SPP Sub-Regional Planning Meeting Local Area 2 August 3, 2010 Nebraska Public Power District

1. SPP Sub-Regional Planning MeetingLocal Area 2August 3, 2010Nebraska Public Power District Randy Lindstrom Transmission Planning Supervisor

2. Nebraska Public Power District Political Subdivision of the State Governed by popularly elected Board of Directors Charter Territory in 91 of State’s 93 counties Serve Wholesale requirements for 77 municipalities and PPDs Also serve 88,000 customers at Retail

3. Nebraska Public Power District Peak load 2670 MW Heavy summer irrigation load Accredited generation capacity 3150 MW 4400 miles transmission line - 115kV, 230kV, & 345 kV 750 miles subtransmission 34.5kV & 69kV

4. Major Transmission Projects & Plans Twin Church / South Sioux City Area Broken Bow Wind Generation Petersburg Wind Generation Keystone XL Pipeline Projects Axtell – Spearville 345 kV Project

5. Twin Church / South Sioux City Area • Explosive Load Growth Due to Industrial Plant Expansions and Many New Industrial Plants Being Developed • Continued Conversion Of Irrigation Wells From Diesel to Electric Power • SubTransmission Capacity No Longer Able To Serve And Back up The New Projected Loads In This Area • Single Contingency Voltage & Thermal Violations On The Transmission System

6. Twin Church / South Sioux City Area Transmission Expansion Plan • Build Two New 115 kV Transmission Lines From Twin Church Substation to New South Sioux City Substation Forming a 115 kV Ring Configuration Around the City • Build New South Sioux City 115/69 kV Substation And Shift Load From Twin Church to New Substation • Re-Build Twin Church 115 kV Substation To A Breaker-and-a-half Configuration To Accommodate New 115 kV Expansion • If Loads Continue To Grow, Future Plans Are To Build A New Homer 345/115 kV Substation And Two New 115 kV Lines To South Sioux City And Emerson

7. Twin Church / South Sioux City Plan

8. Broken Bow Wind Project • 80 MW wind generation project near Broken Bow • Radial 115 kV transmission to connect wind to existing Broken Bow 115 kV substation (9 Miles) • RFP awarded, PPA & LGIA being negotiated • Other GI Interconnection / Network Upgrades • Substation Modifications at Broken Bow and Callaway. • 230/115 kV Transformer Upgrade at Canaday.

9. Bloomfield

10. Petersburg Wind Project • 80 MW Wind Generation Project Near Petersburg • Radial 115 kV Transmission to Connect Wind to New Petersburg North 115 kV Substation • PPA and LGIA Signed • Project Is Under Construction, In-Service December 2010 • Other GI Interconnection / Network Upgrades • Construct New Petersburg North Substation • Substation Modifications at Neligh and Albion

11. Bloomfield Petersburg

12. Q3 2012 Keystone (Phase One) Keystone XL (Phase Two) Q4 2009 Q4 2010 12 5

13. Keystone XL Phase 2 Oil Pipeline •  1900 miles of new Crude Oil Pipeline From Hardisty, Canada to Gulf of Mexico Refineries • Five Pumping Stations in NPPD service Territory • 116 MW New Incremental Load (Five pumping stations @22.4 MW each and one 4 MW tank farm) • Pump Station 22 – 10 miles south of Stuart, NE • Pump Station 23 – Near the town of Ericson, NE • Pump Station 24 – 9 miles north of Central City, NE • Pump Station 25 – 14 miles southeast of McCool , NE • Pump Station 26 – Near the town of Steele City, NE

14. Pump Station 22 (PS 22 or Stuart South) • Issues • Severe voltage depression/voltage collapse for N-1 Contingencies in this area • Transmission Plan • 28 Miles of New 115 kV Radial Transmission Line From O’Neill 115 kV to PS22 • Add an 18 MVAR 115 kV Cap Bank at O’Neill • Add a 9 MVAR 69 kV Cap Bank at O’Neill • Expand Ainsworth Cap Bank to 15 MVAR • Add 15 MVAR Capacitor Banks at PS 22

15. Pump Station 22 cont.

16. Pump Station 23 (Ericson) • Issues • Several N-1 Contingencies caused voltage and thermal violations • Transmission Plan • 37 Miles of New 115 kV Radial Transmission Line From Petersburg 115 kV to PS23 (Ericson) • New 15 MVAR Cap Bank at Petersburg • New 6 MVAR Cap Bank at Ericson

17. Pump Station 23 (Ericson) cont.

18. Pump Station 24 (PS 24 or Central City North) • Issues • N-1 Contingencies Result in Voltage Violations at Central City 115 kV • Transmission Plan • Construct New Clarks 115 kV Substation • Build 9 Miles New Radial 115 kV Transmission Line From Clarks to PS24 • Add 18 MVAR 115 kV Capacitor Bank at Clarks

19. Pump Station 24 cont.

20. Pump Station 25 (McCool) • Issues • Overload Existing McCool 115/34.5 kV 56 MVA Transformer • Sub-transmission Plan • Convert 34.5 kV to 69 kV and Replace 56 MVA Transformer With a New 115/69 kV 70 MVA Transformer

21. Pump Station 25 (McCool) cont.

22. Pump Station 26 (Steele City) • Issues • N-1 Contingencies Cause Voltage Violations & Thermal Overloads of Beatrice – Harbine 115 kV • Transmission Plans • Build New Harbine - Steele City – Knob Hill 115 kV Interconnection With Westar • Future Re-Conductor of Beatrice – Harbine 115 kV (2021)

23. Pump Station 26 (Steele City) cont.

24. Keystone XL Phase 2 Plan Summary •  76 Miles of New 115 kV line • O’Neill – PS 22 115 kV (28 miles) • Petersburg – Ericson 115 kV (37 miles) • Clarks – PS 24 115 kV (9 miles) • Steele City – Knob Hill 115 kV (2 miles for Nebraska section) • 87 MVAR of New Capacitive Injection • Ainsworth – 6 MVAR • O’Neill – 27 MVAR • PS 22 – 15 MVAR • Petersburg – 15 MVAR • Ericson – 6 MVAR • Clarks – 18 MVAR

25. Axtell – Spearville 345 kV Project • SPP Balanced Portfolio Project • Focused On Relieving Congestion On The Western Nebraska – Western Kansas Flowgate • Provides For Interconnection Of New Wind Generation • Total Of 226 Miles Of New 345 kV Line From Axtell – Post Rock – Spearville • NPPD Notice To Construct 53 Miles From Axtell to The State Line • In-Service Date June 2013

27. Questions ? For Additional Information, Contact: Randy Lindstrom rrlinds@nppd.com or 402-563-5240