1. Load Research Status January 15, 2002

2. © 2000 PACIFICORP | PAGE 2 What is Load Research? “An activity embracing the measurement and study of the characteristics of electric loads to provide a thorough and reliable knowledge of trends, and the general behavior of the load characteristics of the more important electrical services rendered by the electrical utility industry” Source: AEIC Load Research Manual 2000 Edition

3. © 2000 PACIFICORP | PAGE 3 Data Acquisition Optic Probe (manual)1085 Dedicated Telephone 125 Cellular Telephone 925 Packet Radio 8 Total2143 Load Research StudyOregon SB1149 Large Customer Billing Special Studies Energy Profiler Online2002 Olympics Remote Meter Reading

4. © 2000 PACIFICORP | PAGE 4 Sampling Methodology Mean Per Unit Stratified (kWh, kW, hp, LF, Weather Zone) Sampling Variable (kWh, kW, hp) Random Sample Selection Dalenius-Hodges Minimum variance stratification Neyman Allocation Optimal allocation of sample points to strata 90% +/- 10% Precision 1978 PURPA & Industry Standard

5. © 2000 PACIFICORP | PAGE 5 Sample Rotation Utah ResidentialMPU kWh2000Ongoing C&I Rate 023MPU kWh1991Ongoing C&I Rate 006 (< 1MW)MPU kWh1991Ongoing C&I Rate 009 (< 1MW)MPU kW1991Ongoing C&I > 1MWCensusOngoing IrrigationMPU kW1992Historical StreetlightsBurning Hour Calculation Oregon ResidentialMPU kWh1995Ongoing C&I Small-MediumMPU kWh1994Ongoing C&I > 1MWCensusOngoing SB1149(> 200 kW)CensusOngoing SB1149 Res. TOUMPU kWh/Zone Estimation MethodDesign VintageCycle

6. © 2000 PACIFICORP | PAGE 6 Sample Rotation Idaho Residential 001MPU kWh20005-Year Residential 036MPU kWh20005-Year C&I < 1MWHistorical19965-Year C&U 008 & 009CensusOngoing C&I > 1MWCensusOngoing IrrigationMPU kW1999Ongoing StreetlightsBurning Hour Calculation Washington ResidentialHistorical19985-Year C&I Small-MediumHistorical19955-Year C&I > 1MWCensusOngoing Estimation MethodDesign VintageCycle

7. © 2000 PACIFICORP | PAGE 7 Sample Rotation Wyoming West Residential 001Historical19985-Year C&I < 1MWHistorical19945-Year C&I > 1MWCensusOngoing IrrigationBased on Idaho 039 StreetlightsBurning Hour Calculation Wyoming East ResidentialHistorical19985-Year C&I Small-MediumHistorical19945-Year C&I > 1MWCensusOngoing California ResidentialBased on Oregon C&I < 1MWBased on Oregon C&I > 1MWCensusOngoing Estimation MethodDesign VintageCycle

8. © 2000 PACIFICORP | PAGE 8 Utah Sample Stratification

9. © 2000 PACIFICORP | PAGE 9 Historical Comparisons

10. © 2000 PACIFICORP | PAGE 10 Historical Comparisons - Continued

11. © 2000 PACIFICORP | PAGE 11 Historical Comparisons - Continued