UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~August~~March 713, ~~2025~~2026

Public Service Company of Colorado

(Exact name of registrant as specified in its charter)

Colorado

001-03280

84-0296600

(State or other jurisdiction

of incorporation)

(Commission

File Number)

(IRS Employer

Identification No.)

3500 Blake Street

Denver, Colorado

80205

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code (303) 571-7511

N/A

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐

Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐

Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐

Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐

Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange

on which registered

N/A

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01.

Other Events.

On ~~August~~March 713, ~~2025~~2026, Public Service Company of Colorado, a Colorado corporation (“PSCo”), issued $~~200~~700,000,000 in aggregate principal amount of 54.8515% First Mortgage Bonds, Series No. 4345 due ~~May~~March 1513, ~~2055~~2029 (the “~~2055~~2029 Bonds”) and $~~800~~600,000,000 in aggregate principal amount of 5.1505% First Mortgage Bonds, Series No. 4446 due ~~September~~June 15, ~~2035~~2036 (the “~~2035~~2036 Bonds,” and, together with the ~~2055~~2029 Bonds, the “Bonds”), pursuant to an Underwriting Agreement among PSCo and ~~Barclays Capital Inc.,~~ BNY Mellon Capital Markets, LLC, ~~Citigroup~~CIBC ~~Global~~World Markets ~~Inc~~Corp., ~~Huntington~~J.P. Morgan Securities LLC, Scotia Capital (USA) Inc., and ~~Truist~~TD Securities, ~~Inc.~~(USA) LLC, as representatives of the underwriters named therein. The Bonds are being issued pursuant to the registration statement on Form S-3 (File No. 333-278797-02) (the “Registration Statement”). The 2055 Bonds will form a part of the series of the Company’s 5.85% First Mortgage Bonds, Series No. 43 due 2055 (the “Existing 2055 Bonds”) and have the same terms, other than their date of issue and initial price to the public, as the $600,000,000 aggregate principal amount of Existing 2055 Bonds issued by the Company on March 20, 2025. A prospectus supplement relating to the offering and sale of the Bonds was filed with the Securities and Exchange Commission on ~~August~~March 511, ~~2025~~2026. The ~~2055~~ Bonds will be governed by the Indenture, dated October 1, 1993, by and between PSCo and U.S. Bank Trust Company, National Association, as successor trustee (the “Original Indenture”), as further supplemented by Supplemental Indenture No. 3638, dated as of March 1, ~~2025~~2026. ~~The 2035 Bonds will be governed by the Original Indenture, as further supplemented by Supplemental Indenture No. 37 dated as of August 1, 2025.~~

This Current Report on Form 8-K is being filed to report as exhibits certain documents in connection with that offering and sale for incorporation by reference into the Registration Statement.

Item 9.01.

Financial Statements and Exhibits.

(d) Exhibits.

Exhibit		Description
4.01		Indenture, dated as of October 1, 1993, between Public Service Company of Colorado and U.S. Bank Trust Company, National Association as successor Trustee (incorporated by reference to an Annual Report on Form 10-K filed by PSCo on February 27, 2025 (file no. 001-03280).
4.02		Supplemental Indenture No. 3638 dated as of March 1, ~~2025~~2026, between Public Service Company of Colorado and U.S. Bank Trust Company, National Association, as successor Trustee, creating ~~the 5.85% First Mortgage Bonds, Series No. 43 due 2055 and governing~~ $~~600~~700,000,000 aggregate principal amount of ~~the~~4.15% ~~Existing~~First ~~2055~~Mortgage Bonds, ~~issued~~Series onNo. 45 due March 2013, ~~2025~~2029 and ~~an additional~~ $~~200~~600,000,000 aggregate principal amount of ~~the~~5.05% ~~2055~~First ~~Bonds~~Mortgage ~~issued on August 7~~Bonds, ~~2025~~Series ~~(incorporated~~No. by46 ~~reference~~due toJune ~~a Current Report on Form 8-K filed by PSCo on March 20~~15, ~~2025, file no~~2036. ~~001-03280).~~
4.03		Supplemental Indenture No. 37 dated as of August 1, 2025, between Public Service Company of Colorado and U.S. Bank Trust Company, National Association, as successor Trustee, creating $800,000,000 million principal amount of 5.15% First Mortgage Bonds, Series No. 44 due 2035.
5.01		Opinion of Faegre Drinker Biddle & Reath LLP regarding the validity of certain securities.
104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

August 7, 2025

Public Service Company of Colorado (a Colorado corporation)

March 13, 2026

Public Service Company of Colorado (a Colorado corporation)

/s/ Todd A. Wehner

Name: Todd A. Wehner

Title: Vice President, Treasurer

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