CEG

Constellation Energy Corporation

A power company that is the largest U.S. producer of clean, carbon-free energy, running the country's biggest nuclear fleet along with gas, hydro, wind, and solar plants, and selling electricity to homes and businesses. Its roots reach back to the Gas Light Company of Baltimore, founded in 1816, and it took the name Constellation in 1999 to reflect its many operations grouped like stars in a sky. Today it is restarting the old Three Mile Island reactor—renamed the Crane Clean Energy Center—to power Microsoft's data centers.