Number of years for energy credit carryforward?

[Greta]

Client wants to take the 26% solar credit in 2022 but has no tax liability. How many years does the carryforward last?

[sjrcpa · Accepted solution]

IRC §25D(c)

Indefinite

[HOPE2]

Thanks, if client installed solar in 2020, how long it can be expanded unused credit? Two or 5 years?