1
                                                                    EXHIBIT 4.8b



SCHEDULE IDENTIFYING SUBSTANTIALLY IDENTICAL AGREEMENTS TO LEASE INDENTURE OF
TRUST CONSTITUTING EXHIBIT 4.8a HERETO



1. Lease Indenture of Trust, Mortgage and Security Agreement dated as of August
24, 2000 between Keystone Lessor Genco LLC and Bankers Trust Company

2. Lease Indenture of Trust, Mortgage and Security Agreement dated as of August
24, 2000 between Shawville Lessor Genco LLC and Bankers Trust Company