Document And Entity Information - USD ($) $ in Millions	12 Months Ended
Document And Entity Information - USD ($) $ in Millions	Dec. 31, 2025	Apr. 28, 2026	Jun. 30, 2025
Document Information Line Items
Entity Central Index Key	0001992243
Document Type	10-K/A
Document Annual Report	true
Current Fiscal Year End Date	--12-31
Document Period End Date	Dec. 31, 2025
Document Fiscal Year Focus	2025
Document Transition Report	false
Entity File Number	001-41903
Entity Registrant Name	T1 Energy Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	93-3205861
Entity Address, Address Line One	1211 E 4th St.
Entity Address, City or Town	Austin
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78702
City Area Code	(409)
Local Phone Number	599-5706
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 141
Entity Common Stock, Shares Outstanding		279,071,590
Amendment Description	This Amendment No. 1 (the “Amendment”) on Form 10-K/A is being filed with respect to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the Securities and Exchange Commission (the “SEC”) on March 31, 2026 (the “Original Filing”). The Company is filing this Amendment to present the information required by Part III (Items 10, 11, 12, 13 and 14) of Form 10-K, which was previously omitted from the Original Filing in reliance on General Instruction G(3) to Form 10-K. The reference on the cover page of the Original Filing to incorporation by reference of certain information from our proxy statement into Part III of the Original Filing has been deleted. In addition, Part IV, Item 15 (Exhibit Index) has also been amended to contain currently dated certifications of our principal executive officer and principal financial officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. Because no financial statements are contained within this Amendment, the Company is not including certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.Except as otherwise expressly set forth herein, this Amendment (i) does not amend or otherwise update any other information in the Original Filing, (ii) does not reflect events occurring after the date of the Original Filing or (iii) modify or update those disclosures that may have been affected by subsequent events. Accordingly, this Amendment should be read in conjunction with the Original Filing and with our filings with the SEC subsequent to the Original Filing.The terms “T1,” “T1 Energy,” “Company,” “we,” “us,” and “our” in this document refer to T1 Energy Inc., a Delaware corporation, and, where appropriate, its subsidiaries. Capitalized terms not otherwise defined in Part III of this Amendment shall have the same meanings assigned to those terms in the Original Filing.
Amendment Flag	true
Document Fiscal Period Focus	FY
Common Stock, $0.01 par value
Document Information Line Items
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	TE
Security Exchange Name	NYSE
Warrants, each whole warrant exercisable for one Common Stock at an exercise price of $11.50
Document Information Line Items
Title of 12(b) Security	Warrants, each whole warrant exercisable for one Common Stock at an exercise price of $11.50
Trading Symbol	TE WS
Security Exchange Name	NYSE

T1 Energy Inc. 10-K/A