Three commercial power reactors across two Illinois nuclear power plants—Constellation’s Clinton and Dresden—have had their licenses renewed for 20 more years by the Nuclear Regulatory Commission.

When Constellation decided to install replacement Alstom low-pressure turbines at three of its boiling water reactor plants more than 15 years ago, one benefit was knowing the new turbines should operate reliably—and without major inspections—for several years.

Mike Kramer has a background in finance, not engineering, but a combined 20 years at Exelon and Constellation and a key role in the deals that have Meta and Microsoft buying power from Constellation’s Clinton and Crane sites have made him something of a nuclear expert.

Kramer spoke with Nuclear News staff writer Susan Gallier in late August, just after a visit to Clinton in central Illinois to celebrate a power purchase agreement (PPA) with Meta that closed in June. As Constellation’s vice president for data economy strategy, Kramer was part of the deal-making—not just the celebration.

Constellation is considering adding 2,000 MW of nuclear energy at Calvert Cliffs, located on Chesapeake Bay near Lusby, Md., which would effectively double the site’s output, according to the company’s near- and long-term project proposals submitted to the Marland Public Service Commission this week.

The Illinois General Assembly passed a clean energy bill on October 30 that would, in part, lift a 30-year moratorium on new nuclear energy in the state and create incentives for more energy storage.

The International Atomic Energy Agency presented its 2025 Global ISOP Innovation Award for AI to Blue Wave AI Labs, Constellation, and the Southern Company subsidiary Southern Nuclear for the companies’ collaborative work on Blue Wave's ThermalLimits.ai. The technology is an AI application that provides accuracy in online thermal limit forecasting for boiling water reactors.

The Nuclear Regulatory Commission has found that the environmental impacts of renewing the operating license of the Dresden nuclear power plant outside Chicago, Ill., for an additional 20 years are not great enough to prohibit doing so.

Rhoades

Mudrick

Longtime nuclear industry executive Chris Mudrick has been named the new chief nuclear officer at Constellation Energy, effective September 29. He will take over the position from Dave Rhoades, who is retiring from the role.

History: Mudrick has been Constellation’s senior vice president of generation growth since December 2024, a position that marked his return to the company after serving as executive vice president and CNO at Bruce Power in Ontario, Canada, for more than four years. Prior to joining Bruce Power, Mudrick was at Constellation/Exelon for more than 32 years, ending his time there as senior vice president of operations–East and chief operating officer. He began his career with the company as a nuclear power plant operator in Pennsylvania in 1987.

The Nuclear Regulatory Commission has found that the environmental impacts of renewing the operating licenses of the Peach Bottom and Browns Ferry nuclear power plants for an additional 20 years are not great enough to prohibit doing so. If renewed, the licenses will allow the plants to operate for up to 80 years.

Constellation has reported that its employees were joined by hundreds of community members and labor leaders on August 26 at the Clinton Clean Energy Center to celebrate a power purchase agreement between Constellation and Meta that supports the relicensing, continued operation, and expansion of Clinton for another two decades. The rally was held at the plant site, located in rural DeWitt County, Ill.

Despite being home to just one nuclear power plant, the 1,756-MWe Calvert Cliffs, Maryland is among the top producers of nuclear power in the country relative to its total generated power.

This is an energy strategy that Maryland Gov. Wes Moore recently said he plans to expand on, in part through his recent signing of the state’s Next Generation Energy Act, H.B. 1035.

Representatives across all levels of Pennsylvania government convened at Carnegie Mellon University on July 15 with investors and key leaders in the energy community at the behest of Sen. Dave McCormick (R., Pa.).

The Nuclear Regulatory Commission is conducting a special inspection at Constellation’s Quad Cities nuclear plant to review two events caused by battery issues. Neither event had any impact on public health or plant workers.

Meta is teaming up with Constellation to buy nuclear power from an Illinois plant over the next 20 years in a power purchase agreement that helps support the goals of both companies.

Here’s a look at some recent announcements from the Nuclear Regulatory Commission.

Summer SLR: The NRC this month published its final environmental impact statement for Summer Unit 1’s subsequent license renewal application. Dubbed a supplemental EIS, the report is an important step in determining if Dominion Energy can continue operating its 966-MWe Westinghouse pressurized water reactor unit for an additional 20 years beyond August 6, 2042, the current end of its license.

Nuclear generation has inertia. Massive spinning turbines keep electricity flowing during grid disturbances. But nuclear generation also has a kind of inertia that isn’t governed by the laws of motion.

Starting—and then finishing—a power reactor construction project requires significant upfront effort and money, but once built a reactor can run for decades. Capacity factors of U.S. reactors have remained near 90 percent since the turn of the century, but it took more than a decade of improvements to reach that steady state. The payoff for nuclear investments is long-term and reliable.

When Exelon Generation shut down Three Mile Island Unit 1 in September 2019, managers were so certain that the reactor would never run again that as soon as they could, they had workers drain the oil out of both the main transformer and a spare to eliminate the chance of leaks. The company was unable to find a buyer because of the transformers’ unusual design. “We couldn’t give them away,” said Trevor Orth, the plant manager. So they scrapped them.

Now they will pay $100 million for a replacement.

The turnaround at the reactor—now called the Crane Clean Energy Center—highlights two points: how smart Congress was to step in with help to prevent premature closures with the zero-emission nuclear power production credit of 0.3 cents per kilowatt-hour (only two years too late), and how expensive it is turning out to be to change course.

Craig Piercy
cpiercy@ans.org

I find myself saying the expression above a lot these days—to my kids, my wife, my friends, and colleagues. Most recently, I said it to the person sitting next to me after the pilot of our plane—bound for Reagan National Airport a day after the collision of AA flight 5342 and a military Blackhawk helicopter—aborted the landing at the last minute.

I am not sure where I picked up this pronouncement, but I find it to be apropos to the topsy-­turvy moment where we find ourselves in 2025. In addition to the first U.S. commercial airline crash in 15 years, we are witnessing a new presidential administration in its infancy playing by the Silicon Valley rules of “move fast, break things.” We’ve seen DeepSeek, the low-cost Chinese AI that reportedly uses 50–75 percent less energy than its NVIDIA-powered counterparts, tank Constellation’s market value by more than 20 percent in one late-January trading day.

Nuclear powerhouse Constellation Energy announced Tuesday it will spend roughly $100 million to upgrade critical electrical systems and plant equipment at its Calvert Cliffs nuclear power plant, where the company may pursue license renewals.

Iowa’s lone nuclear plant may soon see new life as NextEra Energy takes a step toward relicensing the Duane Arnold nuclear power plant.