After issuing warnings it may have to close down half its nuclear fleet, Exelon has introduced a proposal it says would keep them open. It signals the start of what's expected to be a long debate over energy policy in Illinois.
Exelon is one of the biggest and most powerful corporations in the state.
"No one from Exelon has ever denied that the company is profitable. It is," said Joe Dominguez, Senior Vice President of Exelon Generation.