Reduce Electricity Bills From Irrigation Pumping: 9 Ways

An irrigation pump is one of the quietest ways to lose money on a farm. It runs at two in the morning. It runs while you are cutting hay. And it keeps running whether the impeller is in good shape or worn to the point where it moves 20 percent less water for the same power draw. Most growers do not notice until the July bill arrives.

Here is the encouraging part. If you want to reduce electricity bills from irrigation pumping, most of the savings are not locked behind a big capital purchase. Oregon State University Extension estimates that about 25 percent of the electricity used for irrigation pumping is wasted through poor pump efficiency, excess pressure, worn components, and mismatched equipment. The USDA National Agricultural Statistics Service put on-farm energy costs for pumping irrigation water at $3.3 billion in its 2023 Irrigation and Water Management Survey. A meaningful share of that is recoverable with a pressure gauge, a pump test, and a closer read of your rate schedule.

This guide covers where the money actually goes, how to work out your own cost per acre-inch, and which fixes pay for themselves in one season instead of five.

Quick answer To reduce electricity bills from irrigation pumping, you only have two real levers: total dynamic head and pumping hours. Attack both. Test the pump and correct or rebuild the impeller, strip out any pressure the sprinklers do not need, repair leaks and worn nozzles, schedule irrigation from soil moisture or evapotranspiration data instead of the calendar, and move run time out of your utility’s peak demand window. Farms that work through all five commonly cut irrigation electricity costs by 20 to 40 percent. The first three steps cost very little, and the diagnostic work can be done with a pressure gauge and one afternoon.

Where the Money Goes on an Irrigation Power Bill

Before you change anything in the field, read the bill properly. Most irrigation accounts are billed on three separate lines, and each one responds to a different fix. Growers who look only at the total dollar figure often chase the wrong problem for years.

Figure 1. The three charges on a typical electric irrigation account. 

The energy charge

This is the cents-per-kilowatt-hour line, and it tracks how much water you moved and how hard the pump had to work to move it. Everything about head, pump condition, and irrigation scheduling lands here. On most irrigated farms it is the largest single component.

The demand charge

Demand is measured in kilowatts, not kilowatt-hours. It reflects the highest rate of power draw during the billing period, regardless of how long that draw lasted. Utilities bill it in one of two ways. Some apply a flat rate against connected motor horsepower, so a 20 horsepower motor on a $15 per horsepower schedule carries a $300 charge whether the pump ran 10 hours or 300. Others read the meter in 15-minute intervals and bill the single highest interval average for the month.

Two details catch people out. First, a ratchet clause means a peak you set once can follow your bill for the rest of the season or even the year. Second, starting two pumps at the same moment can set a peak that neither pump would have set alone. Both are avoidable with scheduling rather than hardware.

The fixed or meter charge

A service or facilities charge that applies whether the pump runs or not. Some rural cooperatives bill irrigation accounts only across the pumping season and spread the fixed cost over those months, which makes the summer bills look worse than they are. Nothing you do in the field changes this line, so budget for it and move on. If you are building a season plan, the farm budget planner is a reasonable place to slot these fixed costs.

Total Dynamic Head Explains Almost Everything

Every kilowatt-hour on the energy line pays for one thing: lifting and pressurizing water. Engineers bundle that work into a single number called total dynamic head, or TDH, measured in feet.

The formula Total dynamic head = pumping water level + friction losses + pressure required at the sprinkler or emitter Pressure converts to head at 1 psi = 2.31 feet. So 45 psi at the pump discharge is about 104 feet of head on its own.

Figure 2. The three components of total dynamic head on a typical well and pivot system. 

Two rules of thumb are worth memorizing, because they let you price a decision in your head while standing in the field:

• Every 10 feet of unnecessary head costs roughly 1.3 kWh per acre-inch pumped.
• Every 10 psi of unnecessary pressure costs roughly 3 kWh per acre-inch pumped.

Put that in dollars. A 120-acre pivot applying 15 inches over a season moves 1,800 acre-inches. Carrying 10 psi more than the sprinklers need burns about 5,400 extra kilowatt-hours, or roughly $650 at 12 cents per kWh. That is a nozzle and regulator decision, not bad luck.

