v3.26.1
Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Mar. 18, 2026
Jun. 30, 2025
Document Information [Line Items]        
Document Type 10-K      
Amendment Flag false      
Document Period End Date Dec. 31, 2025      
Document Fiscal Year Focus 2025      
Document Fiscal Period Focus FY      
Current Fiscal Year End Date --12-31      
Document Annual Report true      
Document Transition Report false      
Entity Registrant Name ALTENERGY ACQUISITION CORP.      
Entity Central Index Key 0001852016      
Entity File Number 001-40984      
Entity Tax Identification Number 84-2157013      
Entity Current Reporting Status Yes      
Entity Well-known Seasoned Issuer No      
Entity Voluntary Filers No      
Entity Interactive Data Current Yes      
Entity Filer Category Non-accelerated Filer      
Entity Small Business true      
Entity Emerging Growth Company true      
Entity Ex Transition Period false      
Entity Shell Company true      
Entity Incorporation, State or Country Code DE      
Entity Address, Address Line One 600 Lexington Avenue      
Entity Address, Address Line Two 9th Floor      
Entity Address, City or Town New York      
Entity Address, State or Province NY      
Entity Address, Postal Zip Code 10022      
City Area Code 203      
Local Phone Number 299-1400      
Entity Public Float       $ 5,998,158
Auditor Name CBIZ CPAs P.C. Marcum LLP    
Auditor Firm ID 199 688    
Auditor Location New York, NY New York, NY    
ICFR Auditor Attestation Flag false      
Document Financial Statement Error Correction [Flag] false      
Capital Units [Member]        
Document Information [Line Items]        
Title of 12(b) Security Units, each consisting of one share of Class A common stock and one-half of one redeemable warrant      
Trading Symbol AEAEU      
Security Exchange Name NONE      
Common Class A [Member]        
Document Information [Line Items]        
Title of 12(b) Security Class A common stock, par value $0.0001 per share      
Trading Symbol AEAE      
Security Exchange Name NONE      
Entity Common Stock, Shares Outstanding     6,016,197  
Warrant [Member]        
Document Information [Line Items]        
Title of 12(b) Security Warrants, each whole warrant exercisable for one share of Class A common stock, each at an exercise price of $11.50 per share      
Trading Symbol AEAEW      
Security Exchange Name NONE      
Common Class B [Member]        
Document Information [Line Items]        
Entity Common Stock, Shares Outstanding     250,000