BYRON – Exelon Generation completed its separation into two companies Wednesday, putting its nuclear fleet, including the Byron Nuclear Plant, under newly formed Constellation.Constellation now operates the carbon-free energy production side of Exelon as a standalone, publicly traded company, and Exelon serves as the transmission and distribution utility.’The future health and prosperity of our nation is inextricably linked to our success in eliminating carbon pollution, and our entire focus will be on helping our customers and communities achieve that goal,’ Constellation CEO Joseph Dominguez said in a news release.