1 Exhibit 4.5b Participation Agreement (NC 1/2) dated July 13, 2000 among the Registrant, Montana OL1 LLC, Wilmington Trust Company, Montana OP1 LLC, and The Chase Manhattan Bank, as Lease Indenture Trustee and as Pass Through Trustee.

   1
                                                                    Exhibit 4.5b

Participation Agreement (NC 1/2) dated July 13, 2000 among the Registrant,
Montana OL1 LLC, Wilmington Trust Company, Montana OP1 LLC, and The Chase
Manhattan Bank, as Lease Indenture Trustee and as Pass Through Trustee.