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Tennessee Valley Authority (TVA)

Building our Energy Future

More to ‘pumped storage’ than meets the eye

By Lydia Graves - Appalachian Voices, February 7, 2018

Dominion Energy has been eyeing far Southwest Virginia for its latest project — a giant, hydroelectric battery, also called pumped storage. The facility would use cheap or excess power to pump water into an elevated reservoir during off-peak hours. By holding the water until peak demand hours and releasing it to run turbines when energy is needed the most, electricity is effectively captured and stored.

Although using energy to pump water uphill may sound counterintuitive, this project could be a way to make our power usage more efficient. Often, pumped storage facilities reduce energy waste by using excess energy from coal or nuclear facilities, so-called baseload plants that generate the same amount of power around the clock. The world’s largest pumped storage facility is in Bath County, Virginia, and is owned by Dominion.

Local solar is best

It is critical that any project Dominion constructs in Southwest Virginia benefits local people directly by generating the power onsite using cost-effective solar, drawing from the existing workforce and maximizing local economic impacts. The two potential projects Dominion is considering in the coalfield counties are forecasted to be roughly ten times smaller than the 3,003-megawatt Bath County site, so using small, onsite solar installations would be appropriate.

Solar is now the cheapest form energy generation worldwide and employs more people in the U.S. than coal, gas and oil electrical generation combined. Solar panels at the proposed pumped storage facility would capture and store the sun’s energy until the power is needed most by customers.

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