Lift is the component most growers underestimate, because it changes. Drawdown deepens through the season, and a well pumped harder than it can yield will show a steadily rising pumping water level and a steadily rising bill. If your system draws from a canal or ditch instead, the canal water measurement calculator helps you establish the flow baseline you need before any of this math works.

How to Calculate Your Pumping Cost Per Acre-Inch

Cost per acre-inch is the only number that lets you compare this year against last year, or one well against another. Dollars per month tells you nothing, because the weather changes. Here is the calculation, using the widely cited Nebraska Pumping Plant Performance Criteria as the benchmark. Kansas State University Research and Extension publishes the same criteria in its guide to comparing irrigation energy costs.

Step 1: Find total dynamic head

Measure the pumping water level while the pump is running, read the discharge pressure at the pump, convert psi to feet by multiplying by 2.31, and add an allowance for friction in the column and pipeline.

Step 2: Convert to water horsepower-hours

Water horsepower-hours whp-hours = acre-inches pumped × total dynamic head ÷ 8.75

Step 3: Compare against the benchmark

An electric pumping plant that meets the Nebraska criteria delivers 0.885 water horsepower-hours per kilowatt-hour, which works out to an overall wire-to-water efficiency of roughly 66 percent once motor, drive, and pump losses are counted. Divide your whp-hours by 0.885 to get the kilowatt-hours a well-matched plant would have used.

Step 4: Read your meter and rate yourself

Performance rating = benchmark kWh ÷ actual kWh × 100. A shortcut worth writing on the pump house wall: kWh per acre-inch is about 0.129 × TDH, divided by your performance rating.

Worked example: 120-acre pivot Pumping water level 120 feet. Discharge pressure 45 psi, which is 104 feet. Column and pipeline friction 10 feet. Total dynamic head = 234 feet. Water applied: 15 acre-inches per acre across 120 acres = 1,800 acre-inches. Whp-hours = 1,800 × 234 ÷ 8.75 = 48,140 Benchmark energy = 48,140 ÷ 0.885 = 54,400 kWh Meter reading for the season = 72,500 kWh, so the performance rating is 75 percent. The gap is 18,100 kWh. At 12 cents per kWh that is about $2,170 a year going nowhere, on one well.

University of Nebraska surveys have repeatedly found pumping plants using 30 to 50 percent more energy than the criteria predict, while relatively new and well-matched plants test at 82 to 92 percent. Nebraska researchers estimated that bringing the state’s pumping plants up to standard could save around 25 to 30 percent of irrigation pumping energy statewide. If your own rating lands below about 85 percent, a professional pump test will pay for itself quickly.

Figure 3. Energy required per acre-inch rises with head, and a worn pump adds a third again on top.

The table below turns the same math into numbers you can look up. Costs assume 12 cents per kilowatt-hour, so scale them to your own rate.

Total dynamic head	kWh per acre-inch (efficient plant)	kWh per acre-inch (75% rating)	Cost per acre-inch at 75% rating
50 feet	6.5	8.6	$1.03
100 feet	12.9	17.2	$2.07
150 feet	19.4	25.8	$3.10
200 feet	25.8	34.5	$4.13
250 feet	32.3	43.1	$5.17
300 feet	38.8	51.7	$6.20

Running these numbers by hand once is useful. After that, the irrigation pump selection and power calculator will size the head and horsepower for you, and the water use efficiency calculator shows how much of what you pumped actually reached the crop.

A Seven-Step Walk-Through to Find the Waste

You do not need a consultant to find the first round of savings. Work through this in order, and stop when the numbers tell you something.

