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

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

42,000 Irrigation Accounts System-Wide in 2013

System-Wide On-Peak Peaks

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Pump Efficiency Program

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

Irrigation Efficiency Opportunities Combined Summary

 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

Simple Paybacks from Energy Savings

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

 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

 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

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

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

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

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

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

25 kW DC Photo-Voltaic Solar project

Two 12.5 kW inverters

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

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

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

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

PV Solar Market Penetration vs. PV Solar price

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