Expert Analysis: Dominion Can Retire Coal Plants, Save Ratepayers Millions Without Hurting Grid
A new expert analysis filed in South Carolina shows that Dominion Energy's long-range plan would produce excess electricity if it keeps its Wateree and Williams coal plants running past 2034. Retiring those plants would avoid roughly $200 million in compliance costs for federal wastewater rules while maintaining grid reliability, especially once the Canadys gas plant comes online. The Sierra Club argues that delaying closures would burden families and worsen air pollution.
Dominion Energy’s current plan already schedules the Wateree and Williams coal units for retirement in 2032 and 2034, but the company has repeatedly postponed such dates before. The new analysis, filed with South Carolina regulators, compares that plan against a scenario where the plants keep running past 2034, which would trigger roughly $200 million in federal wastewater compliance costs. The Canadys gas plant is expected to provide enough replacement capacity to keep the grid stable, even under higher-than-projected demand. The Sierra Club’s testimony also argues that Dominion understated the long-term financial and health risks of continued coal operation.
This analysis could shift how regulators weigh near-term reliability against long-term costs. If accepted, it may pressure Dominion to stick to its retirement schedule, potentially lowering bills for South Carolina ratepayers and reducing local air pollution. However, utility planning involves many uncertainties, and the company may push back, citing grid flexibility or fuel diversity. The outcome could influence similar coal-retirement debates in other states, as aging plants face stricter environmental rules and cheaper gas alternatives.