1. Pull three seasons of bills. Separate the energy charge from the demand charge and the fixed charge. Note the peak kW recorded each month. Ask your utility for interval data if the bill does not show it.
2. Measure the pumping water level. Use an airline, a sounder, or a pressure transducer, and take the reading while the pump is running, not after it shuts off. Record the date, because this number moves through the season.
3. Put a gauge on the pump discharge. Then put a second gauge at the pivot point or at the last sprinkler on the line. The difference tells you what the pipeline is costing you in friction.
4. Measure flow. A flow meter is best. A totalizer reading, or a bucket-and-stopwatch check on a single sprinkler multiplied out, will get you close enough to start.
5. Calculate the performance rating. Use the four steps above. Write the result and the date in the pump records.
6. Walk the system while it runs. Look for leaks at the pivot point and along the drops, wet spots or sinkholes over a buried mainline, worn nozzles throwing the wrong pattern, missing or stuck pressure regulators, and an end gun watering a road, a ditch, or the neighbor’s fence line.
7. Book a professional pump test if the rating is below about 85 percent. Oklahoma State University Extension covers what a proper test measures in its guide to irrigation pump system testing, and Colorado State University Extension explains how the results are interpreted in irrigation pumping plant efficiency.

Changes That Cost Nothing

Start here. These four cost no capital and can be in place before the next irrigation.

Stop irrigating on the calendar

Scheduling is the cheapest energy efficiency measure on any farm, because every inch you do not apply is an inch you do not pay to pump. Demonstration work in central Nebraska found that monitoring soil water and crop water use saved 1.5 to 2 inches per season. On the 234-foot pivot in the example above, 2 inches across 120 acres is roughly 7,300 kilowatt-hours, or about $875.

You need two inputs: how much water the crop is using, and how much is already in the soil. The crop water requirement calculator and the evapotranspiration calculator handle the first. The soil moisture deficit calculator handles the second. If you want the reasoning behind the numbers, our guide on how to calculate water needs per crop per week walks through a full season. Checking the forecast before you start a set matters too, and reading a weather forecast for farming decisions is a skill worth sharpening when a two-day delay could save a full pass.

Turn off the end gun where it is not paying

An end gun is the highest-pressure device on a pivot and often the least efficient. If it is watering a road, a waterway, or a corner you never harvest, the booster pump running to support it is pure loss. End gun controls that shut it off outside the field boundary are standard equipment on modern panels and are a common retrofit.

Stagger pump starts and shift run time

If two or three pumps start together, they set a peak that shows up on the demand line for months. Staggering starts by 15 or 20 minutes costs nothing. Where a time-of-use rate applies, moving hours into the overnight window can reduce the energy rate as well, and night irrigation usually loses less water to wind drift and evaporation, so more of what you pump reaches the root zone.

Stop valving back at the well

Throttling a valve to knock pressure down is one of the most common causes of poor pumping plant performance, and it is one of the most expensive. The pump is still producing the head; you are simply burning it across a valve. The right fix is to adjust or trim the impeller so the pump produces the head the system actually needs.

Repairs and Retrofits With the Shortest Payback

Pump test, impeller adjustment, and rebuild

On a deep-well turbine, impeller clearance drifts out of adjustment as thrust bearings wear and the shaft settles. Sand pumping erodes impeller vanes. Both reduce output for the same power draw, and both are invisible from the surface. A test typically runs a few hundred dollars. An impeller adjustment can be an afternoon of work. A full bowl rebuild is a larger job, but on a well pumping 1,800 acre-inches a year, recovering 15 points of efficiency is worth thousands of kilowatt-hours annually.

Oregon State University Extension recommends having a qualified pump professional test the system every three to five years, and any time the system changes. University of Georgia Extension covers the same ground for the Southeast in its bulletin on irrigation pumping plants and energy use.

Convert to a low-pressure sprinkler package

This is usually the biggest single energy win available on an older pivot. High-pressure impact sprinklers on top of the pipe may need 60 to 80 psi. Low-pressure spray heads, rotators, and wobblers on drops run at 10 to 25 psi with regulators, and LEPA bubblers can operate as low as 6 psi at the outlet. University of Nebraska research found that dropping a pivot from 80 psi to 40 psi saves about 11.7 kilowatt-hours for every acre-inch pumped, and that reduced-pressure systems can use around a third less energy than high-pressure equivalents.

Figure 4. Excess pressure has a straight-line price. Every 10 psi costs about $650 a season on this example system.

Two honest cautions come with the conversion. Low-pressure heads concentrate the same volume of water over a smaller wetted area, so the instantaneous application rate goes up. On sloping ground or tight soils that can cause runoff, which wipes out the energy saving by reducing how much water actually infiltrates. Nebraska studied this over four years and found the erosion risk real on fine-textured soils with slope. Boom-backs, wider spacing, residue cover, and reservoir tillage all help. Our guide to mulch for water conservation and weed control covers the surface management side.

