| Document and Entity Information | Sep. 07, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 7, 2021 |
| Entity File Number | 001-39572 |
| Entity Registrant Name | EVgo Inc. |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 85-2326098 |
| Entity Address, Address Line One | 11835 West Olympic Boulevard |
| Entity Address, Adress Line Two | Suite 900E |
| Entity Address, City or Town | Los Angeles |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 90064 |
| City Area Code | 877 |
| Local Phone Number | 494-3833 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | false |
| Entity Central Index Key | 0001821159 |
| Amendment Flag | false |
| Common Class A [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Shares of Class A common stock, $0.0001 par value |
| Trading Symbol | EVGO |
| Security Exchange Name | NASDAQ |
| Redeemable Warrants for Class A Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Redeemable warrants, each whole warrant exercisable for one share of Class A common stock at an exercise price of $11.50 |
| Trading Symbol | EVGOW |
| Security Exchange Name | NASDAQ |
