An energy savings performance contract, or ESPC, is an agreement in which a private energy service company designs, finances, and installs facility upgrades at no upfront cost to the owner, then guarantees that the resulting reductions in energy use will be large enough to cover the project’s payments over the life of the contract. The owner keeps paying roughly what it used to pay for energy; the difference between the old utility bill and the new one goes to the contractor and its lender until the work is paid off. When the term ends, the owner keeps the equipment and the savings. Federal law caps these contracts at 25 years, and the average federal project runs about 17 years with roughly $15 million invested.
How the Financing and Guarantee Work
The defining feature of an ESPC is that it is budget-neutral. The organization does not appropriate new money, issue bonds, or draw on capital reserves. The energy service company, known as an ESCO, arranges third-party financing, installs the upgrades, and commits contractually to a specific level of annual energy cost savings. The owner then redirects its existing utility budget toward paying the ESCO and the lender.
Federal regulations require that guaranteed savings exceed the contractor’s debt service before the agency can take on the obligation, meaning the contract cannot be structured so the owner pays out more than it saves.1eCFR. 10 CFR Part 436 Subpart B – Methods and Procedures for Energy Savings Performance Contracting If actual savings fall below the guaranteed amount in a given year, the ESCO must make up the difference, typically by accepting lower payments in the following period.2U.S. Department of Energy. Resource for Auditing Energy Saving Performance Contracts That shifts the financial risk of underperformance from the facility to the contractor.
The capital itself comes from third-party lenders rather than the ESCO. For federal projects, rates track the market for government-backed debt. For state and local projects, the common vehicle is a tax-exempt lease-purchase agreement, structured as a lease-to-own so the organization takes full ownership of the equipment at the end. These agreements usually do not count as long-term debt on the balance sheet, and most include a non-appropriation clause that lets the organization cancel if its governing body does not fund the payments in a future budget.3Department of Energy. Financing Options
During the contract, most of the savings are already spoken for; they service the debt and cover the ESCO’s performance fees. After the contract ends, the full value of the ongoing savings stays with the owner.
Who the Parties Are
Three parties drive every ESPC. A fourth is required on federal projects.
The ESCO is the general contractor and the financial guarantor. It designs the project, arranges financing, manages construction, installs the equipment, and monitors performance for the life of the contract. If savings fall short for reasons within its control, the ESCO bears the cost.
The host facility is the owner: a federal agency, state government, school district, hospital system, or other large entity. It provides the site, historical energy data, and the legal commitment to pay the contract from its utility budget. The owner also operates the equipment day to day and must follow any maintenance program in the contract, because neglecting maintenance can void the savings guarantee.
A third-party lender, usually a commercial bank or a private investment firm that specializes in energy finance, provides the upfront capital and holds the note.
On federal projects developed under the Department of Energy’s indefinite-delivery, indefinite-quantity ESPC contract, the agency must also work with a DOE-approved project facilitator: an independent advisor who guides the acquisition team from the initial assessment through the review of the first annual measurement and verification report.4U.S. Department of Energy. Project Facilitators for Federal ESPC, UESC, and ESPC ENABLE Projects The facilitator’s independence from the ESCO is meant to protect the agency from overly optimistic savings projections.
How a Project Gets Built
Before a contract is signed, the owner needs a reliable picture of how much energy the facility currently uses. That usually means two to three years of utility bills, compiled to establish a consumption baseline: the amount the facility would have spent on electricity, gas, and water without any upgrades. Everything that follows is measured against that baseline. Facility staff also flag the obvious problem areas, whether that’s an aging chiller, thin insulation, or old lighting.
The centerpiece of the preparation phase is the Investment Grade Audit. In the IGA, the ESCO surveys the facility, identifies every viable efficiency measure, models the savings for each, and develops a detailed cost estimate.2U.S. Department of Energy. Resource for Auditing Energy Saving Performance Contracts The IGA also sets the project’s measurement and verification plan, which is how savings will be tracked once the equipment is running. Fees for a thorough IGA generally run between $0.25 and $0.50 per square foot.
