X0206 3 2021-03-04 1 0001842883 First Reserve Sustainable Growth Corp. FRSG 0001849391 Amburgey Thomas S FIRST RESERVE SUSTAINABLE GROWTH CORP. 290 HARBOR DRIVE, FIFTH FLOOR STAMFORD CT 06902 1 1 0 0 Chief Financial Officer Exhibit 24 - Power of Attorney The reporting person has an indirect pecuniary interest in shares of Class B common stock, par value $0.0001 per share, of First Reserve Sustainable Growth Corp. through his membership interests in First Reserve Sustainable Growth Sponsor LLC, over which the reporting person does not have voting or dispositive control. /s/ Thomas S. Amburgey, by Neil A. Wizel as Attorney-in-Fact 2021-03-04