Philadelphia Energy Solutions LLC, the owner of the largest U.S. East Coast oil refining complex, announced to its employees on Sunday that it plans to file for Chapter 11 bankruptcy, according to an internal memo reviewed by Reuters.

The bankruptcy would come six years after private equity firm Carlyle Group LP (CG.O) and Energy Transfer Partners LP’s Sunoco Inc rescued Philadelphia Energy Solutions from financial distress, in a deal that was supported by tax breaks and grants that saved thousands of jobs.

Following an agreement with its creditors, the company has secured access to $260 million in new financing, and said it expected the bankruptcy filing to have no immediate impact on its employees, according to the memo, which was confirmed by a spokeswoman for Philadelphia Energy Solutions. The spokeswoman declined to comment further.

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