(63,340	)
Basis protection derivative contracts		-			(1,472,468	)		(1,472,468	)
Total liabilities		-			(1,535,808	)		(1,535,808	)

Net asset (liability)	$	2,115,596		$	(1,354,357	)	$	761,239

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Index

PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

The following table presents the changes of the Partnership’s Level 3 derivative financial instruments measured on a recurring basis:

	Nine months ended September 30, 2010
Fair value, net liability, as of December 31, 2009	$	(1,266,649	)
Changes in fair value included in statement of operations line item:
Commodity price risk management, net		136,954
Settlements		(224,662	)
Fair value, net liability, as of September 30, 2010	$	(1,354,357	)

Change in unrealized gains (losses) relating to assets (liabilities) still held as of September 30, 2010 included in statement of operations line item:
Commodity price risk management, net	$	21,771

See Note 5, Derivative Financial Instruments, for additional disclosure related to the Partnership’s derivative financial instruments.

Non-Derivative Assets and Liabilities. The carrying values of the financial instruments comprising current assets and current liabilities approximate fair value due to the short-term maturities of these instruments.

Note 5−Derivative Financial Instruments

As of September 30, 2010, the Partnership had derivative instruments, comprised of commodity collars, commodity fixed-price swaps and basis protection swaps, in place for a portion of its anticipated production through 2013 for a total of 1,194,333 MMbtu of natural gas and 7,468 Bbls of oil. Partnership policy prohibits the use of natural gas and oil derivative instruments for speculative purposes.

The following table summarizes the line item and fair value amounts of the Partnership’s derivative instruments in the accompanying balance sheets.

			Fair Value
Derivative instruments not designated as hedge (1):		Balance Sheet Line Item	September 30, 2010		December 31, 2009

Derivative Assets:	Current
	Commodity contracts	Due from Managing General Partner-derivatives	$	853,878	$	476,907

	Non Current
	Commodity contracts	Due from Managing General Partner-derivatives		1,443,169		459,933


Total Derivative Assets			$	2,297,047	$	936,840

Derivative Liabilities:	Current
	Commodity contracts	Due to Managing General Partner-derivatives	$	45,656	$	32,349

	Basis protection contracts	Due to Managing General Partner-derivatives		438,430		425,442

	Non Current
	Commodity contracts	Due to Managing General Partner-derivatives		17,684		71,218

	Basis protection contracts	Due to Managing General Partner-derivatives		1,034,038		1,240,640

Total Derivative Liabilities			$	1,535,808	$	1,769,649

(1) As of September 30, 2010 and December 31, 2009, none of the Partnership’s derivative instruments were designated as hedges.

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Index

PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

The following table summarizes the impact of the Partnership’s derivative instruments on the Partnership’s accompanying statements of operations for the three and nine months ended September 30, 2010 and 2009.

	Three months ended September 30,
	2010							2009
Statement of operations line item	Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized			Realized and Unrealized Gains For the Current Period		Total		Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized			Realized and Unrealized Losses For the Current Period			Total

Commodity price risk management, net
Realized gains (losses)	$	9,393		$	45,586	$	54,979	$	439,779		$	(5,933	)	$	433,846
Unrealized (losses) gains		(9,393	)		715,072		705,679		(439,779	)		(508,254	)		(948,033	)
Total commodity price risk management gain (loss), net	$	-		$	760,658	$	760,658	$	-		$	(514,187	)	$	(514,187	)

	Nine months ended September 30,
	2010							2009
Statement of operations line item	Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized			Realized and Unrealized Gains For the Current Period		Total		Reclassification of Realized Gains (Losses) Included in Prior Periods Unrealized			Realized and Unrealized Gains (Losses) For the Current Period			Total

Commodity price risk management, net
Realized gains	$	90,376		$	402,746	$	493,122	$	1,321,723		$	372,165		$	1,693,888
Unrealized (losses) gains		(90,376	)		1,684,424		1,594,048		(1,321,723	)		(1,589,866	)		(2,911,589	)
Total commodity price risk management gain (loss), net	$	-		$	2,087,170	$	2,087,170	$	-		$	(1,217,701	)	$	(1,217,701	)

Concentration of Credit Risk. A significant component of the Partnership’s future liquidity is concentrated in derivative instruments that enables the Partnership to manage a portion of its exposure to price volatility from producing natural gas and oil. These arrangements expose the Partnership to the risk of nonperformance by the counterparties. The Managing General Partner primarily uses financial institutions, who are also major lenders in the Managing General Partner’s credit facility agreement, as counterparties to the derivative contracts. To date, the Partnership has experienced no counterparty defaults.

Note 6−Commitments and Contingencies

Environmental

Due to the nature of the natural gas and oil business, the Partnership is exposed to environmental risks. The Managing General Partner has various policies and procedures to avoid environmental contamination and mitigate the risks from environmental contamination. The Managing General Partner conducts periodic reviews to identify changes in the Partnership’s environmental risk profile. Liabilities are accrued when environmental assessments and/or clean-ups are probable and the costs can be reasonably estimated. As of September 30, 2010, the Partnership had accrued an environmental remediation liability included in the Balance Sheet line item captioned “Accounts payable and accrued expenses.” This accrual represents costs estimated to be incurred in addition to normal recurring environmental-related expenditures which have been incurred and recorded at September 30, 2010. During the third quarter of 2010, the Managing General Partner identified existing ground contamination at three of the Partnership's wells. The Partnership recorded an accrual of approximately $34,000, which is the estimated cost attributable to the Partnership, based principally on estimated third party costs, to remediate the ground contamination less actual costs incurred through September 30, 2010, if any. The Managing General Partner is not aware of any environmental claims existing as of September 30, 2010 which have not been provided for or would otherwise have a material impact on the Partnership’s financial statements. However, there can be no assurance that current regulatory requirements will not change or unknown past non-compliance with environmental laws will not be discovered on the Partnership’s properties.

