--- title: "Well Rehabilitation ROI: Why Your Power Bill Might Go Up After a Rehab (and Why That's Good News)" description: How to measure well rehabilitation ROI with wire-to-water efficiency, specific energy, and cost per unit of water, with a worked example and why total kWh is the wrong number. image: https://airbursttechnology.com/hubfs/Figure%201.2-1.jpg --- [Go Back Up](https://airbursttechnology.com/resources/well-rehabilitation-roi-why-your-power-bill-might-go-up-after-a-rehab-and-why-that-s-good-news#top) [Skip to Content](https://airbursttechnology.com/resources/well-rehabilitation-roi-why-your-power-bill-might-go-up-after-a-rehab-and-why-that-s-good-news#body) [![AB-Logo-WHT-CLR-Symbol-SML](https://airbursttechnology.com/hs-fs/hubfs/AirBurst%20Logos%20Final/AB-Logo-WHT-CLR-Symbol-SML.png?width=225&height=34&name=AB-Logo-WHT-CLR-Symbol-SML.png "AB-Logo-WHT-CLR-Symbol-SML")](https://airbursttechnology.com/) Toggle Menu - [Technology](https://airbursttechnology.com/technology) Toggle children for Technology Main Menu (Press to Return) \> Technology - [Applications](https://airbursttechnology.com/applications) - [CasingGuard™ Well Repair](https://casingguard.com) - [Licensing](https://airbursttechnology.com/airburst-technology-licensing) - Resources Toggle children for Resources Main Menu (Press to Return) \> Resources - [FAQ](https://airbursttechnology.com/airburst-technology-faqs) - [Results + Insights](https://airbursttechnology.com/resources) - [Deep Education](https://airbursttechnology.com/education) - [Return-on-Rehab Estimator](https://ror.airbursttechnology.com) - [Licensee Portal](https://ls-portal.airbursttechnology.com) - [About Us](https://airbursttechnology.com/airburst-technology-about-us) Toggle children for About Us Main Menu (Press to Return) \> About Us - [AirBurst® Locations](https://airbursttechnology.com/airburst-locations) - [Contact](https://airbursttechnology.com/contact-us) - [Easy Button](https://airbursttechnology.com/contact-us) - Open Search Search Submit Search # Well Rehabilitation ROI: Why Your Power Bill Might Go Up After a Rehab (and Why That's Good News) [Well Rehabilitation](https://airbursttechnology.com/resources/tag/well-rehabilitation) [AirInsights](https://airbursttechnology.com/resources/tag/airinsights) Nov 5, 2026, 1:17:06 PM [AirBurst Experts](https://airbursttechnology.com/resources/author/airburst-experts) 7 min read ![Power vs flow for a clogging well with a variable frequency drive (VFD) and a fixed-speed control.](https://airbursttechnology.com/hs-fs/hubfs/Figure%201.2-1.jpg?width=1000&name=Figure%201.2-1.jpg) [mailto:?subject=Well%20Rehabilitation%20ROI%3A%20Why%20Your%20Power%20Bill%20Might%20Go%20Up%20After%20a%20Rehab%20%28and%20Why%20That%27s%20Good%20News%29&body=https%3A%2F%2Fairbursttechnology.com%2Fresources%2Fwell-rehabilitation-roi-why-your-power-bill-might-go-up-after-a-rehab-and-why-that-s-good-news](mailto:?subject=Well%20Rehabilitation%20ROI%3A%20Why%20Your%20Power%20Bill%20Might%20Go%20Up%20After%20a%20Rehab%20%28and%20Why%20That%27s%20Good%20News%29&body=https%3A%2F%2Fairbursttechnology.com%2Fresources%2Fwell-rehabilitation-roi-why-your-power-bill-might-go-up-after-a-rehab-and-why-that-s-good-news) **Short answer:** A badly plugged well (with a fixed-speed pump) often looks cheap to run because it is barely moving water, and a pump only draws real power when it is moving water. After a rehabilitation, the same well can pump more total water, draw more total power, and still cost far less per gallon. The correct measure of well rehabilitation ROI is not the monthly electric bill. It is specific energy (kilowatt-hours per unit of water) and the wire-to-water efficiency behind it, converted to dollars using the owner's real electricity rate. If you have ever had a client call after a rehab to complain that their power bill went up, this post is for them. And for you. ## The counterintuitive truth about plugged wells and power A plugged well is a well in which the formation cannot deliver water to the pump fast enough. The water level draws down deeper and deeper to squeeze out fewer gallons. That is bad for the owner. But here is what it does to the power bill: **On a fixed-speed pump**, flow drops as the well plugs, and power drops with it, because the pump is doing less work. A plugging fixed-speed well looks like a slow fade: less water, less power, deeper drawdown. The bill actually gets smaller. **On a VFD pump**, the drive ramps up to hold its flow or pressure setpoint, drawing down deeper and consuming more power to muscle against the plugging. The bill gets bigger. Same disease, opposite power trends. Which means you cannot read an electric bill without first