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Our goal is to use less water and to reuse water at our electric generation facilities, where the greatest amount of water is used to produce power. We are also actively working to reduce water in other areas of our business.
Our most recently constructed natural gas facilities (Warren County Power Station, Brunswick County Power Station, Greensville Power Station), one coal facility, Virginia City Hybrid Energy Center, and one older natural gas unit, Gordonsville, all use air-cooled condensers. Air-cooled condensers utilize significantly less water than once-through cooling systems and traditional wet cooling towers. The heat is released directly into the air instead of heating or evaporating water withdrawn from a natural source.
Produced Water Evaporator
In May and June of 2018, Dominion Energy Wexpro installed a produced water treatment system at the Canyon Creek Unit Produced Water Evaporation Facility. This system will allow an estimated 21 million gallons of produced water — water that is brought to the surface during the production of natural gas — to be reused over the next five years at Canyon Creek and operations in Wyoming. That change will eliminate an estimated 2,500 truck trips per year at an annual savings to customers of $1 million.
Millstone Power Station
In the spring of 2018, Millstone Power Station reduced cooling water withdrawals by 33 percent through the use of adjustable electronic-control technology. By reducing the amount of water drawn into the cooling system, the station reduced impacts on winter flounder larvae.
Warren County Power Station
Our Warren County Power Station estimates it will save 2.6 million gallons of water a year, as well as $60,000 annually on water purchases, thanks to a 2018 project. Historically, steam blowdown sump pumps had cooling water running continuously. This cooling water is service water provided by a local municipality. With a few upgrades to the equipment design, water is now used only when the pumps are operating.
Hopewell Power Station
In 2018, a creative group of employees at Hopewell Power Station designed and implemented a water reuse project to recycle cooling water. In the first six months of operation, the new recycling system saved nearly 12 million gallons of water in addition to over $29,000 in cost savings on water purchases.