In December 2008, the Managing General Partner received a Notice of Violation/Cease and Desist Order (the “Notice”) from the Colorado Department of Public Health and Environment (the “CDPHE”), related to the stormwater permit for the Garden Gulch Road. The Managing General Partner manages this private road for Garden Gulch LLC. The Managing General Partner is one of eight users of this road, all of which are natural gas and oil companies operating in the Piceance region of Colorado. Operating expenses, including this fine, if any, are allocated among the users of the road based upon their respective usage. The Partnership has 12 wells in this region. The Notice alleged a deficient and/or incomplete stormwater management plan, failure to implement best management practices and failure to conduct required permit inspections. The Notice requires corrective action and states that the recipient shall cease and desist such alleged violations. The Notice states that a violation could result in civil penalties up to $10,000 per day. The Managing General Partner’s responses were submitted on February 6, 2009, and April 8, 2009. Commencing in December 2009, the Managing General Partner entered into negotiations with the CDPHE regarding this notice and continues to work to bring this matter to closure. Given the inherent uncertainty in administrative actions of this nature, the Managing General Partner is unable to predict with certainty the ultimate outcome of this administrative action; however, the Managing General Partner does not believe that the ultimate outcome will have a material adverse effect on the Partnership’s financial position or results of operations.

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Index

PDC 2004-D LIMITED PARTNERSHIP

NOTES TO UNAUDITED CONDENSED FINANCIAL STATEMENTS

September 30, 2010

(unaudited)

Note 7−Subsequent Events

On October 20, 2010, the Managing General Partner notified Investor Partners by letter, that the Partnership commenced the withholding of funds, on a pro-rata basis allocated to the Managing General Partner and Investor Partners based on their proportional ownership interest, which will be utilized to further develop the Partnership’s Denver-Julesburg (“DJ”) Basin Wattenberg Field wells under the previously announced Well Refracturing Plan. The plan provides for the refracturing of the Partnership’s Wattenberg Field wells in the currently producing Codell formation and these activities are expected to begin mid-to-late 2011. Funds withheld from the Partnership’s investors, including the Managing General Partner, in the October 2010 distribution amounted to $20,000 and have been deposited in the Partnership’s bank account.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Item 2.

Management’s Discussion and Analysis of Financial Condition and Results of Operations

Partnership Overview

PDC 2004-D Limited Partnership engages in the development, production and sale of oil and natural gas. The Partnership began oil and gas operations in September 2004 and operates 44 gross (42.2 net) wells located in the Rocky Mountain Region in the state of Colorado. The Managing General Partner markets the Partnership’s natural gas production to commercial end users, interstate or intrastate pipelines or local utilities, primarily under market sensitive contracts in which the price of natural gas sold varies as a result of market forces. PDC does not charge an additional fee for the marketing of the natural gas and oil because these services are covered by the monthly well operating charge. PDC, on behalf of the Partnership in accordance with the D&O Agreement, is authorized to enter into multi-year fixed price contracts or utilize derivatives, including collars, swaps or basis protection swaps, in order to offset some or all of the commodity price variability for particular periods of time. Seasonal factors, such as effects of weather on prices received and costs incurred, and availability of pipeline capacity, owned by PDC or other third parties, may impact the Partnership's results. In addition, both sales volumes and prices tend to be affected by demand factors with a seasonal component.

Proposed Merger with PDC and DP 2004 Merger Sub, LLC

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

The Merger Agreement among the Partnership, PDC and its subsidiary DP Merger Sub, may be terminated, and the merger abandoned:

should all parties agree by mutual consent to terminate the Merger Agreement;

by any party thereto, should the proposed merger not occur by December 31, 2010;

by any party thereto, should consummation of the merger become illegal or be otherwise prohibited by law or regulation;

by any party thereto, should any suit or action be pending against parties to the Merger Agreement challenging the legality or any aspect of the merger transaction;

Regardless of whether the merger is consummated, all costs and expenses incurred by PDC, the Partnership and DP Merger Sub in connection with the merger agreement shall be paid by PDC.

The Managing General Partner, PDC, can provide no assurance that the proposed merger of the Partnership with and into PDC’s wholly-owned subsidiary DP Merger Sub, will be approved by the unaffiliated Investor Partners or that the other conditions to the completion of the merger will be satisfied or that the merger will ever be consummated. If the merger is not completed, the anticipated unaffiliated Investor Partner merger benefits that include unit liquidity and elimination of Schedule K-1 tax reports in the Partnership will not be realized and the Partnership will continue the existing business plan to optimally develop and cost-effectively operate the Partnership’s natural gas and oil reserves. This plan encompasses the October 2010 implementation of the Well Refracturing Plan, more fully outlined below. The information presented in this Quarterly Report on Form 10-Q for the quarter ended September 30, 2010 does not give effect to the proposed Merger Agreement.

On July 1, 2010, the Managing General Partner suspended the opportunity for an individual unaffiliated Investor Partner to request that PDC repurchase their respective limited partnership units under the terms of the program, pending the outcome of the proposed Merger Agreement.

Well Refracturing Plan

The Managing General Partner has developed the Well Refracturing Plan for the Partnership’s Wattenberg Field wells that were initially completed in the Codell formation during the Partnership’s initial development. Under the plan, the Partnership will initiate Codell formation refracturing activities during 2011. These refracturing, or “refracing”, activities will consist of a second hydraulic fracturing treatment to the currently producing Codell formation.

