Investor Presentaiton

L 00000 Colstrip Power Plant Appendix 37 Existing Colstrip Ownership 1!!! 罪 Colstrip Transmission System Facility Owner (%) Unit 1 Unit 2 Unit 3 Unit 4 AVISTA Corporation 15% 15% NorthWestern Energy 30% PacifiCorp 10% 10% BPA & Eastern Intertie Portland General 20% 20% Puget Sound Energy 50% 50% 25% 25% Townsend Broadview B A Colstrip Talen Energy 50% 50% 30% Total 100% 100% 100% 100% Facility Owner (MW) Unit 1 Unit 2 Unit 3 Unit 4 System Owner Segment A Segment B AVISTA Corporation 10.2% 12.1% AVISTA Corporation 111.0 111.0 NorthWestern Energy 36.4% 24.3% NorthWestern Energy 222.0 PacifiCorp 6.8% 8.1% PacifiCorp 74.0 74.0 Portland General 13.6% 16.2% Portland General 148.0 148.0 Puget Sound Energy 33.0% 39.3% Puget Sound Energy 153.5 153.5 185.0 185.0 Talen Energy 153.5 153.5 222.0 Total 307.0 307.0 740.0 740.0 NorthWestern Energy Delivering a Bright Future

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