Baltimore-based energy company Constellation’s plans to acquire a Houston, Texas-based natural gas producer in a $26.6 billion deal will boost the nation’s biggest energy firm right as

Constellation Energy Corporation ( CEG, Financials) said Friday that it will purchase Calpine Corporation ( CPN, Financials) for $26.6 billion in cash and shares, becoming the largest US renewable energy provider. The agreement combines Calpine's low-carbon natural gas and geothermal with Constellation's emissions-free nuclear.

In interesting timing, Friday's announcement came on the silver anniversary of the disastrous AOL/Time Warner merger.

Constellation Energy is nearing a roughly $30 billion deal to acquire power producer Calpine, people familiar with the matter said on Wednesday, a move that would significantly expand Constellation's generation assets at a time of rising U.

Constellation Energy Corp. is nearing an acquisition of Calpine Corp., people familiar with the matter said, in what would be one of the biggest ever deals in the power generation sector.

Constellation Energy Corporation CEG and Calpine Corp. announced that they have entered into a definitive agreement under which CEG will acquire Calpine in a cash and stock transaction valued at an equity purchase price of nearly $16.

Texas' surging growth in power demand was a big driver in the $26.6 billion deal to acquire Houston's largest private company.