Funding of the initial well refracturing activity began with the withholding, on a pro-rata basis, of $20,000 from the Partnership’s October 2010 monthly distributable cash flows which was allocated to the Managing General Partner and Investor Partners based on their proportional ownership interest. This withholding was deposited into the Partnership’s bank account.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

After the initial refrac funding is completed in 2011, the Partnership will re-evaluate the Well Refracturing Plan funding requirements and will continue to withhold cash at varying levels on a pro-rata basis, from the Managing General Partner’s and Investor Partner’s distributable cash flows from current production operations. The most recent cost projection for Codell formation well refracturing ranges between $150,000 and $200,000 per refrac. Total withholding from the Partnership’s distributable cash flows for the Partnership’s 30 well refracturing opportunities is estimated to be between $4.5 million and $6.0 million. The number of refracturings and the timing of refracturing will be based on the availability of cash withheld from Partnership distributions. The necessary funds to be retained by the Partnership for the payment of Well Refracturing Plan activities may materially reduce, up to 100%, of the Managing General Partner’s and Investor Partners’ distributable cash flows for a period of time not to exceed five years.

Partnership Operating Results Overview

Natural gas and oil sales increased 32% or $0.5 million for the first nine months of 2010 compared to the first nine months of 2009, even though production volumes decreased 9% period-to-period. This increase was driven primarily by the improved commodity price environment. The average sales price per Mcfe, excluding the impact of realized derivative gains, was $4.96 for the current year period compared to $3.42 for the same period a year ago. Realized derivative gains from natural gas and oil sales contributed an additional $1.10 per Mcfe or $0.5 million to the first nine months of 2010 total revenues. Comparatively, the total per Mcfe price realized, consisting of the average sales price and realized derivative gains, decreased to $6.06 for the current year nine months from $6.85 for the same prior year period.

The increase in total revenues did not have a corresponding impact on costs and expenses as natural gas and oil production costs and direct costs−general and administrative expense combined decreased by $0.5 million for the current year nine months compared to the same prior year period. The decrease is primarily due to a reduction in professional fees in the 2010 period compared to the 2009 period.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Results of Operations

The following table presents selected information regarding the Partnership’s results of operations.

	Three months ended September 30,							Nine months ended September 30,
	2010		2009		Change			2010		2009		Change
Number of producing wells (end of period)		44		44		0			44		44		0

Production (1)
Natural gas (Mcf)		125,875		142,832		-12	%		387,676		419,648		-8	%
Oil (Bbl)		2,479		3,687		-33	%		10,215		12,461		-18	%
Natural gas equivalents (Mcfe) (2)		140,749		164,954		-15	%		448,966		494,414		-9	%

Natural Gas and Oil Sales
Natural gas	$	415,168	$	354,135		17	%	$	1,484,048	$	1,082,430		37	%
Oil		173,017		225,546		-23	%		744,511		609,918		22	%
Total natural gas and oil sales	$	588,185	$	579,681		1	%	$	2,228,559	$	1,692,348		32	%

Realized Gain on Derivatives, net
Natural gas	$	9,046	$	363,657		-98	%	$	368,595	$	1,380,666		-73	%
Oil		45,933		70,189		-35	%		124,527		313,222		-60	%
Total realized gain on derivatives, net	$	54,979	$	433,846		-87	%	$	493,122	$	1,693,888		-71	%

Average Selling Price (excluding realized gain on derivatives)
Natural gas (per Mcf)	$	3.30	$	2.48		33	%	$	3.83	$	2.58		48	%
Oil (per Bbl)		69.79		61.17		14	%		72.88		48.95		49	%
Natural gas equivalents (per Mcfe)		4.18		3.51		19	%		4.96		3.42		45	%

Average Selling Price (including realized gain on derivatives)
Natural gas (per Mcf)	$	3.37	$	5.03		-33	%	$	4.78	$	5.87		-19	%
Oil (per Bbl)		88.32		80.21		10	%		85.07		74.08		15	%
Natural gas equivalents (per Mcfe)		4.57		6.14		-26	%		6.06		6.85		-12	%

Average Lifting Cost (per Mcfe) (3)	$	1.75	$	1.27		38	%	$	1.50	$	1.47		2	%

Operating costs and expenses
Direct costs - general and administrative	$	34,732	$	275,349		-87	%	$	113,267	$	607,511		-81	%
Depreciation, depletion and amortization	$	611,102	$	714,438		-14	%	$	1,986,256	$	2,206,959		-10	%

Cash distributions	$	411,275	$	1,818,283		-77	%	$	2,230,397	$	3,781,962		-41	%

______________

(1)

Production is determined by multiplying the gross production volume of properties in which the Partnership has an interest by the percentage of the leasehold or other property interest the Partnership owns.

(2)

A ratio of energy content of natural gas and oil (six Mcf of natural gas equals one Bbl of oil) was used to obtain a conversion factor to convert oil production into equivalent Mcf of natural gas.

(3)

Lifting costs represent natural gas and oil operating expenses which include production taxes.

Definitions used throughout Management’s Discussion and Analysis of Financial Condition and Results of Operations:

Bbl – One barrel or 42 U.S. gallons liquid volume

MBbl – One thousand barrels

Mcf – One thousand cubic feet

MMcf – One million cubic feet

Mcfe – One thousand cubic feet of natural gas equivalents

MMcfe – One million cubic feet of natural gas equivalents

MMbtu – One million British Thermal Units

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Natural Gas and Oil Sales

Nine months ended September 30, 2010 as compared to nine months ended September 30, 2009

The $0.5 million, or 32% increase in sales for the 2010 nine month period as compared to the prior year period, was primarily a reflection of the significantly higher average sales price per Mcfe of 45%, which was partially offset by a production volume decrease of 9%. The average sales price per Mcfe, excluding the impact of realized derivative gains, was $4.96 for the current year nine month period compared to $3.42 for the same period a year ago.

Natural gas and oil revenues increased by 37% and 22%, respectively. The Partnership’s natural gas revenue increase resulted from rising commodity prices per Mcf of 48%, which were partially offset by lower Partnership natural gas production volumes of 8%. This compares to the oil revenue increase in which the rise in commodity prices per Bbl of 49%, was partially offset by the more significant decline in oil production volumes of 18%, during the current nine month period.

