1. 1 Irrigation Efficiency Webinar September 23, 2014 Ron Rose Energy Efficiency Consultant Nebraska Public Power District

2. What We Will Cover Today NPPD Irrigation Load Management NPPD EnergyWise Pump Efficiency Program Leveraging the USDA RD REAP program NPPD Irrigation – PV Solar pilot project

3. 42,000 Irrigation Accounts System-Wide in 2013

5. System-Wide On-Peak Peaks

6. 6

7. Pump Efficiency Program

8. Why Energy Efficiency is important Helps consumers control cost of energy Reduces peak demands and/or energy usage  Delays need for additional generation  Reduces purchased energy costs State Statute (Section 66-1060) requires integrated resource planning (IRP)  Evaluate full range of alternatives, including energy efficiency and conservation  Helps position utility with regulators and other stakeholders when new generation resources are needed in the future

9. Irrigation Efficiency Opportunities Combined Summary

10.  Common opportunities ◦ High to low pressure conversions, center pivot ◦ Gated Pipe to center pivot or Sub-Surface Drip conversion ◦ Wrong pump installed for current irrigation system  Choke valve installed? Application? ◦ Pump is old and wore out, needs rebuilt ◦ Variable Frequency Drive  Field elevation or pumping water level changes  Swing arm and/or endgun  Different irrigation system types on same pump  Multiple systems on one pump ◦ Soil Moisture sensors EnergyWise Irrigation Efficiency

11. Simple Paybacks from Energy Savings

12. EnergyWise Costs All programs are cost justified from a generation avoidance perspective. The savings result from reduced incremental fuel and purchased energy costs. NPPD’s average near-term savings (avoided costs) are greater than the program costs: Est. Savings Estimated (Avoided Costs) Program Costs  Irrigation~$0.037-0.015/kWh~ $0.02/kWh

13.  What Program Provides ◦ Up to $350 for Pre-Improvement Efficiency Test ◦ Incentive of $0.20 per kWh saved on annual basis ◦ Verified efficiency improvements ◦ Energy savings and lower electrical costs for years to come! EnergyWise Irrigation Efficiency

14.  Incentive calculation example Current energy demand = 56 kW (75 H.P.) New energy demand - 36 KW (48 H.P.) demand reduction 20 KW annual operating hours = 500 incentive = 20 kW x 500 hrs. x $0.20/kWh = $2,000

15.  System Modifications and Post-pump efficiency test are completed within one year  Electrical Utility will provide incentive amount by check or billing credit

16.  Provides Grants & Loan Guarantees for: Renewable Energy Projects and Energy Efficiency Projects

17. grants guaranteed loans 2005 37 recipients of 148 nationwide $418,348 2006 151 recipients of 375 nationwide $2,332,310 2007 102 recipients of 345 nationwide $1,002,797 2008 154 recipients of 639 nationwide $1,586,622 $163,368 2009 89 recipients of 599 nationwide $1,504,038 $2,704,419 2010 156 recipients of 650 nationwide $2,834,914 $3,031,260 2011 24 recipients of 430 nationwide $215,305 $20,900 2012 31 recipients of 694 nationwide $365,591 $54,700 2013 102 recipients of 1055 nationwide $1,725,677 $83,350 $12,477,451 $6,058,017 Renewable Energy Systems and Energy Efficiency Improvements Program Nebraska applications since 2005

18. NPPD 25kW PV Solar Pilot Project Solar Heat & Electric Frisch Electric

19. Goals: Install net-metered PV Solar with 60 HP or larger irrigation motor and a center pivot. Learn how PV Solar interacts with a 480/277V 3PH irrigation service Provide technical assistance to customers through experience gained from the pilot project

20. 25 kW DC Photo-Voltaic Solar project

21. Two 12.5 kW inverters

22. Forecasted vs Actual Monthly Energy Generation (kWh) ~40,000 kWh/year

23. Lessons Learned: load control switch interference Cannon Technologies : power line carrier system Preseason load control switch testing failed due to PV solar inverter noise interference Solution: capacitor across the switch

24. Summer: Replacing Energy at $0.0715/kWh (When irrigating) Selling NEG (Net Excess Generation) at $0.0960/kWh (Not irrigating) Winter: Selling NEG at $0.0551/kWh (Not Irrigating) Economics

25. Simple Payback 25 kW PV Solar Simple Payback financial calculations Effective costSimple Payback Years Total Project Cost $70,030 18.2 Federal Tax credits (30%) $21,009$49,02113.6 USDA REAP grant (25%) $17,508$31,51410.0 Notes: Federal Tax Credit assumes tax liability USDA REAP grant uncertain, depends on scoring and available funding Does not include: Insurance, personal property tax, depreciation or O&M Assumes irrigation rate increases 3% per year and solar panel degradation 0.8% per year Does not include cost of borrowing money

26. PV Solar Market Penetration vs. PV Solar price

27. Questions: Go to www.nppd.com for additional informationwww.nppd.com or contact: Ron Rose, Energy Efficiency Consultant (402) 362–7326 rvrose@nppd.com