1

Irrigation Efficiency WebinarSeptember 23, 2014

Ron RoseEnergy Efficiency ConsultantNebraska 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

Irrigation Connected Load at Busbar (MW)

42,000 Irrigation Accounts System-Wide in 2013

775 793 811 821 830 838 862 899 939 952 987 1,022

1,067 1,132

1,212 1,284

1,380 1,462

1,562 1,637 1,686

1,713 1,838

1,936

0

200

400

600

800

1,000

1,200

1,400

1,600

1,800

2,000

2,200

1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012

MW

Irrigation Connected Load at Busbar (MW)

72.6%

74.1%74.6%

73.2%

70.5%

74.7%75.3%

76.4%

79.0%

80.1%80.5%81.4%

76.4%

81.2%

82.6%82.6%

85.0%84.7%

86.0%86.7%

87.0%

89.1%

82.0%

77.7%

60%

64%

68%

72%

76%

80%

84%

88%

92%

1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012

Sh

are

of

Co

nn

ecte

d L

oad

Share of Irrigation kW in Load Management

System-Wide On-Peak Peaks

217

252

13

69

123

231213

281

344

300329

401

366 372 383

489

560

515

576

441

502

597

647

573

0

50

100

150

200

250

300

350

400

450

500

550

600

650

700

1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012

MW

@ B

us

ba

r

Effective Irrigation Load Controlled Off at the time of NPPD's Busbar Billable Peak Hour

6

360

321

120161

288

429

390 380 380

334

427405

437

480

442

492 475

429446 447

472522

774

679

050

100150200250300350400450500550600650700750800850

1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012

MW

@ B

usb

arIrrigation Contribution to Busbar Billable Peak

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 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

Number of low pressure

conversions 29%

Number of pump opportunities,

39%

Number of Efficient

Systems, 32%

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

0.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52 55 58 61 64 67 70 73

Ye

ars

Pump Tests sorted by ascending payback period

2006 2007

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 ~$0.037-0.015/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

What is the Section 9007 Program?

grants guaranteed loans2005 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 andEnergy 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

Aug-13 Sep-13 Oct-13 Nov-13 Dec-13 Jan-14 Feb-14 Mar-14 Apr-14 May-14 Jun-14 Jul-140.0

500.0

1000.0

1500.0

2000.0

2500.0

3000.0

3500.0

4000.0

4500.0

actual kWh projected kWh

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 cost Simple Payback Years

Total Project Cost $70,030 $70,030 18.2Federal Tax credits (30%) $21,009 $49,021 13.6

USDA REAP grant (25%) $17,508 $31,514 10.0

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

PV Solar Market Penetration vs. PV Solar price

Questions:Go to www.nppd.com for additional information

or contact:

Ron Rose, Energy Efficiency Consultant

(402) 362–7326 rvrose@nppd.com