Three months ended September 30, 2010 as compared to three months ended September 30, 2009

Sales for the 2010 third quarter remained substantially unchanged at $0.6 million compared to the prior year third quarter. This stability in quarter-to-quarter Partnership natural gas and oil revenues is primarily a reflection of the higher average sales price per Mcfe of 19%, which was substantially offset by the production volume decrease of 15%. Average sales prices per Mcfe, excluding the impact of realized derivative gains, were $4.18 for the current year quarter compared to $3.51 for the same quarter a year ago.

The Partnership expects to experience declines in both natural gas and oil production volumes over the wells’ life cycles until such time that the Partnership’s Wattenberg wells may be successfully refraced. Subsequent to a successful refracturing, production will once again be expected to decline.

Natural Gas and Oil Pricing

Financial results depend upon many factors, particularly the price of natural gas and oil and on PDC’s ability to market the Partnership’s production effectively. Natural gas and oil prices are among the most volatile of all commodity prices. This price volatility has a material impact on the Partnership’s financial results. Natural gas and oil prices also vary by region and locality, depending upon the distance to markets, and the supply and demand relationships in that region or locality and availability of sufficient pipeline capacity. This can be especially true in the Rocky Mountain Region. The combination of increased drilling activity and the lack of local markets have resulted in local market oversupply situations from time to time. Like most producers in the region, the Partnership relies on major interstate pipeline companies to construct these pipelines to increase capacity, rendering the timing and availability of these facilities and transportation capacity beyond the Partnership’s control. Oil pricing, unlike natural gas pricing, is driven predominantly by global supply and demand relationships.

The price at which PDC markets the natural gas produced in the Rocky Mountain Region by the Partnership is based on a variety of prices, which primarily includes natural gas sold at Colorado Interstate Gas, or CIG, prices with a portion sold at Mid-Continent, San Juan Basin, Southern California or other nearby regional prices. The CIG Index, and other indices for production delivered to Rocky Mountain pipelines, has historically been less than the price received for natural gas produced in the eastern regions, which is primarily New York Mercantile Exchange, or NYMEX, based, because of the lack of interstate transmission capacity which moved Rocky Mountain natural gas production to Northeastern U.S. industrial and heating markets. This negative differential has narrowed in the last year and is lower than historical variances. This negative differential between NYMEX and CIG averaged $0.72 and $1.16 for the three and nine months ended September 30, 2009, respectively, and narrowed to an average of $0.51 and $0.88 for the three and nine months ended September 30, 2010, respectively.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Commodity Price Risk Management, Net

The Managing General Partner, on behalf of the Partnership in accordance with the D&O Agreement, is authorized to utilize various derivative instruments to manage volatility in natural gas and oil prices. Commodity price risk management, net, includes realized gains and losses and unrealized changes in the fair value of derivative instruments related to the Partnership’s natural gas and oil production. The Managing General Partner sets these instruments for PDC, and the various partnerships managed by PDC. Derivative financial instrument positions taken by the Managing General Partner on the Partnership’s behalf are specifically designated to the Partnership’s production volumes. See Note 4, Fair Value Measurements and Note 5, Derivative Financial Instruments, to the Partnership’s unaudited condensed financial statements included in this report, for additional details on the Partnership’s derivative financial instruments.

The following table presents the realized and unrealized derivative gains and losses included in commodity price risk management gain (loss), net.

	Three months ended September 30,						Nine months ended September 30,
Commodity price risk management gain (loss), net	2010			2009			2010			2009
Realized gains
Natural Gas	$	9,046		$	363,657		$	368,595		$	1,380,666
Oil		45,933			70,189			124,527			313,222
Total realized gain, net		54,979			433,846			493,122			1,693,888

Unrealized gains (losses)
Reclassification of realized gains included in prior periods unrealized		(9,393	)		(439,779	)		(90,376	)		(1,321,723	)
Unrealized gain (loss) for the period		715,072			(508,254	)		1,684,424			(1,589,866	)
Total unrealized gain (loss), net		705,679			(948,033	)		1,594,048			(2,911,589	)
Commodity price risk management gain (loss), net	$	760,658		$	(514,187	)	$	2,087,170		$	(1,217,701	)

Nine months ended September 30, 2010 as compared to nine months ended September 30, 2009

The realized derivative gains for the 2010 nine month period were $0.5 million. These realized gains were primarily a result of lower natural gas and oil spot prices at settlement compared to the respective strike price, offset in part by realized losses due to the basis differential between NYMEX and CIG being narrower than the strike price of the derivative position. For the 2010 nine month period, realized gains related to the Partnership’s commodity positions were $0.8 million and realized losses on the Partnership’s basis position were $0.3 million. Unrealized gains for the 2010 nine month period were $1.7 million due primarily to a downward shift in the natural gas and oil forward curves, offset by unrealized losses due to the basis differential between NYMEX and CIG being narrower than the strike price of the derivative position. Unrealized gains on the Partnership’s commodity positions for the 2010 nine month period were $1.8 million offset by unrealized losses on the Partnership’s basis position of $0.1 million.

For the 2009 nine month period, the Partnership realized significant derivative gains as a result of lower natural gas and oil prices at settlement compared to the respective derivative strike prices. Unrealized losses for the period were related to oil swaps, as the forward strip price of oil rebounded during the period, and the CIG basis swaps, as the forward basis differential during the period between NYMEX and CIG continued to narrow from the strike price of the derivative position.

