1. Transmission System Customer Discussions – July 2009
Common Use System (CUS)
Black Hills Power
Basin Electric Power Cooperative
Powder River Energy Corporation
Revised July 24, 2009

2. Agenda Introductions Common Use System Overview Basin Electric Costs
Transmission Rate Case Schedule
Customer Impacts
Discussion / Questions

3. Regional Transmission System - Existing
MONTANA
WYOMING
SHERIDAN
SPEARFISH
CARR
DRAW
RAPID
CITY
WYODAK
BUFFALO
Y. CRK
HUGHES
S. RC
DC TIE
B. CRK
RENO
OSAGE
PUMPKIN
BUTTES
TECKLA
HOT
SPRINGS
YELLOWCAKE
SPENCE
S DAKOTA
NEBRASKA
CASPER
Common Use System
DAVE
JOHNSTON
PacifiCorp System
WAPA System
M. MILE
STEGALL
LRS

4. Regional Transmission System - New
MONTANA
2009
2009
ARVADA
WYOMING
TONGUE
RIVER
2009
SHERIDAN
SPEARFISH
CARR
DRAW
2009
2009
WYODAK
Y. CRK
RAPID
CITY
BUFFALO
HUGHES
Donkey
Creek
S. RC
DC TIE
B. CRK
RENO
OSAGE
PUMPKIN
BUTTES
TECKLA
HOT
SPRINGS
2009
32 MVAr’s D-VAR
2010 (BH)
YELLOWCAKE
SPENCE
S DAKOTA
“DJ AREA”
NEBRASKA
CASPER
DAVE
JOHNSTON
Common Use System
Common Use System (new)
PacifiCorp System
M. MILE
WAPA System
STEGALL
LRS

5. Basin Electric Costs Cost of Equity Cost of Debt
General Plant Allocator
Capital Projects
Potential Future Facilities

6. Basin Electric Costs Cost of Equity – 10.80% Cost of Debt
General Plant Allocator
Capital Projects
Potential Future Facilities

7. Basin Electric Costs Cost of Equity – 10.80%
Cost of Debt – 5.95%(2009); 6.08%(2010)
General Plant Allocator
Capital Projects
Potential Future Facilities

8. Basin Electric Costs Cost of Equity – 10.80%
Cost of Debt – 5.95%(2009); 6.08%(2010)
General Plant Allocator – GP1 per settlement
Capital Projects
Potential Future Facilities

9. Basin Electric Costs Cost of Equity – 10.80%
Cost of Debt – 5.95%(2009); 6.08%(2010)
General Plant Allocator – GP1 per settlement
Capital Projects – $82.9m  $87.6m
Potential Future Facilities

10. Basin Electric Costs Cost of Equity – 10.80%
Cost of Debt – 5.95%(2009); 6.08%(2010)
General Plant Allocator – GP1 per settlement
Capital Projects – $82.9m  $87.6m
Potential Future Facilities
Generation Interconnection Network Facilities
Other?

11. Transmission Rate Case Schedule
FERC Filing – August 1, 2009 (July 31, 2009)
Effective Date – October 1, 2009
Compliance Filing – After end of Calendar year 2010, prior to June 1, 2011

12. Rate Impacts
Estimate Revenue Requirement of $18.30 million

13. Rate Impacts 2009 rate - $2.03 / kW-month Black Hills $ 9.41 m
Basin Electric m
PRECorp m
Revenue Credits (0.20) m
Total m
Usage – 980 MW
Rate – $2.03 / kW-Month

14. Rate Impacts 2010 rate - $2.44 / kW-month Black Hills $ 9.41 m
Basin Electric m 
PRECorp m
Revenue Credits (0.51) m
Total m
Usage – 973 MW 
Rate – $2.44 / kW-Month

15. Discussion / Questions