Coal plant reuse accelerates grid capacity
Developers are repurposing retired coal plant infrastructure to connect new generation faster, leveraging existing interconnection rights and transmission
Load growth from data centers, manufacturing, and electrification is outpacing new generation and transmission. With power buyers contracting now, speed to the grid is essential. Reusing the infrastructure of retired coal plants offers a critical shortcut.
Why retired coal plants are strategic assets
A retiring coal plant is more than a shuttered facility. It comes with existing interconnection rights, transmission connections, water access, industrial land, and a trained workforce. These assets can transfer to a replacement resource. Reusing them avoids building and paying for new transmission and switchyards.
Gas, solar-and-storage, or nuclear projects all reach the grid faster when the connection already exists. Equipment can also carry over. Many gas conversions, for instance, retrofit the old coal boiler and reuse the steam turbines. This reuse model also addresses local economic wounds. A coal plant is often the largest local taxpayer. When it closes, the tax base and payroll can vanish with it.
Real-world reuse projects in action
Developers are actively leveraging these sites. In DeSoto Parish, Louisiana, interconnection rights from the retired Dolet Hills coal plant were swapped to a new 240-MW solar-and-storage project. It won approval in roughly 18 months.
In Becker, Minnesota, Xcel Energy is turning the retiring Sherco coal plant into a clean-energy hub. A large solar complex, with 710 MW online today and expanding to 910 MW by 2029, reuses the site's infrastructure and workforce. In Pennsylvania, the retired Bruce Mansfield plant is being repowered with gas to deliver 2,550 MW onto the PJM grid. The project reuses existing transmission and water access, and refurbishes the coal boiler and steam turbines.
In Wyoming, TerraPower is building its Natrium reactor near the Naughton coal plant, which was converted to gas. The company expects to draw on and retrain the existing workforce, citing an alignment of nuclear work with coal-plant skills.
Economic and workforce benefits of reuse
Reuse can restore much of a community's lost tax base and payroll. Synchronizing a new project with a retirement allows it to rehire the incumbent crew as it staffs up. Early planning is key. Help for displaced workers often comes too late. Standing up a new opportunity and a reskilling bridge before the doors close fixes that.
The scale of the opportunity is significant. U.S. Energy Information Administration data show more than 630 coal units have retired since 2000. Of those, 329 had a nameplate capacity of 100 MW or more. Another 467 coal units, representing 183 GW of nameplate capacity, still operate and many are aging toward retirement.
Briggs White, who spent 18 years at the U.S. Department of Energy, argues for the value of these sites. "I would argue these sites are among the most valuable assets we have to address rising demand," White said.
Challenges and limits of the reuse model
Despite advantages, reuse faces hurdles. New transmission can take a decade, but reusing old lines isn't always simple. Lawrence Berkeley National Laboratory finds the wait from interconnection request to operation has doubled to more than four years, with wide swings by grid operator. Interconnection rights must transfer within a tight window-usually about a year.
On-site coal waste can be costly to remediate. Experience in Illinois shows repurposing takes sound fundamentals. The state's Coal to Solar Initiative made 11 sites eligible but only three were built.
Those built projects reused the sites’ grid connections and added local tax revenue, albeit far less than the coal plants paid. The harder part is workforce and timing. Some communities are taking a strategic view. In one instance, Beaver County, Pennsylvania, told developers, "we will not stand in your way on private land, but you will not get our strategic support either."
Rebuilding in an established energy community may sidestep much of the permitting and local opposition that greenfield projects face. A 2022 study found reusing a coal plant’s infrastructure could cut a new nuclear plant’s capital cost 15% to 35% versus a greenfield site. From 2011 to 2019, more than 100 coal plants were converted to or replaced by gas. Some coal retirements are now delayed due to demand, but the coal fleet is aging and units continue to close. Developers and utilities are increasingly prioritizing sites with existing interconnection rights to shorten project timelines amid rising demand.
