Citing historically low electricity prices and a challenging business environment for power generators, Chicago-based Exelon Corp. filed Chapter 11 bankruptcy protections for Exelon Generation Texas Power LLC (“EGTP”) — a merchant generation unit Exelon owns in Texas.  The unit will continue to own and operate the 1,265 MW Handley Generating Station in Fort Worth, Texas, in exchange for a $60 million payment to the lenders.