The cheapest new nuclear power in America may come from reactors that have been running for decades. On 27 October, the Energy Department offered Constellation Energy up to US$5 billion to get nearly 1.1 gigawatts more out of plants it already owns.

Byron Clean Energy Center in northern Illinois from the air, February 2025. Photo: MediaGuy768 / Wikimedia Commons (CC BY-SA 4.0), cropped and resized