The short answer
An energy performance contract (EPC or ESPC) lets a facility owner pay for efficiency upgrades from the energy savings those upgrades create instead of from a capital budget. A contractor (energy service company, or ESCO) designs and installs measures and typically guarantees a minimum level of savings. Payment is tied to verified savings measured against an agreed baseline, so the owner pays only for results that are documented and confirmed.
Key takeaways
- An EPC/ESPC converts avoided energy cost into a payment stream: the contractor recovers its investment from verified savings rather than an upfront fee.
- Savings are computed as baseline energy use minus measured post-project energy use, adjusted for independent variables such as weather, occupancy, and production.
- Measurement and verification (M&V) is the contractual backbone; agreed methods and roles determine how much the owner actually pays each period.
- In a guaranteed-savings model the ESCO compensates the owner if savings fall short, shifting performance risk away from the facility owner.
- Contracts should specify the baseline, performance period, payment share, valuation basis, adjustment factors, and reporting cadence before signature.
- Reliable metering and billing data are prerequisites; weak data raises M&V cost and the likelihood of disputes.
What an energy performance contract actually is
An energy savings performance contract is an agreement between a facility owner and a performance contractor. The contractor identifies, designs, and installs energy conservation measures and guarantees their performance. Because financing is typically arranged by the contractor and repaid from the energy savings those measures create, the owner can upgrade equipment and systems without dedicating capital budgets up front.
The model works because an owner continues paying its utility bills, but after the measures are installed it consumes less. The difference between what it would have paid without the project and what it pays in practice becomes the savings that funds the project. Depending on the contract, all savings may service the financing or the savings may be split between the finance payments and the owner.
The right project profile matters. A performance contract fits situations where the measures produce reliable, significant, and long-term energy-related cost savings, and where an organization can capture improvements across its whole stock of buildings. Jurisdictions differ: many U.S. public-sector programs are governed by specific enabling legislation, while private and international projects follow contract law plus widely used M&V protocols. Verify the rules that apply in your country before structuring a deal.
- The contractor (ESCO) carries design, installation, and often financing and maintenance.
- Savings can include energy, demand, water, and operations-and-maintenance cost reductions.
- Term typically runs 5–10 years for simple projects and can extend well beyond for deeper retrofits.
- Buyout provisions usually allow the owner to terminate early if financing is repaid.
Where the money comes from: baseline, savings, and payment
Payment is anchored to a baseline: the level of energy and operational cost that would have occurred without the project. Savings for a period equal the baseline energy use minus the measured post-project energy use for the same period, adjusted for independent variables such as weather, occupancy, operating hours, or production that change from year to year. If the baseline is set too high, the owner overpays; if set too low, the contractor is unfairly penalized, so baseline definition is one of the most negotiated clauses.
The baseline should be established and documented before the project begins, using historical utility data and interval metering where available. A strong baseline records not only consumption but the underlying drivers so that adjustments can be defended later. During the repayment period the parties compare actual consumption against the adjusted baseline to compute savings.
The valuation basis also matters. Savings are often measured in physical units (kilowatt-hours, therms, gallons) and then converted to money using agreed rates. Some contracts tie valuation to a fixed or escalating tariff, while others reference the owner's actual avoided utility cost. Choosing and documenting the basis up front prevents disagreements about how much a unit of saved energy is worth.
- Set the baseline before construction and document its underlying assumptions.
- Agree which independent variables trigger baseline adjustments and how they are measured.
- Define savings in physical units first, then assign a transparent monetary value.
- Specify who provides data, how often, and what happens if a meter fails.
Measurement and verification: the contract's backbone
Measurement and verification (M&V) is the process of confirming that promised savings actually occur. It is essential because the owner's payment depends on documented results rather than on the contractor's promises. International best practice, such as the International Performance Measurement and Verification Protocol (IPMVP), provides structured M&V options that let the parties balance accuracy against cost.
