Calpine, the largest private company in Houston, announced a deal to be acquired by Baltimore-based Constellation for approximately $16.4 billion Friday morning. Constellation would buy Calpine with ...

Microsoft signed a deal with Constellation last year to fulfill its growing need for electricity for its data centers. Barron ...

Constellation is buying natural gas and geothermal power provider Calpine for $16.4 billion, joining together two of the country's biggest power companies.