knowing how the pump is controlled, and you certainly cannot judge a rehab by whether the bill went up or down. You need a number that is normalized per gallon. ## The three numbers that measure well rehabilitation ROI ### 1. Wire-to-water efficiency Wire-to-water efficiency is the ratio of useful hydraulic work the system delivers (lifting water) to the electrical power it draws, measured from the wire (electricity in) to the water (lifted out). **Wire-to-water efficiency (%) = water horsepower ÷ input power × 100** **Water horsepower (HP) = (Q \[gpm\] × TDH \[ft\]) ÷ 3,960** Q is the pumping rate and TDH is total dynamic head in feet: the pumping water level (not static) plus friction losses in the column and discharge piping plus discharge pressure converted at 1 psi = 2.31 ft. Input power is the actual electrical power the system pulls, converted at 1 HP = 0.746 kW. A brand-new, well-matched pump might hit 60 to 75%. A worn, poorly matched, or badly loaded system can sag well below that. We have documented wire-to-water jumps from the high teens into the 40s on badly plugged deep wells after rehabilitation, and that before/after is one of the most convincing stories you can tell. Plain-English version for a client: wire-to-water efficiency is how much of the electricity you are paying for actually turns into water at the surface. Think of it as miles per gallon for your pumping system. If it is low, you are buying a lot of power and only getting a little water for it, and that shows up on your electric bill every month. Why does a rehab move it? Restored porosity means shallower drawdown for the same yield. Shallower drawdown means less total dynamic head. Less head means the pump operates nearer its design point and wastes less power on lift. ### 2. Specific energy Specific energy is the amount of energy it takes to produce one unit of water: **Specific energy = energy consumed (kWh) ÷ water produced (per 1,000 gallons, acre-foot, or whatever unit the client bills in)** This is the crucial reframing. Many clients fixate on total electricity consumption, but total power is a misleading target. A badly plugged well that barely pulls water from the aquifer does not consume much power because it is barely doing anything. Specific energy cuts through the confusion by measuring energy per gallon, not energy total. The way we say it: do not judge the well by your total power bill; judge it by how much power it takes to make a thousand gallons. A clogged well can look cheap on power simply because it is barely making water. Once we clean it, it might use more electricity overall because it is finally producing again, but each gallon costs you less energy than before. ### 3. Dollars per unit of water This is specific energy translated into money: **Cost per unit ($) = specific energy (kWh/unit) × electricity rate ($/kWh)** Nobody approves a budget based on gallons per minute per foot of drawdown. They approve it based on money. When you can say "before the rehab you were paying X dollars per acre-foot to pump this well, and after you are paying Y," the value is undeniable. Multiply the per-unit saving by annual production and you have an annual dollar figure and a payback period. Use the client's actual blended electricity rate or time-of-use schedule from a real utility bill, not a national average. Their real rate is what makes the number credible when they check it against their own statement. And remember that many commercial customers pay demand charges on top of energy charges; be clear about which costs you are including. ## A worked example A municipal well makes 500 gpm and runs about 4,000 hours a year, roughly 120 million gallons. It draws 50 kW, so it burns about 200,000 kWh a year. At $0.12 per kWh, that is $24,000 in electricity. Specific energy before: 200,000 kWh ÷ 120,000 thousand-gallons = 1.67 kWh per 1,000 gallons, or about $0.20 per 1,000 gallons. A rehab lifts wire-to-water efficiency from 47% to 62%. Input power drops to about 38 kW for the same 500 gpm, so the annual bill drops to roughly $18,000. Specific energy after: about 1.27 kWh per 1,000 gallons, or about $0.15 per 1,000 gallons. That is $6,000 a year in energy alone, on a well that was still meeting demand. On a well that had lost capacity, the total bill after rehab might actually rise, because the well is now producing the water the owner needed, but the per-gallon cost still falls, and that is the number that matters. ## How to get an honest power measurement You need flow, total dynamic head, and input power. Flow and head come from a proper pump test. Input power can be gotten three ways, in rough order of accuracy. **Method A: read it from SCADA or the VFD.