 WARRENVILLE, Ill.--BUSINESS WIRE--Exelon Generation, owner and operator of the Byron and Dresden nuclear energy facilities, will file Post Shutdown Decommissioning Activity Reports PSDARs today with the Nuclear Regulatory Commission, detailing long-term site restoration plans for both stations after they shut down this fall. The filings are among the final steps in retiring the plants, which face revenue shortfalls in the hundreds of millions of dollars due to low energy prices and market p 