SITE SUBLEASEExhibit 6 • April 1st, 2018 • New YorkThis SITE SUBLEASE (as the same may be amended, modified or supplemented, this “Site Sublease”), dated as of July 1, 2007, between MANSFIELD 2007 TRUST A, a Delaware statutory trust (“Site Sublessor” or “Lessor”), and FIRSTENERGY GENERATION CORP., an Ohio corporation (“Site Sublessee” or “FGCO”).