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

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Presentation on theme: "1 Irrigation Efficiency Webinar September 23, 2014 Ron Rose Energy Efficiency Consultant Nebraska Public Power District."— Presentation transcript:

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 ) 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~$ /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 recipients of 148 nationwide $418, recipients of 375 nationwide $2,332, recipients of 345 nationwide $1,002, recipients of 639 nationwide $1,586,622 $163, recipients of 599 nationwide $1,504,038 $2,704, recipients of 650 nationwide $2,834,914 $3,031, recipients of 430 nationwide $215,305 $20, recipients of 694 nationwide $365,591 $54, 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, Federal Tax credits (30%) $21,009$49, USDA REAP grant (25%) $17,508$31, 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 for additional or contact: Ron Rose, Energy Efficiency Consultant (402) 362–7326

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