SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation Our unaudited condensed consolidated interim financial statements have been prepared in conformity with the accounting principles generally accepted in the U.S. (“U.S. GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of U.S. Securities and Exchange Commission (“SEC”) Regulation S-X. Accordingly, these financial statements do not include all of the information required by U.S. GAAP for complete consolidated financial statements. Our unaudited condensed consolidated interim financial statements have been prepared on the same basis as the audited annual consolidated financial statements for the year ended December 31, 2025 and, in management’s opinion, include all adjustments, consisting of only normal recurring adjustments necessary for the fair statement of our unaudited condensed consolidated financial statements for the periods presented. The results of operations for the three months ended March 31, 2026, are not necessarily indicative of the results to be expected for the full year ending December 31, 2026. Our unaudited condensed consolidated balance sheet as of December 31, 2025, was derived from the audited consolidated financial statements as of December 31, 2025. However, these unaudited condensed consolidated interim financial statements do not contain all of the footnote disclosures required in annual consolidated financial statements. These unaudited condensed consolidated interim financial statements should be read in conjunction with the audited consolidated financial statements and the related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2025 filed with the SEC on March 31, 2026, as amended and supplemented by Amendment No. 1 on Form 10-K/A filed with the SEC on April 30, 2026. Our unaudited condensed consolidated financial statements include the accounts of T1, its wholly owned subsidiaries, majority-owned subsidiaries, and variable interest entities (“VIEs”) of which we are the primary beneficiary. All intercompany accounts and transactions have been eliminated. Certain prior period balances and amounts have been reclassified to conform with the current year’s presentation in our unaudited condensed consolidated financial statements and the accompanying notes.
Assets Held for Sale and Discontinued Operations	Assets Held for Sale and Discontinued Operations During the year ended December 31, 2025, certain amounts related to our European businesses that had previously been classified as held for sale as of December 31, 2024 were reclassified to held and used as it was determined that certain assets were no longer available for immediate sale or would be disposed of by means other than a sale and thus no longer met the criteria for classification as held for sale. There were no reclassifications as of and for the three months ended March 31, 2026.
Use of Estimates	Use of Estimates The preparation of unaudited condensed consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported in the unaudited condensed consolidated financial statements and accompanying notes. Estimates and assumptions include, but are not limited to, estimates related to the fair value less costs to sell for assets held for sale, impairment of long-lived assets, purchase price allocation adjustments, the valuation of warrant liabilities, anti-dilution right and share-based compensation. We base these estimates on historical experiences and on various other assumptions that we believe are reasonable under the circumstances, however, actual results may differ materially from these estimates.
Concentrations of Risks	Concentration of Risks Customer Concentration Risk One customer accounted for approximately 100% of our total net sales for the three months ended March 31, 2026 and 2025 and 100% of our aggregate trade accounts receivable, net as of March 31, 2026 and December 31, 2025. We are substantially dependent on a single customer, and the loss of this significant customer could have a material adverse effect on the Company’s results of operations and financial condition. Refer to Note 13 – Related Party Transactions for further details. Supplier Concentration Risk Several of our key raw materials, components, and manufacturing equipment are sourced from highly specialized suppliers. The failure of any key supplier to perform could disrupt our supply chain and impair our ability to deliver PV solar modules to customers in the required quality, quantities, and pricing, which could adversely affect our results of operations. Production Concentration Risk Our PV solar modules are currently produced at a single facility in the United States. Shortages of essential components or equipment due to increased demand, supply interruptions, or limited logistics availability could adversely affect our ability to meet customer demand. Damage to, or disruption of, this facility could interrupt operations and negatively impact our ability to generate net sales. Concentrations of Credit Risk Financial instruments that are potentially subject to credit risk consist of cash and cash equivalents and restricted cash. Our cash and cash equivalents and restricted cash are placed with major financial institutions. We have not experienced any credit loss related to our cash and cash equivalents and restricted cash.
Allowances for Credit Losses	Allowance for Credit Losses As of March 31, 2026 and December 31, 2025, we recorded an allowance for credit losses of $5.6 million and $5.6 million, respectively, related to trade accounts receivable.
Deferred Revenue	Deferred Revenue During the three months ended March 31, 2026 and 2025, we recognized revenue related to deliveries of PV solar modules of $52.2 million and $31.8 million, respectively, that was included in deferred revenue at the beginning of each respective period.
Revenue Recognition - Module Sales	Revenue Recognition – Module Sales Substantially all of our revenues are from sales in the United States. As of March 31, 2026, we had entered into contracts with customers for the future sale of 2.3 gigawatts of PV solar modules. We expect to recognize sales of 2.3 gigawatts of PV solar modules in 2026, with incremental sales of 1.0 gigawatts of PV solar modules in subsequent years through 2029 for these contracts as we transfer control of the PV solar modules to the customer. These contracts are generally priced on a per-watt basis, subject to true-up adjustments, and require prepayment of 50% of the forecasted purchase price prior to the start of each quarter, with the remaining 50% due under customary 30-day payment terms upon transfer of control. These contracts may also be subject to amendments as agreed to by the parties to the contracts which may increase or decrease the volume of the PV solar modules or change delivery schedules.
