Constellation Energy

Built World

Seller in the Walmart deal

Walmart just bought nuclear power. On June 23, 2026, the retailer signed a long-term deal for electricity from Constellation's Dresden plant in Illinois. It is Walmart's first nuclear agreement.

Updated Jun 23

Built World

Largest U.S. power generator following Calpine acquisition

West Virginia has no base-load natural gas power plants online. Governor Patrick Morrisey announced that Calpine, a Constellation Energy subsidiary, will build a $1 billion, 500-megawatt gas plant in Marshall County as part of $4.2 billion in energy investments. The investments, drawn in just four weeks, aim to transform a coal-dependent economy into what Morrisey calls 'the battery of the East Coast.'

Updated May 22

Built World

Nation's largest electricity producer pursuing digital modernization across expanded fleet following Calpine acquisition

The NRC approved something unprecedented in January 2026: replacing analog safety controls at an operating reactor with fully digital systems. Constellation's $167 million upgrade at Limerick replaces 1980s-era control rooms with digital command centers — the first time regulators have approved swapping multiple analog safety systems for a single digital platform with fuel rods still running.

Updated May 21