WASHINGTON, D.C. — U.S. utilities are testing upgrades that could boost the output of existing nuclear reactors by up to 6 percent, a move aimed at bridging the gap while new plants face multi‑year construction delays, according to a peer‑reviewed study released this month.

The research, published in *Energy Policy*, examined 12 reactors operating at the nation’s three largest nuclear sites. By increasing turbine efficiency, extending fuel cycles and optimizing plant controls, operators could raise the capacity factor from an average of 90 percent to roughly 95 percent without major capital outlays. The authors estimate an additional 9 gigawatts of electricity could be generated annually, enough to power about 2 million homes.

KEY POINTThe research, published in *Energy Policy*, examined 12 reactors operating at the nation’s three largest nuclear sites.

“Extending the life of existing assets is a pragmatic response to the urgent need for low‑carbon baseload,” said Dr. Elena Morales, a senior analyst at the Energy Information Administration. “The modest efficiency gains translate into measurable emissions reductions, especially when the alternative is increased reliance on natural‑gas peaker plants.”

Industry groups caution that the savings hinge on regulatory approval and the availability of skilled staff to implement the upgrades. A recent report by the Nuclear Energy Institute notes that retrofits could cost between $150 million and $300 million per plant, but the projected revenue from additional megawatt‑hours could offset up to 70 percent of those expenses over a ten‑year period.

Economists highlight the climate economics of the approach. A 2024 analysis from the Brookings Institution finds that each percentage point increase in capacity factor cuts CO₂ emissions by roughly 0.5 million metric tons per year, reinforcing nuclear power’s role in meeting the United States’ 2030 emissions target.

Key Takeaways

• Peer‑reviewed data suggest a 6 % boost in output is technically feasible for many U.S. reactors.
• Improved capacity factors could add 9 GW of clean electricity, offsetting fossil‑fuel generation.
• Economic models project a payback period of 7–12 years, depending on upgrade scope and fuel prices.

While the strategy does not replace the need for new builds, the findings provide a data‑driven option for utilities to extract more low‑carbon power from the fleet already in service, buying time for the next generation of reactors to come online.