v3.26.1
COVER - shares
 3 Months Ended
Mar. 31, 2026
Jun. 17, 2026
Document Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-43285  
Registrant Name Fervo Energy Co  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 82-3168838  
Entity Address, Address Line One 811 Main Street  
Entity Address, Address Line Two Suite 1700  
Entity Address, City or Town Houston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77002  
City Area Code 832  
Local Phone Number 554-3253  
Title of 12(b) Security Class A Common Stock, par value $0.0001 per share  
Trading Symbol FRVO  
Security Exchange Name NASDAQ  
Entity Current Reporting Status 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 false  
Central Index Key 0001853868  
Amendment Flag false  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2026  
Current Fiscal Year End Date --12-31  
Class A common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   286,859,562
Class B common stock    
Document Information [Line Items]    
Entity Common Stock, Shares Outstanding   7,785,412