Group 1 - Constellation Energy Corporation (NASDAQ:CEG) is a leading independent power producer in the U.S., focusing on clean energy solutions, particularly nuclear power [1][2] - The company has seen a significant stock price increase of over 175% in the last two years, although it has recently declined from $353 to $322 [1] - Constellation Energy is the largest producer of carbon-free energy in the U.S., operating the largest nuclear fleet and a diverse mix of energy sources including natural gas, wind, solar, and hydro [2] Group 2 - The company serves over 2.5 million customers and generates revenue through a mix of regulated and deregulated power markets [2] - The pending acquisition of Calpine is expected to enhance Constellation's generation portfolio by adding dispatchable gas capacity to its nuclear power capabilities [2] - Constellation Energy plays a crucial role in the U.S. energy transition, providing reliable and sustainable power essential for electrification and decarbonization efforts [2]