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

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.


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.