Constellation Energy has secured a significant regulatory victory that paves the way for the restart of Three Mile Island's Unit 1 reactor. According to Utility Dive, the Federal Energy Regulatory Commission (FERC) granted the utility a waiver allowing it to transfer capacity interconnection rights—a move that could enable the facility to deliver its full power output once operations resume.
The waiver represents a critical step in Constellation's timeline to bring the dormant Pennsylvania nuclear facility back online, potentially by the end of 2027. Nuclear power has become increasingly attractive to utilities and technology companies seeking reliable, carbon-free baseload energy to support data centers and meet sustainability goals. The restart signals renewed confidence in nuclear as a key component of the nation's energy infrastructure.
For Arizona and the broader Southwest region, the Three Mile Island restart carries implications for grid stability and power supply. As demand for electricity surges due to data center expansion and economic growth in Phoenix and surrounding areas, additional baseload generation capacity from nuclear sources could help moderate wholesale electricity costs and improve grid reliability across interconnected markets.
The regulatory milestone also underscores shifting attitudes toward nuclear energy in an era of climate concerns and rising power demands. If Constellation successfully restarts Three Mile Island by 2027, it could influence similar restart discussions at other idled nuclear facilities nationwide and reinforce nuclear's role in balancing the grid as renewable energy penetration increases.