U.S. nuclear capacity factors: Stability and energy dominance

Fri, May 2, 2025, 7:57PMNuclear NewsSusan Gallier
Fig. 1. Median capacity factor of all reactors. The median DER net capacity factor of the 92 reactors included in this survey for the three-year period 2022–2024 is 90.96 percent. The 92 reactors in this survey are being compared with 94 reactors in 2019–2021 (when Indian Point-3 and Palisades were also included); 98 in 2016–2018; 99 in 2013–2015. There were 104 reactors in the five three-year periods prior to that. There were 53 reactors in the database in 1980–1982, and in the five subsequent periods there were 60, 77, 97, 102, and 103.

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.

Keystone State lawmakers show interest in SMRs

Fri, Nov 18, 2022, 6:00PMNuclear News

The Pennsylvania House of Representatives this week adopted a resolution directing the Joint State Government Commission to conduct a “holistic” study on the benefits of nuclear energy and small modular reactors. (The JSGC, according to its website, serves as the Pennsylvania General Assembly’s primary research organization, providing the legislature with a readily available mechanism for conducting interdisciplinary studies.) The November 15 vote was unanimous, 197–0.

Nuclear FOMO

Thu, Aug 4, 2022, 7:49PMNuclear NewsSteven Arndt

Steven Arndt
president@ans.org

At the June ANS Annual Meeting in Anaheim, Calif., our Executive Director/CEO Craig Piercy used an interesting acronym: he said, “This meeting is so exciting we are going to give nuclear professionals FOMO with respect to ANS meetings going forward.” The term “fear of missing out” was common a few years ago, but I had not heard it recently. So when Craig used it, it really caught my attention. Craig was, of course, correct that the Annual Meeting was great: technically interesting, productive, and great fun, as well. It provided a wonderful opportunity to learn, network, and advance both academic and business goals. However, in thinking about this phrase I realized that in a lot of ways, getting people to realize how important nuclear science and technology is for making the world better is a lot like trying to get people to understand that they are truly missing out.


Report: GHG reductions will flatline without existing and advanced nuclear

Tue, Aug 17, 2021, 8:09PMANS Nuclear Cafe

Carbon emission reductions from the power sector are likely to flatline after 2025 unless clean energy innovations and net-zero commitments from utilities pick up steam, concludes a report out this month from ClearPath, a conservative, Washington, D.C.–based clean energy nonprofit organization.

Clear Path to a Clean Energy Future: The Role of Utility Commitments on the Path to 2050 is the inaugural edition of a report to be published annually to track power sector trends and model the impacts of new technologies and policies. For the 2021 analysis, the authors engaged the research firm Rhodium Group to model ClearPath-designed scenarios using RHG-NEMS, a version of the National Energy Modeling System developed by the Energy Information Administration.