Transmission Capital Project Updates

Transmission Expansion Plan Sigurd to Red Butte 345 kV line in-service May, 2015 Permitting activities continue on key segments including Gateway West, Gateway South, Oquirrh – Terminal, and Boardman to Hemingway 2

Main Grid System Reinforcement Projects On-going reinforcement projects in all states. Projects include: – NERC TPL improvements (N-1, N-1-1) Reconductoring for higher capacity New substations Substation transformer capacity increases New circuit breakers and bus configurations Reliability / Voltage improvements – Capacitor banks – Reactors – Synchronous condenser 3

Main Grid System Reinforcement Projects Cont. Key On-going or Upcoming Projects Include: – Goshen Area Load Tripping RAS (ID) – Goshen-Jefferson-State Line 161 kV Reconductor (ID) – Casper Sub Install kV 250 MVA Transformer (WY) – Standpipe Substation New 230 kV Sub (WY) – Ben Lomond to Parrish 138 kV Line (UT) – Union Gap – Add kV Capacity (WA) – Vantage – Pomona Heights 230 kV line (WA) – Sams Valley kV New Sub (OR) – Snow Goose kV New Sub (OR) 4

Generation Interconnection & Customer Driven Projects PacifiCorp is obligated to interconnect generation customers The transmission facility additions for interconnections shall maintain or improve the level of system reliability Qualifying Facility generation interconnection requests continue to be a significant number of the requests moving forward Network Customer Projects are being constructed to meet actual and studied/forecasted load requirements 5

Generation Interconnection & Customer Driven Projects Cont. Key On-going or Upcoming Projects Include: – Pavant-Flowell-Fillmore 138 kV Rebuild (UT) – Hurricane West (Purgatory Flat substation) New Delivery Point (UT) – St. George Sub Install kV Transformer (UT) – Wallula to McNary 230 kV Line (WA/OR) 6

Local Transmission Reinforcement Projects Local Transmission and Substation system reinforcement projects are on-going in all states – Projects are identified in the Five Year Area Planning studies – Actual loading levels + forecasted load determines timing of the projects – Projects include: Substation transformer capacity additions New substations and load transfers Transmission line reinforcements to increase capacity Voltage conversions 7