Three months ended September 30, 2010 as compared to three months ended September 30, 2009

The realized derivative gains for the 2010 third quarter were approximately $0.1 million. These realized gains are a result of lower natural gas and oil spot prices at settlement compared to the respective strike price, offset in part by realized losses due to the basis differential between NYMEX and CIG being narrower than the strike price of the derivative position. For the quarter, realized gains related to the Partnership’s commodity positions were $0.2 million, which were partially offset by realized losses on the Partnership’s basis position of approximately $0.1 million. For the 2010 quarter, the unrealized gains of $0.7 million were primarily related to the commodity positions, as the forward strip price shifted downward during the quarter, and the widening of the NYMEX-CIG basis differential. Unrealized gains on the Partnership’s commodity positions for the 2010 third quarter were $0.8 million, which were partially offset by unrealized losses on the Partnership’s basis position of $0.1 million.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

For the 2009 third quarter, the Partnership realized significant derivative gains as a result of lower natural gas and oil prices at settlement compared to the respective derivative strike prices. Unrealized losses for the period were primarily related to oil swaps, as the forward strip price of oil rebounded during the period, and the CIG basis swaps, as the forward basis differential during the period between NYMEX and CIG continued to narrow from the strike price of the derivative position.

Natural Gas and Oil Sales Derivative Instruments. The Managing General Partner, on behalf of the Partnership in accordance with the D&O Agreement, is authorized to utilize various derivative instruments to manage volatility in natural gas and oil prices. The Partnership has in place a series of collars, fixed-price swaps and a basis swap on a portion of the Partnership’s natural gas and oil production. See Note 5, Derivative Financial Instruments to the Partnership’s financial statements included in the 2009 Form 10-K for an additional discussion on how each derivative type impacts the Partnership’s cash flows.

The following table presents the Partnership’s derivative positions in effect as of September 30, 2010.

	Collars						Fixed-Price Swaps				CIG Basis Protection Swaps
	Quantity (Gas-		Weighted Average Contract Price				Quantity (Gas- Mmbtu(1)		Weighted Average Contract		Quantity (Gas-		Weighted Average Contract			Fair Value at September 30,
Commodity/Index	Mmbtu(1))		Floors		Ceilings		Oil-Bbls)		Price		Mmbtu(1))		Price			2010(2)

Natural Gas
CIG
10/01 - 12/31/2010		31,772	$	4.75	$	9.45		-	$	-		-	$	-		$	35,388
01/01 - 03/31/2011		47,658		4.75		9.45		-		-		-		-			44,230

NYMEX
10/01 - 12/31/2010		11,059		5.75		8.30		61,072		6.14		74,981		(1.88	)		47,849
01/01 - 03/31/2011		15,000		5.75		8.30		37,185		6.83		52,185		(1.88	)		40,582
04/01 - 06/30/2011		-		-		-		99,783		6.78		99,783		(1.88	)		118,761
07/01 - 09/30/2011		-		-		-		98,475		6.73		98,475		(1.88	)		96,596
10/01 - 12/31/2011		-		-		-		95,928		6.78		95,928		(1.88	)		60,275
2012-2013		24,034		6.00		8.27		672,367		7.05		696,401		(1.88	)		348,856
Total Natural Gas		129,523						1,064,810				1,117,753					792,537

Oil
NYMEX
10/01 - 12/31/2010		-		-		-		2,742		92.96		-		-			32,042
01/01 - 03/31/2011		-		-		-		1,146		70.75		-		-			(13,750	)
04/01 - 06/30/2011		-		-		-		1,171		70.75		-		-			(15,328	)
07/01 - 09/30/2011		-		-		-		1,194		70.75		-		-			(16,577	)
10/01 - 12/31/2011		-		-		-		1,215		70.75		-		-			(17,685	)
Total Oil		-						7,468				-					(31,298	)

Total Natural Gas and Oil																$	761,239

(1)

A standard unit of measure for natural gas (one Mmbtu equals one Mcf).

(2)

Approximately 8% of the fair value of the Partnership’s derivative assets and all of the Partnership’s derivative liabilities were measured using significant unobservable inputs (Level 3), see Note 4, Fair Value Measurements, to the accompanying unaudited condensed financial statements included in this report.

Natural Gas and Oil Production Costs

Generally, natural gas and oil production costs vary with changes in total natural gas and oil sales and production volumes. Production taxes are estimates by the Managing General Partner based on tax rates determined using published information. These estimates are subject to revision based on actual amounts determined during future filings by the Managing General Partner with the taxing authorities. Production taxes vary directly with total natural gas and oil sales. Transportation costs vary directly with production volumes. Fixed monthly well operating costs increase on a per unit basis as production decreases per the historical decline curve. In addition, general oil field services and all other costs vary and can fluctuate based on services required but are expected to increase as wells age and require more extensive repair and maintenance. These costs include water hauling and disposal, equipment repairs and maintenance, snow removal, environmental compliance and remediation and service rig workovers.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Nine months ended September 30, 2010 as compared to nine months ended September 30, 2009

For the nine months ended September 30, 2010 compared to the same period in 2009, natural gas and oil production, on an energy equivalency-basis, decreased 9%, which reflects the normally-occurring production declines throughout a natural gas and oil well’s production life cycle. Current period production and operating costs were substantially unchanged at $0.7 million. This expense stability is partially the result of higher 2010 well operations costs due to the increase in the per well operations fee charged by the Managing General Partner, consistent with the terms of the D&O Agreement, combined with the current quarter recognition of well site environmental remediation costs of $34,000. These cost increases were offset by volume-associated reductions in production taxes, natural gas transportation and lease operating expenses during the period. Production and operating costs were $1.50 during the current period compared to $1.47 for the prior year period.

Three months ended September 30, 2010 as compared to three months ended September 30, 2009

For the quarter ended September 30, 2010 compared to the same period in 2009, natural gas and oil production, on an energy equivalency-basis, decreased 15%, primarily as a result expected normally-occurring production life-cycle decline in both operating fields. Production and operating costs were higher by $36,000 primarily due to accruing well site environmental remediation costs during the quarter and higher well operating fees, noted above. These cost increases were substantially offset by the lower volume-associated production costs described more fully, above. Production and operating costs per Mcfe rose to $1.75 during the current period compared to $1.27 for the prior year period due to the effect of higher per-well related expenditures offset by lower per-volume related natural gas and oil production costs.

