Exelon was working to restore operations at a nuclear reactor unit near Rockford, after the reactor went down Monday morning.

Unit 2 at Byron Generating Station shut down around 10:18 a.m., after losing power from an off-site source, Exelon officials said. Diesel generators began supplying power to the plant equipment and operators began releasing ...

(AP) — A failed electrical insulator in a switchyard was to blame for the power failure that caused one of Exelon Corp.'s nuclear reactors in Northern Illinois to shut down, company officials said Tuesday. Officials hoped to ...

The seemingly minor accident at Exelon Nuclear's Byron Generating Station about 95 miles north of Chicago, which resulted in a small release of radioactive Tritium on Monday, evokes memories of then-Sen. Obama's deep ...

Exelon Corp., which operates Illinois' 11 nuclear reactors, believes it will take three to five years to complete studies for all of its plants before determining whether any need upgrades, but "would not expect to incur significant ...

When Constellation Energy and Exelon Energy merge, their combined corporate headquarters will be in Chicago, but some of their businesses will remain in Baltimore.

The federal government says nuclear plants throughout the central and eastern U.S. must be reassessed within four years to determine how well they might withstand earthquakes. The Nuclear Regulatory Commission this ...

Exelon Corp.'s selection of a potential $120 million Baltimore headquarters site for Constellation Energy Group in Harbor Point was made in part because the property already had lucrative developer tax breaks attached to it, ...

Chicago-based Exelon, which pledged to build a headquarters in the city as part its buyout of Baltimore-based Constellation, announced Wednesday that it had selected a property in the Harbor Point development.