STP Nuclear Operating Company manages the plant for its owners, who share its energy in proportion to their ownership interest:
•Austin Energy, 16 percent
•CPS Energy, 40 percent
•NRG Energy, Inc., 44 percent
The plant is located about 90 miles southwest of Houston, near Bay City. STP's reactors went online in August 1988 and June 1989, and are the sixth and fourth youngest, respectively, of the 104 operating nationwide.