The second caution is that the pump must be re-matched afterward. Nebraska Extension’s bulletin on converting center pivot sprinkler packages makes the point directly: a pump left unchanged after a pressure reduction can slide away from its best efficiency point, and the efficiency loss can partly cancel the pressure saving. Budget for an impeller trim or a bowl change in the same project.

Right-size the pump and the pipeline

Friction loss is the least glamorous item on the list and usually the smallest, but it is worth checking on long runs. Moving 800 gallons per minute through 1,000 feet of 8-inch PVC costs about 9.5 feet of head. The same flow through 10-inch pipe costs about 3 feet. The 6.5-foot difference is roughly 1,500 kilowatt-hours a year on an 1,800 acre-inch system, or about $175. That will not justify replacing a good pipeline, but it should absolutely shape the decision when you are installing a new one.

If you are weighing a capital upgrade rather than a repair, run it through the farm equipment ROI calculator before you commit, and check the effect on your cost of production per acre.

When a Variable Frequency Drive Pays and When It Does Not

Variable frequency drives get recommended more often than they deserve. A VFD slows the motor so the pump produces only the flow and pressure the system needs at that moment. That is genuinely valuable when demand varies. It is close to worthless when it does not.

A single well feeding a single pivot at a constant flow and constant pressure is already operating at one point on the curve. Adding a drive introduces a small conversion loss and saves nothing, because there is no variation to absorb. Utah State University Extension’s guide to variable frequency drives for irrigation pumps sets out the situations where the economics do work:

• One pump serving several zones or sets with different flow and pressure requirements.
• Multiple pumps feeding a shared mainline, where output needs to follow changing demand.
• Systems that need a soft start to prevent water hammer or an inrush penalty.
• Sites where single-phase to three-phase conversion is needed anyway.
• Cases where a drive is cheaper than replacing or reconditioning an aging pump.

Drip and micro-irrigation blocks are the classic good fit, because zones cycle and demand genuinely changes. If that describes your operation, the drip irrigation system designer is the right starting point, and our comparison of drip and sprinkler irrigation efficiency covers the trade-offs. Ask your utility about drive rebates before you buy; many offer them.

Cutting the Demand Charge, Not Just the Kilowatt-Hours

On some irrigation accounts the demand charge is a third of the bill, and none of the efficiency work above touches it directly. It responds to a different set of moves.

• Never start two pumps together. Program a delay into the panels. A 15-minute offset can drop the billed peak substantially at zero cost.
• Use soft starters or drives where inrush sets the peak. Across-the-line starting on a large motor can register a demand spike that determines the whole month.
• Check for a ratchet clause. If your utility bills the highest demand from the past 11 months, one careless afternoon in June can be paid for until the following spring.
• Ask about interruptible and load control rates. Many cooperatives and investor-owned utilities offer a lower demand rate, or a per-horsepower incentive payment, in exchange for the ability to shut pumps off during a few peak hours. Entergy Arkansas, Idaho Power, and numerous rural cooperatives run programs of this kind, typically with control windows in the late afternoon.
• Confirm whether your rate is seasonal. Some schedules bill irrigation demand only in the pumping months. Others carry it year-round, which changes whether an idle pump is costing you anything.

If interruptions worry you, plan for them rather than avoiding the program. Our guide on how to irrigate during power outages covers the backup options, and most load control programs give notice and limit the number of events per season.

Does Solar Make Sense for Irrigation Pumping?

Sometimes, but almost never as the first move. Solar reduces or eliminates the energy charge, and it does nothing about a worn impeller, 20 psi of surplus pressure, or three unnecessary irrigations. Sizing an array to feed an inefficient pump means paying full price for wasted electricity, just up front instead of monthly.

Fix the efficiency first, then size the array to the new, smaller load. That order routinely cuts the required system size by a quarter or more. Two other points matter. Solar output peaks at midday, which may or may not line up with when you want to irrigate, and it will not help with a demand charge unless the array is paired with storage or your utility credits exports. On the other hand, in regions where load shedding and unreliable supply are the real constraint rather than price, solar pumping solves a reliability problem that efficiency work cannot.