Direct Costs−General and Administrative

Nine months ended September 30, 2010 as compared to nine months ended September 30, 2009

Direct costs – general and administrative consist primarily of professional fees for financial statement audits, income tax return preparation, independent engineer’s reserve reports and legal matters. Direct costs decreased during the nine months ended September 30, 2010, compared to the same period in 2009, by approximately $0.5 million principally due to reduced billings for professional services.

Three months ended September 30, 2010 as compared to three months ended September 30, 2009

Direct costs – general and administrative consist primarily of professional fees for financial statement audits, income tax return preparation, independent engineer’s reserve reports and legal matters. Direct costs decreased during the three months ended September 30, 2010, compared to the same period in 2009, by approximately $0.2 million principally due to reduced billings for professional services.

Depreciation, Depletion and Amortization

DD&A expense related to natural gas and oil properties is directly related to production volumes for the period. For the quarter ended September 30, 2009, the Partnership’s natural gas and oil economically producible reserve quantities were determined by valuing in-ground natural gas and oil resources, at the price of natural gas and oil as of December 31, 2008. Upon adoption, in the fourth quarter of 2009, of the SEC’s final rule regarding the modernization of oil and gas reporting, the Partnership changed to a valuation price determined by the 12-month average of the first-day-of-the-month price during each month of 2009.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Nine months ended September 30, 2010 as compared to nine months ended September 30, 2009

The DD&A expense rate per Mcfe decreased to $4.42 for the 2010 nine month period, compared to $4.46 during the same period in 2009, as calculated by the respective methodologies described above. The reduction in the per Mcfe rates for the 2010 period compared to the 2009 period is primarily the result of the changing production mix between the Partnership’s Wattenberg and Grand Valley Fields, which have significantly different DD&A rates. This was partially offset by higher depletion rates due to the lower proved developed producing reserves, particularly reductions in the Grand Valley Field relative to the Wattenberg Field, at December 31, 2009 compared to December 31, 2008. These lower rates and the effect of the production declines noted in previous sections, resulted in reduced DD&A expense of approximately $0.2 million for the 2010 nine month period compared to the same 2009 period.

Three months ended September 30, 2010 as compared to three months ended September 30, 2009

The DD&A expense rate per Mcfe increased marginally to $4.34 for the 2010 third quarter, compared to $4.33 during the same quarter in 2009 as calculated by the respective methodologies described above. The variance in the per Mcfe rates for the 2010 third quarter compared to the 2009 third quarter is a result of the combined effects of the changing production mix between fields and lower proved developed producing reserves, noted above. These substantially unchanged rates and effect of the production declines noted in previous sections, resulted in the DD&A expense decrease of approximately $0.1 million for the 2010 third quarter compared to the same 2009 quarter.

Capital Resources and Liquidity

The Partnership’s primary sources of cash for both the three and the nine months ended September 30, 2010 were from funds provided by operating activities which include the sale of natural gas and oil production and the realized gains from the Partnership’s derivative positions. These sources of cash were primarily used to fund the Partnership’s operating costs, general and administrative activities and provide monthly distributions to the Investor Partners and PDC, the Managing General Partner. Fluctuations in the Partnership’s operating cash flow are substantially driven by changes in commodity prices, in production volumes and in realized gains and losses from commodity positions. Commodity prices have historically been volatile and the Partnership attempts to manage this volatility through derivatives. Therefore, the primary source of the Partnership’s cash flow from operations becomes the net activity between the Partnership’s natural gas and oil sales and realized derivative gains and losses. However, the Partnership does not engage in speculative positions, nor does the Partnership hold economic hedges for 100% of the Partnership’s expected future production from producing wells and therefore may still experience significant fluctuations in cash flows from operations. As of September 30, 2010, the Partnership had natural gas and oil derivative positions in place covering 85% of the expected natural gas production and 87% of expected oil production for the remainder of 2010, at an average price of $4.32 per Mcf and $92.96 per Bbl, respectively. The Partnership’s current derivative position average prices have declined from the significantly higher average commodity contract strike price levels in effect during the 2009 comparative period, which were the result of contracts entered into during the high 2008 commodity price market; accordingly, the Partnership anticipates realized gains for the next 12 months to remain substantially below gains realized in 2009 and the first quarter of 2010. See Results of Operations for further discussion of the impact of prices and volumes on sales from operations and the impact of derivative activities on the Partnership’s revenues.

The Partnership’s future operations are expected to be conducted with available funds and revenues generated from natural gas and oil production activities and commodity gains, if any. Natural gas and oil production from the Partnership’s existing properties are generally expected to continue a gradual decline in the rate of production over the remaining lives of the wells. Therefore, the Partnership anticipates a lower annual level of natural gas and oil production and, in the absence of significant price increases or successful refracturings, lower revenues. The Partnership also expects cash flows from operations to decline if commodity prices remain at current levels or decrease in the future. Under these circumstances decreased production would have a material negative impact on the Partnership’s operations and may result in reduced cash distributions to the Investor Partners through the remainder of 2010 and beyond, and may substantially reduce or restrict the Partnership’s ability to participate in the Well Refracturing Plan activities which are more fully described in Item 2, Management’s Discussion and Analysis of Financial Condition and Results of Operations−Well Refracturing Plan.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Working Capital

Working capital at September 30, 2010 was $0.8 million, unchanged from working capital at December 31, 2009. Changes in accounts receivable or payable balances that comprise working capital during the comparative period are as follows:

Cash and cash equivalents increased by $0.1 million as of September 30, 2010 compared to December 31, 2009.

Natural gas and oil receivables decreased by $0.2 million as of September 30, 2010 compared to December 31, 2009.

Realized derivative gains receivables decreased by $0.3 million as of September 30, 2010 compared to December 31, 2009.

Net short-term unrealized derivative gains receivable increased by approximately $0.4 million as of September 30, 2010 compared to December 31, 2009.

