Related party transactions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Receivable from related party			$ 1,500
Payables to related parties	$ 25
Revenue	7,700	$ 3,569
Entities Controlled by LS Power [Member] \| Regulatory Credit Sales [Member]
Revenue	0	600
LS Power Equity Advisors, LLC [[Member] \| Consulting And Corporate Development Services [Member] \| General and Administrative Expense [Member]
Fee for services	0	$ 700
EVgo Holdings [Member]
Receivable from related party			$ 1,500
EVgo Holdings and EVgo Management Holdings, LLC [Member]
Payables to related parties	$ 25

Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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