The IPMVP framework describes four broad options. Options A and B isolate individual efficiency measures: Option A uses spot or short-term measurement of key parameters with some stipulated values, while Option B relies on continuous or periodic measurement of the measure's performance. Options C and D look at the whole facility: Option C compares whole-building utility bills before and after, and Option D uses calibrated simulation. Choosing the wrong option can overpay for measurement or leave savings insufficiently proven.
Regulators and program managers emphasize that M&V must be designed before signature, not improvised after disputes arise. Good practice allocates roles clearly, defines reporting requirements, and specifies how savings are verified each year of the performance period. Independent verification of the contractor's reports adds confidence, especially on large public projects where scrutiny is high.
- IPMVP Option A: isolated measures, key parameters measured, others stipulated — lower cost, higher uncertainty.
- IPMVP Option B: isolated measures with ongoing measurement of all relevant parameters.
- IPMVP Option C: whole-facility comparison using utility billing data over time.
- IPMVP Option D: calibrated simulation, useful when whole-building data are unreliable.
- Define who performs M&V, who approves reports, and how disputes over results are resolved.
Allocating risk: guarantees, shared savings, and terms
Two common payment structures exist. In a guaranteed-savings model, the ESCO guarantees that savings will at least cover the agreed payments; if actual savings fall short, the ESCO compensates the owner for the difference. In a shared-savings model, the parties split the measured savings on an agreed ratio, and the ESCO's reward rises or falls with results. Guaranteed savings gives the owner more certainty; shared savings can be simpler to administer but shifts more performance risk onto the owner.
The performance period should reflect the payback of the installed measures. A simple project may pay back in five to ten years; larger retrofits can run twenty years or more. The term should not exceed the expected useful life of the upgraded systems. Contracts normally include buyout provisions and define what happens if the facility's use changes materially during the term.
Contract quality depends on details that are easy to overlook: who maintains the new equipment and keeps its warranties valid, how meter accuracy is assured, what happens if the owner adds or removes floor area, and how changes of scope are priced. Owners are advised to select an ESCO on track record and references rather than lowest bid, and to structure incentives so the contractor pursues comprehensive efficiency rather than quick, superficial measures.
- Guaranteed savings: ESCO pays shortfalls — more certainty for the owner.
- Shared savings: parties split measured savings — simpler but riskier for the owner.
- Keep the term within the useful life of the upgraded systems.
- Negotiate maintenance duties, warranties, meter accuracy, and scope-change pricing in writing.
- Require the ESCO to take a comprehensive approach rather than cherry-picking easy savings.
Deciding whether an EPC fits and preparing to sign
An energy performance contract is not always the best tool. If capital is cheap and available, a conventional design-build with direct procurement may cost less overall because it avoids financing and M&V overhead. EPC becomes attractive when budgets are constrained, when the organization wants to offload performance risk, or when it needs a single accountable party to deliver and maintain results across many facilities.
Preparation should begin with data, not with a request for proposals. Assemble at least a year of utility bills and interval data for every fuel and utility. Conduct or obtain a credible audit that identifies economically viable measures and estimates their savings. Only then is it realistic to set a defensible baseline, choose M&V options per measure, and draft the payment schedule.
The U.S. Department of Energy's Federal Energy Management Program provides detailed M&V guidelines for performance-based contracts, and EVO has published application guidance specifically for facility owners entering energy performance contracts. These resources are useful starting points even for organizations outside the public sector, though local law should always govern the final structure.
- Compare total cost of EPC financing against conventional capital procurement before committing.
- Start from reliable historical data; audit gaps before setting the baseline.
- Screen ESCOs on references, insurance, and experience with your facility type.
- Involve an in-house team to work with the contractor through design, build, and verification.
- Document both energy and non-energy benefits so the project's full value is visible.
Put it into practice
Pre-signing due-diligence checklist for an energy performance contract
Work through this checklist before you sign. Completing each item produces the documentation you will need to defend savings calculations and payment decisions throughout the performance period.
- Assembled at least 12 months of utility bills and interval data for every fuel, utility, and water service included in the project.
- Established and documented a defensible baseline with its adjustment factors and underlying assumptions.
