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Description of business and nature of operations (Details)
3 Months Ended
Jul. 01, 2021
shares
Oct. 02, 2020
USD ($)
$ / shares
shares
Jan. 16, 2020
shares
Dec. 31, 2019
Sep. 30, 2021
item
subsidiary
Number of subsidiaries | subsidiary         1
Percentage of increase in sales of electric vehicles       40.00%  
Operation dates delayed number of chargers covid | item         400
Class A Common Stock          
Conversion ratio 1        
Class B Common Stock          
Units issued (in shares)     195,800,000    
Conversion ratio 1        
EVgo OpCo          
Units issued (in shares) 195,800,000   195,800,000    
Post-transaction ownership percentage of the target business 74.00%        
Climate Change Crisis Real Impact I Acquisition Corporation [Member]          
Sale of stock percentage of ownership after transaction 26.00%        
Private Placement Warrants          
Warrants issued (in shares)   6,600,000      
Initial Public Offering [Member]          
Gross proceeds | $   $ 230,000,000      
Initial Public Offering [Member] | Public Shares [Member]          
Units issued (in shares)   23,000,000      
Unit price (in dollars per share) | $ / shares   $ 10.00      
Gross proceeds | $   $ 6,600,000      
Over-Allotment Option [Member] | Public Shares [Member]          
Units issued (in shares)   3,000,000      
Unit price (in dollars per share) | $ / shares   $ 1.00