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Santee-Cooper : P-199
- Santee River, Cooper River
- SC, SC
- 134.52 MW
- SOUTH CAROLINA PUBLIC SERVICE AUTH
The Santee-Cooper hydropower project is located in Southeast South Carolina within Berkeley, Calhoun, Clarendon, Orangeburg, and Sumter counties. It is operated by South Carolina’s state owned electric and water utility, Santee-Cooper Public Service Authority.
Construction was completed in the late 1930s, and the project started generating electricity on February 17, 1942. It consists of two reservoirs. The upper reservoir, Lake Marion, is formed by the Santee Dam on the Santee River. It is the largest lake in South Carolina with a shoreline of 315 miles inundating over 110,000 acres. The lower reservoir, Lake Moultrie, is formed by Pinopolis Dam on a diversion canal from Lake Marion within the Cooper River drainage. The project diverted nearly all the water from the Santee River into the Cooper River. In total, the project flooded over 177,000 acres of land, from which 200,000,000 board feet of timber was removed. At the time, it was the largest land clearing project in the nation.
Although the Santee-Cooper project is one of the largest of its kind on the east coast, it produces relatively little electricity. The eight mile long Santee Dam facility has the capacity to produce only 1.92 megawatts of electricity. The Pinopolis Dam facility stretches approximately four miles in length and contains five turbines that generate 116 megawatts of electricity.
By diverting the majority of water from the Santee River, one of the largest on the Eastern seaboard, to the small tidal Cooper River, the Santee-Cooper project virtually eliminated the lower 90 miles of the Santee River and transformed the Cooper River into a major freshwater river. Although a re-diversion canal was constructed in the early 1980s, allowing 80% of the water entering Lake Moultrie to be redirected back to the Santee River, these flows are not dependable and are based on hydroelectric needs, not on the needs of the Santee River ecosystem.