Redeemable noncontrolling interest - Narrative (Details) - EVgo OpCo	3 Months Ended
Mar. 31, 2022 shares
Units Issued During Period, Shares, New Issues	195,800,000
Post-transaction ownership percentage of the target business	73.90%
Class B Common Stock [Member]
Post transaction voting interest percentage of the target business	73.90%

Post-transaction ownership percentage of the outstanding voting securities of the target business or assets sufficient for it not to be required to register as an investment company under the Investment Company Act of 1940.

No definition available.

Name:	evgo_PostTransactionOwnershipPercentageOfTheTargetBusiness
Namespace Prefix:	evgo_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration