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Electric and Water Systems
Santee Cooper generates electricity

from four large base load facilities located across South Carolina, as well as from supplemental hydroelectric, peaking and renewable generating stations. The base load generation comes from Cross Generating Station in Berkeley County, Winyah Generating Station in Georgetown County, V.C. Summer Nuclear Station in Fairfield County, and Rainey Generating Station in Anderson County. 


> On Feb. 17, 1942, Jefferies Hydroelectric Station officially turned its first turbine for the first time. It represented the start of Santee Cooper’s electricity generation. Some 75 years later, Jefferies’ hydro units are still powering our customers. We refurbished two units in early 2017, achieving a 20 percent increase in generating capability in the process.

> Today we provide electricity from a mix of resources that includes hydro, coal, nuclear, natural gas and renewable resources. Santee Cooper effectively manages generation based on the most economic sources in order to provide reliable electricity to 2 million South Carolinians.

> We provided South Carolina electric customers with the first renewable generation in the state, in 2001, using methane gas generated naturally in landfills. We also introduced solar and wind power to the state’s grid, and we brought the first utility-scale solar farm to South Carolina.

Rainey Generating Station

> Our units perform: in 2013, Unit 1A at Rainey Generating Station ran for more hours than any other natural gas generating unit in the country, indicating the high quality of Santee Cooper’s workforce and maintenance processes.

> With Santee Cooper’s leadership, The Energy Authority was formed in 1997 as the nation’s first public power marketing alliance. TEA continues to provide Santee Cooper and its other members with the ability to buy and sell power daily. That helps us better use Santee Cooper’s generating resources, which saves customers money.

> Our commitment to the use of emissions-reducing technology goes way back: Santee Cooper installed South Carolina’s first coal-unit scrubber, in the 1970s, at Winyah Generating Station.

> We have retired our oldest fossil stations. The existing fleet of coal units is fully equipped with environmental control technology that meets or exceeds federal and state regulations.

Diverse generation portfolio

> Just 10 years ago, 81 percent of our generation came from one fuel source: coal. As environmental regulations and transportation challenges increased the price of coal, Santee Cooper worked to diversify our generation portfolio. That lets us save customers money by using the most cost-effective generation on any given day. 

> In 2015 and 2016, about 50 percent of Santee Cooper’s generation came from coal units. In that same time period, we increased the use of our own natural gas units and purchased supplemental, low-priced natural gas-fueled generation. 

> Green Power is a part of Santee Cooper’s renewable generation portfolio, which has 106 MW online or under contract including landfill gas, solar, wind and biomass.

Santee Cooper introduced Green Power to the state grid in 2001, with the opening of the state’s first Green Power Generating Station at the Horry County Landfill. Today, there are six landfill-based Green Power stations. These stations capture methane gas, a potent greenhouse gas, and turn it into electricity. 


Santee Cooper operates the Santee Cooper Regional Water System on Lake Moultrie and the Lake Marion Regional Water System, two modern water treatment systems serving nearly 200,000 people, with plenty of room to grow. 

Lake Moultrie System
Launched on Oct. 1, 1994, the Santee Cooper Regional Water System expanded in 2017 by increasing capacity to 40 million gallons per day.

> The water system reflects a landmark partnership between multiple local jurisdictions and is a role model for public entity cooperation.


“Nothing has been more important to the development of our community than this water system.” 

- City of Goose Creek Mayor Michael Heitzler


> The water system serves the Lake Moultrie Water Agency and its four members – Berkeley County Water and Sanitation, City of Goose Creek, Summerville Commissioners of Public Works and Moncks Corner Public Works Commission.

> The water system serves the Volvo plant - one of the largest industrial assets in the state and Berkeley County.

> The system was declared ‘Best Tasting Water’ by the South Carolina Rura Water Association.

An interior view of the Lake Marion Regional Water System.

Lake Marion System

The Lake Marion Regional Water System opened in May 2008 and is heralded for bringing clean, safe and reliable drinking water to counties along I-95, including some of the state’s poorest and most rural communities.

> The water system serves the Lake Marion Regional Water Agency and currently provides water to three agency members – Town of Santee, Calhoun County and Orangeburg County. Other members include Dorchester County and Berkeley County Water and Sanitation, which are served by system expansions. 

> The system was also declared ‘Best Tasting Water’ by the South Carolina Rural Water Association.


“This is a tremendous day for the communities…that will ultimately benefit from the clean, safe drinking water this project will provide. Access to potable water is also a key component to attracting economic development to the I-95 corridor.”

- U.S. Representative James Clyburn