Our full analysis of whether solar powered irrigation is worth the investment works through current payback periods. To size a system, use the solar panel for farm power calculator, and to compare it against control and scheduling upgrades, the smart irrigation ROI calculator puts them on the same footing.

Savings, Cost, and Payback at a Glance

The ranges below reflect typical outcomes reported by extension programs and utility efficiency programs. Your own numbers will depend on head, hours, and rate, so treat these as a way to rank the options rather than a promise.

Figure 5. Typical energy savings by measure on an electric irrigation system. 

Measure	Typical energy saving	Indicative cost	Typical payback
Scheduling with soil moisture or ET data	10% to 20%	$0 to $3,000	Under 2 seasons
Repairing leaks, worn nozzles, stuck regulators	3% to 10%	Under $500	Weeks
Pump test plus impeller adjustment	10% to 25%	$300 test, $500 to $2,000 adjustment	1 to 2 seasons
Bowl rebuild or pump replacement	15% to 30%	$4,000 to $15,000	2 to 5 years
Low-pressure sprinkler package conversion	15% to 30%	$8,000 to $20,000 per pivot	3 to 7 years
Staggered starts and off-peak scheduling	5% to 25% of the bill	$0 to $2,000	Under 2 seasons
Variable frequency drive, variable demand only	0% to 30%	$5,000 to $20,000	3 to 8 years
Upsizing an undersized mainline	1% to 5%	Varies widely	Long, justify on new builds
Solar array sized after efficiency work	Offsets the energy charge	High capital	5 to 12 years

Two federal routes can reduce the capital cost. The USDA Natural Resources Conservation Service funds an energy audit, called an Agricultural Energy Management Plan, through the EQIP On-Farm Energy Initiative, and cost-share for the retrofits the audit identifies. USDA Rural Development’s Rural Energy for America Program has historically funded efficiency and renewable projects, though eligibility and funding rounds change, so confirm the current status with your state Rural Development office before you build a budget around it. Many utilities also run their own rebates. If financing is part of the plan, the farm loan and EMI calculator will show what the repayment does to your per-acre cost.

Common Mistakes That Keep Irrigation Bills High

• Judging performance by the monthly total. A hot, dry July always costs more. Track kilowatt-hours per acre-inch instead, and the trend will tell you when something has changed.
• Changing the sprinkler package without changing the pump. The pressure comes down, the pump slides off its best efficiency point, and half the expected saving disappears.
• Throttling a valve to control pressure. You are paying for head and then destroying it. Adjust the impeller instead.
• Ignoring the demand line. No amount of efficiency work will fix a peak set by two motors starting at once.
• Buying solar before fixing efficiency. You end up paying capital cost for waste.
• Assuming a new pump is an efficient pump. New equipment matched to the wrong operating point performs badly from day one.
• Skipping flow measurement. Without gallons per minute you cannot calculate anything, and a well that has lost yield will look like a pump problem.
• Over-pumping the well. Pulling more than the aquifer delivers deepens drawdown, raises lift, and raises the bill every hour thereafter. Chronic over-application in arid regions also worsens soil salinity, which our guide to salinity management in irrigated agriculture addresses in detail.

Expert Tips From the Field

• Log kilowatt-hours per acre-inch every season and keep the record with the pump file. It is the earliest warning you will get that an impeller is wearing.
• Take your pressure reading at the last sprinkler, not just at the pivot point. That is where the system either has enough pressure or does not.
• Photograph the motor nameplate and keep a copy of the pump curve. Both will be the first things a technician asks for.
• Schedule the pump test late in the season, when the water table is at its lowest and the numbers reflect the worst case.
• Ask your utility for 15-minute interval data. It is usually free and it shows exactly which starts are setting your peak.
• Before authorizing an impeller trim, ask to see where the new operating point falls on the curve. A trim that lands outside the efficient band solves one problem and creates another.
• Flush and inspect filters on drip systems regularly. Clogging raises the pressure required upstream, and our field guide to fixing a blocked drip emitter covers the diagnostics.
• Check whether your utility applies a power factor penalty. Correcting it with capacitors is often cheap and shows up on the next bill.