Working capital, primarily cash and cash equivalents, is expected to increase during early 2011 due to the Partnership’s withholding cash from the investors for the initial Wattenberg Field well refracturing activities. Cash will begin to decrease as the funds are utilized in payment of the completed refracturing activities, currently planned to occur during mid-to-late 2011. Funding for the Well Refracturing Plan will be provided by the withholding of distributable cash flows from the Managing General Partner and Investor Partners on a pro-rata basis. Working capital is expected to similarly fluctuate by increasing during periods of Well Refracturing Plan funding and by decreasing during periods when payments are made for completed well refracturing.

Cash Flows

Cash Flows From Investing Activities

The Partnership, from time-to-time, invests in additional equipment which supports treatment, delivery and measurement of natural gas and oil or environmental protection. These amounts totaled approximately $16,000 and $4,000 for the nine months ended September 30, 2010 and 2009, respectively.

Cash Flows From Financing Activities

The Partnership initiated monthly cash distributions to investors in June 2005 and has distributed $37.2 million through September 30, 2010. The table below presents the cash distributions to the Managing General Partner and Investor Partners, including Managing General Partner distributions relating to limited partnership units repurchased, for the periods described.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Three months ended September 30,	Managing General Partner Distributions		Investor Partners Distributions		Total Distributions

2010	$	82,255	$	329,020	$	411,275

2009	$	363,656	$	1,454,627	$	1,818,283

Nine months ended September 30,	Managing General Partner Distributions		Investor Partners Distributions		Total Distributions

2010	$	446,080	$	1,784,317	$	2,230,397

2009	$	756,391	$	3,025,571	$	3,781,962

The Partnership began funding for the Well Refracturing Plan during October 2010. On a pro-rata basis based on percentage of ownership in the Partnership, the Partnership withheld $4,000 and $16,000 from the Managing General Partner and Investor Partners’ share, respectively, of distributable cash flows from the Partnership’s August 2010 natural gas and oil revenues distributed in October 2010. The October 2010 and subsequent withholdings will provide the funding for planned Wattenberg Field well refracturing costs to be incurred during 2011, and thereafter.

Cash Flows From Operating Activities

Net cash provided by operating activities was $2.3 million for the nine months ended September 30, 2010, compared to approximately $3.8 million for the comparable period in 2009. The approximately $1.5 million decrease in cash provided by operating activities was due primarily to the following:

An increase in natural gas and oil sales receipts of $0.3 million, or 14%, accompanied by a decrease in direct costs – general and administrative of $0.5 million, or 81%;

A decrease in commodity price risk management realized gains receipts of $1.3 million, or 62%;

A decrease in Due to Managing General Partner-other, net, receipts of approximately $1.0 million, excluding natural gas and oil sales received from third parties and realized derivative gains.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Commitments and Contingencies

See Note 6, Commitments and Contingencies, to the accompanying unaudited condensed financial statements, included in this report.

Recent Accounting Standards

See Note 2, Recent Accounting Standards to the accompanying unaudited condensed financial statements, included in this report.

Critical Accounting Policies and Estimates

The preparation of the accompanying unaudited condensed financial statements in conformity with U.S. GAAP requires management to use judgment in making estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities and the reported amounts of revenue and expenses.

There have been no other significant changes to the Partnership’s critical accounting policies and estimates or in the underlying accounting assumptions and estimates used in these critical accounting policies from those disclosed in the financial statements and accompanying notes contained in the Partnership’s 2009 Form 10-K, such policies include revenue recognition, derivatives instruments, fair value measurements, natural gas and oil properties, and asset retirement obligations are based on, among other things, judgments and assumptions made by management that include inherent risks and uncertainties.

Off-Balance Sheet Arrangements

Currently, the Partnership does not have any off-balance sheet arrangements.

Item 3.

Quantitative and Qualitative Disclosures About Market Risk

Not applicable.

Item 4.

Controls and Procedures

The Partnership has no direct management or officers. The management, officers and other employees that provide services on behalf of the Partnership are employed by the Managing General Partner.

(a) Evaluation of Disclosure Controls and Procedures

As of September 30, 2010, PDC, as Managing General Partner of the Partnership, carried out an evaluation under the supervision and with the participation of the Managing General Partner’s management, including the Chief Executive Officer and the Chief Financial Officer, of the effectiveness of the design and operation of the Partnership’s disclosure controls and procedures pursuant to Securities Exchange Act Rule 13a-15(e) and 15d-15(e). This evaluation considered the various processes carried out under the direction of the Managing General Partner’s Disclosure Committee in an effort to ensure that information required to be disclosed in the SEC reports that we file or submit under the Exchange Act are recorded, processed, summarized and reported within the time periods specified by the SEC’s rules and forms, and that such information is accumulated and communicated to the Partnership’s management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely discussion regarding required financial disclosure.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Based on the results of this evaluation, the Managing General Partner’s Chief Executive Officer and the Chief Financial Officer concluded that the Partnership’s disclosure controls and procedures were effective as of September 30, 2010.

(b) Changes in Internal Control over Financial Reporting

PDC, the Managing General Partner, made no changes in the Partnership’s internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) of the Securities Exchange Act of 1934) during the quarter ended September 30, 2010, that have materially affected or are reasonably likely to materially affect the Partnership’s internal control over financial reporting.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

PART II – OTHER INFORMATION

Item 1.

Legal Proceedings

Information regarding the Registrant’s legal proceedings can be found in Note 6, Commitments and Contingencies, to the Partnership’s accompanying unaudited condensed financial statements.

Item 1A.

Risk Factors

Not applicable.

Item 2.

UnregisteredSales of Equity Securities and Use of Proceeds

Unit Repurchase Program: Beginning June 2008, the third anniversary of the date of the first Partnership cash distributions, Investor Partners of the Partnership may request that the Managing General Partner repurchase their respective individual Investor Partner units, up to an aggregate total limit during any calendar year for all requesting Investor Partner unit repurchases of 10% of the initial subscription units. As of July 1, 2010, the Managing General Partner suspended the opportunity for an individual unaffiliated investor partner to request that PDC repurchase their respective limited partnership units under the terms of the program, pending the outcome of the proposed Merger Agreement. There were no limited partnership units repurchased by PDC for the three months ended September 30, 2010.

