A landmark Business Energy acquisition in the United States has created the nation’s largest electricity producer, reshaping the competitive landscape for large-scale power supply to industry, infrastructure and technology-led growth sectors.

Constellation, a US-based energy company headquartered in Baltimore, has completed its acquisition of Calpine Corporation from Energy Capital Partners. The combined group brings together Constellation’s zero-emission nuclear fleet with Calpine’s natural gas and geothermal generation portfolio, forming a diversified platform designed to meet rapidly rising electricity demand.

With a combined capacity of 55 gigawatts, the enlarged business will supply power to approximately 2.5 million retail and business customers across the US. Its footprint is particularly strong in high-demand regions such as Texas and California, while maintaining significant operations in Illinois, Maryland, New York and Pennsylvania.

Joe Dominguez, president and CEO of Constellation, said: “This isn’t just about two great companies coming together — it’s about strengthening America’s future. Constellation is stepping up to power America’s growth when our nation’s demand for energy is surging.”

The transaction positions the group as a key Business Energy partner for energy-intensive sectors including data centres, advanced manufacturing and critical infrastructure, all of which are driving new load growth linked to artificial intelligence and digital transformation. By combining dispatchable gas generation with nuclear baseload and geothermal assets, the company is targeting reliability alongside decarbonisation.

Andrew Novotny, president and CEO of Calpine, said: “We have the assets that power America today and meet the needs of tomorrow. Our expanded capabilities will allow us to better serve customers and communities, enable investment in critical infrastructure and support national priorities for energy security.”

See the details on how large-scale consolidation is redefining business energy supply for the next generation of industry and infrastructure.

(Photo Credits to Business Wire)