Constellation Energy to Buy Power Producer Calpine NYT | Top Stories Rebecca F. Elliott 10 January 2025 at 21:47 Constellation Energy’s deal to buy Calpine is being driven by fast-rising demand for electricity in part by the technology industry’s investments in artificial intelligence. © Tamir Kalifa for The New York TimesCalpine’s natural gas power plants, like this one in Richmond, Texas, are increasingly valuable because of the rising demand for electricity from data centers.