Item 3.

DefaultsUpon Senior Securities

Not applicable.

Item 4.

[Removed and Reserved]

Item 5.

Other Information

Not applicable.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Item 6.

Exhibits

(a) Exhibit Index.

			Incorporated by Reference
Exhibit Number	Exhibit Description	Form	SEC File Number	Exhibit	Filing Date	Filed Herewith
2.1	Agreement and Plan of Merger by and among PDC, DP 2004 Merger Sub, LLC and PDC 2004-D Limited Partnership	8-K	000-51221	2.1	06/09/2010

3.1	Limited Partnership Agreement	PREM14A	000-51221	Annex F	07/14/2010

3.2	Certificate of limited partnership which reflects the organization of the Partnership under West Virginia law	10-K	000-51221	3.2	08/05/2009

10.1	Drilling and operating agreement between the Partnership and PDC, as Managing General Partner of the Partnership	10-K	000-51221	10.1	08/05/2009

10.2	Form of assignment of leases to the Partnership	10-K	000-51221	10.2	08/05/2009

10.4	Gas Purchase and Processing Agreement between Duke Energy Field Services, Inc.; United States Exploration, Inc.; and Petroleum Development Corporation, dated October 28, 1999 (filed by PDC as Managing General Partner for Rockies Region 2007 Limited Partnership)	10-12G/A Amend 3	000-53201	10.3	03/31/2009

10.5	Gas Purchase and Processing Agreement between Natural Gas Associates, a Colorado partnership, and Aceite Energy Corporation, Walker Exploratory Program 1982-A Limited and Cattle Creek Company, dated October 14, 1983 (filed by PDC as Managing General Partner for Rockies Region 2007 Limited Partnership)	10-12G/A Amend 3	000-53201	10.4	03/31/2009

10.6	Gas Purchase and Processing Agreement between Natural Gas Associates, a Colorado partnership, and SHF Partnership, a Colorado general partnership, Trailblazer Oil and Gas, Inc., Alfa Resources, Inc., Pulsar Oil and Gas, Inc., Overthrust Oil Royalty Corporation, Corvette Petroleum Ltd., Robert Lanari, an individual, and Toby A Martinez, an individual, dated September 21, 1983 (filed by PDC as Managing General Partner for Rockies Region 2007 Limited Partnership)	10-12G/A Amend 3	000-53201	10.5	03/31/2009

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Incorporated by Reference

Exhibit Number

Exhibit Description

Form

SEC File Number

Exhibit

Filing Date

Filed Herewith

10.7

Domestic Crude Oil Purchase Agreement with ConocoPhillips Company, dated January 1, 1993, as amended by agreements with Teppco Crude Oil, LLC dated August 2, 2007; September 24, 2007; October 17, 2007; January 7, 2008; January 15, 2008; and April 17, 2008 (filed by PDC as Managing General Partner for Rockies Region 2007 Limited Partnership)

10-12G/A

Amend 3

000-53201

10.6

03/31/2009

10.8

Gas Purchase Agreement between Williams Production RMT Company, Riley Natural Gas Company and Petroleum Development Corporation, dated as of June 1, 2006 (filed by PDC as Managing General Partner for Rockies Region 2007 Limited Partnership)

10-12G/A

Amend 3

000-53201

10.7

03/31/2009

10.9

Domestic Crude Oil Purchase Agreement between Suncor Energy Marketing Inc. and Petroleum Development Corporation, dated April 22, 2008 (filed by PDC as Managing General Partner for Rockies Region 2007 Limited Partnership)

10-Q

000-53201

10.1

05/18/2009

31.1

Certification by Chief Executive Officer of Petroleum Development Corporation (dba PDC Energy), the Managing General Partner of the Partnership, pursuant to Rule 13a-14(a)/15d-14(c) of the Exchange Act Rules, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

Incorporated by Reference

Exhibit Number

Exhibit Description

Form

SEC File Number

Exhibit

Filing Date

Filed Herewith

31.2

Certification by Chief Financial Officer of Petroleum Development Corporation (dba PDC Energy), the Managing General Partner of the Partnership, pursuant to Rule 13a-14(a)/15d-14(c) of the Exchange Act Rules, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1

Certifications by Chief Executive Officer and Chief Financial Officer of Petroleum Development Corporation (dba PDC Energy), the Managing General Partner of the Partnership, pursuant to Title 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of Sarbanes-Oxley Act of 2002.

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Index

PDC 2004-D LIMITED PARTNERSHIP

(A West Virginia Limited Partnership)

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

PDC 2004-D Limited Partnership

By its Managing General Partner

Petroleum Development Corporation (dba PDC Energy)

By /s/ Richard W. McCullough

Richard W. McCullough

Chairman and Chief Executive Officer

of Petroleum Development Corporation (dba PDC Energy)

November 12, 2010

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the Registrant and in the capacities and on the dates indicated:

Signature	Title	Date

/s/ Richard W. McCullough	Chairman and Chief Executive Officer	November 12, 2010
Richard W. McCullough	Petroleum Development Corporation (dba PDC Energy)
	Managing General Partner of the Registrant
	(Principal executive officer)

/s/ Gysle R. Shellum	Chief Financial Officer	November 12, 2010
Gysle R. Shellum	Petroleum Development Corporation (dba PDC Energy)
	Managing General Partner of the Registrant
	(Principal financial officer)

/s/ R. Scott Meyers	Chief Accounting Officer	November 12, 2010
R. Scott Meyers	Petroleum Development Corporation (dba PDC Energy)
	Managing General Partner of the Registrant
	(Principal accounting officer)

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PDC 2004-D Limited Partnership 10-Q