Constellation Energy's $26.6 billion acquisition of Calpine Corp. propels it to the forefront of carbon-free electricity production in the U.S., enabling the company to secure crucial long-term power purchase agreements with Microsoft and Meta Platforms. Following a recent stock peak of $412 per share, the firm successfully cleared its PJM capacity in an auction and reached a pivotal agreement to restart the Three Mile Island Unit 1, positioning itself as a vital player in powering data centers and supporting the AI economy.