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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2025
May 01, 2025
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Mar. 31, 2025  
Document Fiscal Year Focus 2025  
Securities Act File Number 001-33480  
Entity Registrant Name CLEAN ENERGY FUELS CORP.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-0968580  
Entity Address, Address Line One 4675 MacArthur Court  
Entity Address, Address Line Two Suite 800  
Entity Address, City or Town Newport Beach  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 92660  
City Area Code 949  
Local Phone Number 437-1000  
Title of 12(b) Security Common stock, $0.0001 par value per share  
Trading Symbol CLNE  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding (in shares)   220,981,915
Entity Central Index Key 0001368265  
Current Fiscal Year End Date --12-31  
Document Fiscal Period Focus Q1  
Amendment Flag false