In a rapidly evolving energy landscape and amidst rising market competition, the largest electricity provider in the United States, Constellation Energy, continues to redefine industry boundaries. This week, the company has attracted renewed scrutiny as it defends its ambitious acquisition of the private firm Calpine, a leader in natural gas and geothermal energy. Announced back in January, this major acquisition—valued at USD 16.4 billion—is among the most significant deals in the US energy industry. However, the move has stirred concerns among consumer groups worried that the merger might grant the combined entity excessive market control.