Frequently Asked Questions

How much can I realistically save on irrigation electricity?

Most farms that combine better scheduling, a pump test, and pressure reduction cut irrigation electricity costs by 20 to 40 percent. Scheduling alone typically saves 10 to 20 percent, correcting a worn pump saves 10 to 25 percent, and converting to a low-pressure sprinkler package saves 15 to 30 percent. The savings are not fully additive, because each one shrinks the base the next one works on.

How do I know if my irrigation pump is inefficient?

Calculate your performance rating: benchmark kilowatt-hours divided by actual metered kilowatt-hours. Below about 85 percent of the Nebraska criteria, a professional test is justified. Other warning signs are kWh per acre-inch rising year over year, pressure at the end of the system falling below design, sand in the discharge, and a pump that has not been touched since a sprinkler package change.

How often should an irrigation pump be tested?

Every three to five years under normal conditions, and immediately after any change to nozzles, operating pressure, well depth, or field acreage. Pumping water level and impeller wear both drift over time, so a plant that tested well five years ago may not test well today.

Is it cheaper to irrigate at night?

Often, for two separate reasons. If you are on a time-of-use rate, overnight kilowatt-hours cost less. Independently of the rate, night irrigation loses less water to evaporation and wind drift, so more of what you pump reaches the root zone and fewer total inches are needed. Check your specific rate schedule, because not every irrigation tariff has a time-of-use component.

What is a demand charge on an irrigation bill?

It is a charge based on the highest rate of electricity draw during the billing period, measured in kilowatts, or in some cases a flat charge per connected motor horsepower. It is separate from the energy charge and is not reduced by running fewer hours. Staggering pump starts, using soft starters, and joining a load control program are the effective ways to lower it.

Does a variable frequency drive always save money on an irrigation pump?

No. A VFD saves energy where flow or pressure demand varies, such as a pump serving multiple zones or several pumps on a shared mainline. On a single pump running one pivot at constant flow and pressure, a drive adds a small conversion loss and saves little or nothing. Evaluate the operating pattern before buying.

How much does excess pressure actually cost?

About 3 kilowatt-hours per acre-inch pumped for every 10 psi carried above what the sprinklers need. On a 120-acre pivot applying 15 inches, that is roughly 5,400 kilowatt-hours, or about $650 a season at 12 cents per kilowatt-hour.

Will switching to drip irrigation lower my electricity bill?

Usually yes, because drip operates at far lower pressure than sprinklers and applies fewer total inches to achieve the same crop water supply. The offsets are filtration, which adds head, and flushing cycles, which add run time. On high-value row crops and orchards the net saving is normally clear; on low-value broadacre crops the capital cost is the deciding factor.

Are there grants or rebates for irrigation energy efficiency?

Yes. USDA NRCS funds an on-farm energy audit and cost-shares the resulting efficiency retrofits through EQIP. USDA Rural Development has historically offered grants and guaranteed loans through the Rural Energy for America Program, though funding rounds and eligibility change, so verify the current position with your state office. Many electric utilities and cooperatives also offer rebates for pump upgrades, drives, and low-pressure conversions.

The Bottom Line

Reducing electricity bills from irrigation pumping comes down to a short list of questions. How high is the head, and how much of it is genuinely necessary? How efficiently is the plant converting kilowatt-hours into water horsepower? How many inches are you applying that the crop never needed? And what is your utility charging you for the peak you set rather than the energy you used?

Answer those four with a gauge, a flow reading, and three years of bills, and the priority list writes itself. In most cases the sequence is: schedule properly, fix the leaks and worn parts, test the pump, then reduce pressure, and only then consider a drive or a solar array. Working in that order means every dollar of capital gets spent against a load you have already made as small as possible.

Next step Start with one well. Measure the pumping water level and discharge pressure, calculate your kilowatt-hours per acre-inch with the irrigation pump selection and power calculator, and compare it against the table in this guide. If you are more than 15 percent off the benchmark, book a pump test before next season. For more tools and guides, browse our irrigation and water resources and the full farm calculator library.