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Description of business and nature of operations (Details) - USD ($)
Jul. 01, 2021
Oct. 02, 2020
Mar. 31, 2023
Class A Common Stock [Member]      
Conversion ratio 1    
Class B Common Stock [Member]      
Conversion ratio 1    
EVgo OpCo      
Units owned     195,800,000
Post-transaction ownership percentage of the target business     73.20%
Private Placement Warrants [Member] | Climate Change Crisis Real Impact I Acquisition Corporation [Member]      
Warrants issued (in shares)   6,600,000  
Unit price (in dollars per share)   $ 1.00  
Gross proceeds   $ 6,600,000  
Thunder Sub [Member] | Climate Change Crisis Real Impact I Acquisition Corporation [Member]      
Sale of stock percentage of ownership after transaction     26.80%