Equity Investments Without Readily Determinable Fair Values	Equity Investments Without Readily Determinable Fair Values In October 2025, the Company entered into a Simple Agreement for Future Equity (“SAFE”) with a privately held company, Talon PV, LLC (the “Issuer”). Under the terms of the SAFE, the Company provided $5.0 million in cash in exchange for the right to receive equity in the Issuer upon the occurrence of certain future events, including a qualified equity financing, liquidity event, or dissolution event. The Company evaluated the terms of the SAFE, and concluded the SAFE represents an equity interest in a privately held entity without a readily determinable fair value.
Interest Rate Swaps	Interest Rate Swaps The Company uses certain interest rate swap agreements to manage exposure to variability in cash flows arising from changes in interest rates on its variable‑rate debt obligations. These instruments are accounted for as derivative assets or liabilities in accordance with Accounting Standards Codification (“ASC”) 815 and recorded in the consolidated balance sheets at fair value, with changes in fair value recognized in earnings.
Adoption of Accounting Pronouncements and Future Adoption Of New Accounting Pronouncements	Adoption of Accounting Pronouncements In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-04, Debt—Debt with Conversion and Other Options. This standard provides guidance on the accounting treatment for induced conversions of convertible debt. Companies must recognize and measure the impact of incentives offered to induce early conversion of convertible debt separately from existing debt liability. For public business entities, the ASU is effective for fiscal years beginning after December 15, 2025, with early adoption permitted. We adopted this standard on January 1, 2026 and determined there was no impact on our unaudited condensed consolidated financial statements. In July 2025, the FASB issued ASU 2025-05, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets, to address challenges encountered when applying the guidance in Topic 326 to current accounts receivable and current contract assets arising from transactions accounted for under Topic 606. This standard introduces a practical expedient for entities that assumes that current conditions as of the balance sheet date do not change for the remaining life of the asset. This standard is effective for annual periods, including interim reporting periods within annual reporting periods, beginning after December 15, 2025, with early adoption permitted. We adopted this standard on January 1, 2026 and determined there was no impact on our unaudited condensed consolidated financial statements. Future Adoption of New Accounting Pronouncements In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which requires disclosure of disaggregated information about specific categories underlying certain income statement expense line items in the footnotes to the financial statements for both annual and interim periods. This ASU is effective for fiscal years beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted. This standard only modifies disclosure requirements; as such, we do not expect the adoption of this standard to result in a material impact on our consolidated statements of operations and comprehensive loss, balance sheet or cash flows. We are currently evaluating the effect of the adoption of this standard on our unaudited condensed consolidated financial statements and related disclosures. In December 2025, the FASB issued ASU 2025-10, Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities, to establish guidance on the recognition, measurement, and presentation of government grants received by business entities, which largely codifies our current approach to accounting for such grants. ASU 2025-10 is effective for public companies for annual reporting periods beginning after December 15, 2028 and interim reporting periods within those annual reporting periods. Early adoption is permitted. The guidance can be applied on a modified prospective basis, a modified retrospective basis, or a full retrospective basis. We are currently evaluating these options. We are currently evaluating the effect of the adoption of this standard on our unaudited condensed consolidated financial statements and related disclosures and do not expect this ASU to have a material impact. In December 2025, the FASB issued ASU 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements. The ASU clarifies interim disclosure requirements and the applicability of Topic 270. The objective of the amendments is to provide further clarity about the current interim disclosure requirements. The ASU is effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. Adoption of this ASU can be applied either on a prospective or a retrospective approach. Early adoption is permitted. We are currently evaluating the effect of the adoption of this standard on our unaudited condensed consolidated financial statements and related disclosures and do not expect this ASU to have a material impact. In March 2025, the FASB issued ASU 2025‑12, Codification Improvements, which includes various narrow amendments to clarify guidance, correct inconsistencies, and enhance the overall usability of the FASB Accounting Standards Codification (“ASC”). The amendments span multiple Topics, including earnings per share, leases, beneficial interests, transfers and servicing, and equity transactions, among others. The standard does not introduce new accounting models and is not expected to result in significant changes to current accounting practices for most entities. ASU 2025‑12 is effective for fiscal years beginning after December 15, 2026, including interim periods within those fiscal years. Amendments related to earnings per share must be applied retrospectively, while all other amendments may be applied either prospectively or retrospectively. Early adoption is permitted. We are currently evaluating the effect of the adoption of this standard on our unaudited condensed consolidated financial statements and related disclosures.

T1 Energy Inc. 10-Q