Analysis by the U.S. Energy Information Administration, 36% of the electricity generated in Virginia was produced by the four nuclear reactors at North Anna and Surry. Nuclear reactors total just 15% of the potential generating sources in Virginia, but produce 35-40% of the state’s electricity. Unlike other intermittent sources, the reactors at Surry and North Anna run continuously.
Top Renewables: Pumped Storage Hydro
The Bath County Pumped Storage Station is a pumped storage hydroelectric power plant, which is described as the “largest battery in the world”, with a generation capacity of 3,003 MW. The station is located in the northern corner of Bath County, Virginia, on the southeast side of the Eastern Continental Divide, which forms this section of the border between Virginia and West Virginia. The station consists of two reservoirs separated by about 1,260 feet (380 m) in elevation. It is the largest pumped-storage power station in the world.
From Wikipedia, “Water is released from the upper reservoir during periods of high demand and is used to generate electricity. What makes this different from other hydroelectric dams is that during times of low demand, power is taken from coal, nuclear, and other power plants and is used to pump water from the lower to the upper reservoir. Although this plant uses more power than it generates, it allows these other plants to operate at close to peak efficiency for an overall cost savings. Back Creek and Little Back Creek, the water sources used to create the reservoirs, have a relatively small flow rate. However, since water is pumped between the reservoirs equally, the only water taken from these creeks now that the reservoirs are full is to replace the water lost to evaporation. During operation, the water level fluctuates by over 105 feet (30 m) in the upper reservoir and 60 feet (20 m) feet in the lower reservoir.“