Andritz Hydro Corp., Charlotte, North Carolina, was awarded a $9,207,080 firm-fixed-price contract to rewind two hydroelectric generating units at Keystone Powerhouse. Bids were solicited via the internet with five received. Work will be performed in Sand Springs, Oklahoma, with an estimated completion date of June 1, 2023. Fiscal 2021 operation and maintenance, Army funds in the amount of $9,207,080 were obligated at the time of the award. U.S. Army Corps of Engineers, Tulsa, Oklahoma, is the contracting activity (W912BV-21-C-0007).