- Defined exactly what counts as savings (energy, demand, water, O&M) and in which physical units.
- Selected an M&V approach per measure (for example IPMVP options A–D) and assigned roles for data collection and reporting.
- Agreed the guaranteed or shared savings level and specified who compensates whom for shortfalls.
- Set the performance period within the useful life of the upgraded systems and included buyout terms.
- Chose a transparent valuation basis and a mechanism for handling tariff or rate changes.
- Defined reporting cadence, data access, and who approves periodic savings reports.
- Allocated maintenance, warranty, meter-accuracy, and commissioning responsibilities in writing.
- Included scope-change and dispute-resolution procedures covering baseline adjustments.
- Specified how savings above the guarantee or target are shared.
- Verified the ESCO's credentials, references, insurance, and track record on similar facilities.
Questions people ask
Who pays if actual savings fall short of the guarantee?
In a guaranteed-savings model, the ESCO compensates the owner for the shortfall so that the owner's payments for the project are covered. This is the main reason owners choose a guaranteed structure: performance risk is transferred to the contractor. The exact mechanism — cash payment, credit against future fees, or deferral — is defined in the contract and depends on the verified savings each period.
What is the difference between guaranteed-savings and shared-savings contracts?
In a guaranteed-savings contract the ESCO promises that savings will at least cover the agreed payments and compensates the owner if they fall short, giving the owner predictable cost. In a shared-savings contract the parties split the measured savings on an agreed ratio, so the ESCO's reward and the owner's benefit both fluctuate with actual performance. Shared savings is administratively simpler but leaves more performance risk with the owner.
How is the baseline chosen and why does it matter so much?
The baseline is the estimated energy and operational cost that would have occurred without the project; it is normally set before construction using historical utility data and an audit. Savings are computed as baseline use minus measured post-project use. Because payment is proportional to this difference, an inflated baseline overpays the contractor and an understated one unfairly penalizes it, making the baseline one of the most contested clauses in the contract.
Which M&V option should I choose for my project?
It depends on the measures and the data you have. If you retrofit a few isolated systems such as lighting or a chiller, an isolation approach (IPMVP Option A or B) targets the measure directly. If many integrated measures affect whole-building consumption, a facility-level approach (Option C using utility bills, or Option D using calibrated simulation) is more appropriate. Trade accuracy against cost, and document the choice in the contract before work begins.
What happens if the building's use changes during the contract term?
Most contracts include adjustment provisions that recalculate the baseline for independent variables such as weather, occupancy, operating hours, or production. If the owner adds or removes significant floor area or changes how the building is used, the contract typically triggers a scope-change mechanism that adjusts the baseline and payment schedule. Pre-agreeing these triggers prevents disputes later, since unadjusted baselines quickly become unfair to one side.
Is EPC financing counted on the owner's balance sheet?
It depends on the structure, the jurisdiction, and applicable accounting rules. Some arrangements are structured to keep the financing off the owner's balance sheet, but accounting treatment is decided case by case based on who controls the asset, who bears the risks, and the terms of the agreement. Treat this as a question for your auditor and legal counsel rather than assuming a standard answer.
Sources and further reading
Sources were checked when this page was generated. Confirm changing dates, rules and prices with the original publisher.
- Постановление Правительства РФ № 636 «О требованиях к условиям энергосервисного договора (контракта)…»gkrfkod.ru (нормативная база)
- Статья 108 «Особенности заключения энергосервисных контрактов» Закона № 44-ФЗkiportal.ru (законодательство о закупках)
- M&V Guidelines: Measurement and Verification for Performance-Based Contracts, Version 5.0U.S. Department of Energy, Federal Energy Management Program
- Energy Savings Performance Contracts (overview)U.S. Department of Energy
- New IPMVP Application Guide: M&V and Energy Performance Contracting for Facility OwnersEfficiency Valuation Organization (EVO)
- Energy Savings Performance Contracts (ESPCs) and Related ModelsNational Association of State Energy Officials (NASEO)