** If the facility has instrumentation, the drive already knows the kW it is drawing. One rule: use an average, not a snapshot. Let the well reach steady state, then average kW across a fifteen to thirty minute window at a stable rate and pull the flow from that same window. An instantaneous reading captures whatever the drive happened to be doing that second. Use the same window before and after. **Method B: measure it at the wellhead.** Put a clamp meter on the motor leads, read volts and amps, and calculate input power (for three-phase: kW = V × A × 1.732 × power factor ÷ 1,000). Power factor trips people up. A well-loaded submersible motor typically runs about 0.85 to 0.90; lightly loaded motors sag to 0.5 to 0.7. If your measured amps sit well below nameplate full-load amps, do not just drop 0.85 into the formula. You will overstate input power and understate the well's efficiency, which is the one direction of error that makes your rehab look worse than it was. **Method C: estimate from the pump curve.** Plot Q and TDH on the manufacturer's curve, read brake horsepower, and divide by motor efficiency. It is the least accurate because it assumes a factory-fresh pump. Here is how far apart they can land on the same well. With Q = 500 gpm and TDH = 250 ft, water horsepower is 31.6 HP, about 23.6 kW. The drive reports 47 kW in: 50% efficiency. The wellhead reading (460 V, 72 A, PF 0.87) works out to 49.9 kW: 47%. The pump curve estimate gives 37.7 kW: 63%. The two measured methods agree; the curve estimate is optimistic by more than ten points because it misses the wear the real measurement captures. Measure when you can; estimate only when you must. ## The pitfalls that make a real ROI look fake - **Comparing total kWh.** Always normalize per unit of water, and make sure "water produced" and "energy consumed" cover exactly the same time window. - **Reusing the "before" TDH.** A rehab that raises flow raises friction loss with it (head loss climbs with roughly the 1.85 power of flow). On a deep well with old steel column pipe, recalculate friction at the new rate, or you will flatter your after numbers. - **Ignoring the control type.** A power increase on a VFD well after rehab may simply be the drive finally reaching setpoint at a lower speed and higher efficiency; read it next to specific energy. - **Nameplate assumptions.** Total dynamic head must reflect actual pumping level and actual discharge pressure, not the numbers from the day the pump was installed. - **Testing an unrested well.** Every one of these metrics is built on a pump test, and a test that starts before the water level has fully recovered produces numbers that look reasonable and are quietly wrong. ## Stack the savings: off-peak pumping One more lever. A lot of utilities charge less for power during off-peak hours. A well efficient enough to meet demand in fewer hours gives the operator the flexibility to shift pumping into those cheaper windows. Same water, lower bill, twice. Turning that into a dollar figure means running the client's actual rate schedule against actual run hours, which is past napkin math but well within what a purpose-built model can do. ## Energy is usually not the whole ROI For most wells, the energy saving is the easiest part of the return to measure and the smallest part of the total. The larger returns are the capacity you protected: the replacement well you deferred, the purchased water you did not buy, the redundancy you kept. A rehab with a 7.5-year simple payback on energy alone can be the obviously right decision once those are counted over a ten-year horizon. Which is why we built the free Return-on-Rehab estimator at [ror.airbursttechnology.com](https://ror.airbursttechnology.com). Enter specific capacity, wire-to-water efficiency, specific energy, and your electricity rate, and it carries them across a multi-year horizon with performance drift and rate escalation, then reports breakeven year, cumulative savings, and net present value. Understanding the math above is exactly what lets you read its output critically and defend the number in front of a finance committee. ### Get the full field guide This article is adapted from *The Data-Driven Well Rehab*, AirBurst's free 60-page field guide for project managers: how to diagnose whether it's the pump, the well, or the aquifer; how to run a pump test you can trust; and how to prove a rehab's results in specific capacity, wire-to-water efficiency, and dollars. [Download the free ebook](https://airbursttechnology.com/info-form-data-driven-rehab) ## AirBurst Experts ## Ready to Transform your Business with Little Effort Using Brightlane? 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