Constellation & Calpine's Impact on US Clean Energy

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Constellation's HQ in Baltimore, USA
Constellation’s purchase of Calpine for US$16.4bn creates the largest US power generator and is set to have a significant impact on energy procurement

Constellation's decision to purchase Calpine is one of the largest takeovers in the energy industry.

“This acquisition will help us better serve our customers across America, from families to businesses and utilities,” says Joe Dominguez, President and CEO of Constellation. 

Joe Dominguez, President and CEO of Constellation

About Constellation

Revenue: US$24bn (12 months ending September 2024)
Market cap: US$94.9bn
President and CEO: Joseph Dominguez
Employees: 13,800+
Customers: 2.5 million (after Calpine merger)

With its headquarters in Baltimore, Maryland, US, Constellation Energy is a giant in supplying electric power, natural gas and energy management solutions.

Initially catering to two million subscribers across various sectors including an impressive three-quarters of Fortune 100 companies, this acquisition raises its customer base to more than 2.5 million.

This expansion solidifies its status as the largest competitive retail electricity supplier in the US.

Meet Calpine

Calpine is the top generator of electricity via natural gas and geothermal resources in the US, boasting an operational footprint that reaches 24 states and international markets in Canada and Mexico.

The total generation capacity of its 76 power plants (including those under construction) exceeds 25,000MW.

A flagship facility under Calpine is The Geysers, located in the Mayacamas Mountains north of San Francisco.

This area, the largest complex of geothermal power plants globally, spans 45 square miles along the Sonoma and Lake County border and taps into the earth's natural steam reservoirs.

Andrew Novotny, President and CEO of Calpine

Enough renewable electricity is generated here to power a city the size of San Francisco.

Andrew Novotny, President and CEO of Calpine, says: “This is an incredible opportunity to bring together top tier generation fleets, leading retail customer businesses and the best people in our industry to help drive a stronger American economy for a cleaner, healthier and more sustainable future. 

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Impact of the Constellation-Calpine merger

The merger between Constellation and Calpine isn't just a sizable addition of customers; it's a transformative movement in the energy sector.

It bears significant implications for energy procurement, providing an expansive suite of zero-emission and low-carbon energy solutions to an increased client base.

This positions the joint entity as the national leader in competitive retail electric supply and promises substantial enhancements in service reliability and sustainability measures.

Both companies are trailblazers in America's shift towards more reliable and cleaner energy sources and their combined efforts are expected to hasten investments across a variety of clean technologies, notably nuclear and battery storage solutions.

The Geysers in Northern California

Joe adds: “By combining Constellation’s unmatched expertise in zero-emission nuclear energy with Calpine’s industry-leading, best-in-class, low-carbon natural gas and geothermal generation fleets, we will be able to offer the broadest array of energy products and services available in the industry. 

“Both companies have been at the forefront of America’s transition to cleaner, more reliable and secure energy, and those shared values will guide us as we pursue investments in new and existing clean technologies to meet rising demand.

“What makes this combination even more special is it brings together two world-class teams, with the most talented women and men in the industry, who share a noble passion for safety, sustainability, operational excellence and helping America’s families, businesses and communities thrive and grow. We look forward to welcoming the Calpine team upon closing of this transaction.”


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