NRG Energy’s South Texas Nuclear Generating Station stands i

NRG Energy’s South Texas Nuclear Generating Station stands in Bay City, Texas. Credit: F. Carter Smith / Bloomberg via Getty Images

NRG Energy’s South Texas Nuclear Generating Station stands in Bay City Texas, U.S., on Tuesday, Nov. 13, 2007. Exelon Corp., the biggest U.S. operator of nuclear power plants, offered to buy NRG Energy Inc. for $6.2 billion to take advantage of a 55 percent drop in the debt-laden company’s shares since July 1. (Photo by F. Carter Smith/Bloomberg via Getty Images)