Federal agencies pick their ESCO from the DOE Qualified List and issue a task order under the applicable IDIQ contract. Non-federal owners typically issue a Request for Proposal that lays out the facility’s needs, historical usage, peak demand, and any constraints on scheduling or building access.
After the IGA, the ESCO submits a final proposal with technical designs, equipment selections, a construction schedule, and the guaranteed savings figure. Federal ESPCs are firm fixed-price contracts.1eCFR. 10 CFR Part 436 Subpart B – Methods and Procedures for Energy Savings Performance Contracting Construction can involve anything from LED lighting and high-efficiency boilers to solar arrays and building automation. Timelines range from about six months for a straightforward lighting retrofit to two years or more for complex, multi-building projects. The ESCO manages every subcontractor, which is the practical appeal of the turnkey model: one point of accountability. When the work passes acceptance testing, the performance period begins and the annual payment obligation kicks in.
Measurement and Verification
Measurement and verification, or M&V, is how both sides confirm the project is actually delivering. Each year, the ESCO submits an M&V report comparing actual energy use against the baseline and documenting whether the guaranteed savings were achieved.5Department of Energy. Measurement and Verification Activities Required in the Energy Savings Performance Contract Process The owner reviews the report and, on federal projects, should send a government witness to the annual verification activities.
Most ESPCs use the International Performance Measurement and Verification Protocol, which offers four options ranging from spot measurements of individual components to whole-building utility analysis. Simpler measures like lighting often rely on stipulated savings, calculated from engineering estimates rather than metered after installation. Complex measures like HVAC upgrades or building controls usually require ongoing metering. M&V costs typically run about 3% of the total project cost.
One thing to watch: ending formal M&V typically ends the ESCO’s contractual savings guarantee. Owners who stop tracking savings mid-contract to save money can lose their protection if performance degrades later.
Who Maintains the Equipment
Day-to-day maintenance is one of the most negotiable pieces of an ESPC, and the choice has real consequences. The ESCO always bears ultimate responsibility for guaranteed performance, but the actual maintenance work can be done by the owner’s staff, the ESCO, subcontractors, or some mix.6Energy.gov. Recognizing and Assigning ESPC Risks and Responsibilities Using the Risk, Responsibility, and Performance Matrix
When the ESCO handles maintenance, it takes the associated risk and is paid for it through the contract. When in-house staff handle it, the owner absorbs both the expense and some performance risk. This is where projects often run into trouble: an owner agrees to do the maintenance to lower the contract price, then reassigns staff or trims the budget, the equipment degrades, and the guarantee is compromised. Regardless of who does the physical work, the ESCO defines the maintenance program, provides training, and verifies that maintenance is happening. Unfamiliar technologies like renewables or advanced controls tend to work better under ESCO maintenance; standard equipment the owner already knows how to service is a reasonable candidate to keep in-house.
What Happens If Savings Fall Short or the Contract Ends Early
The guarantee applies to the project as a whole, not measure by measure. If one upgrade underperforms and another overperforms, the ESCO meets its obligation as long as total savings hit the target.2U.S. Department of Energy. Resource for Auditing Energy Saving Performance Contracts When total savings fall short, the cause matters. If the ESCO’s equipment or workmanship is at fault, the ESCO restores performance and accepts reduced payments until the shortfall is made whole. If the shortfall comes from the owner’s own changes, such as a shift in building mission, altered operating hours, or adjusted temperature setpoints, the owner generally bears that risk and the contract may be modified. Persistent failures can escalate to withholding of contractor payments.
Federal ESPCs include the standard government convenience termination clause. If an agency terminates for convenience, the ESCO is entitled to payment for completed work, costs incurred on the terminated portion (including a reasonable profit), and settlement expenses like accounting and legal fees.7Acquisition.GOV. FAR 52.249-2 Termination for Convenience of the Government (Fixed-Price) Termination liability is capped by the cancellation ceiling set in the contract for that year.1eCFR. 10 CFR Part 436 Subpart B – Methods and Procedures for Energy Savings Performance Contracting Federal agencies must notify the appropriate congressional committees before awarding any ESPC with a cancellation ceiling above $750,000.
Tax Incentives, Even for Tax-Exempt Owners
Public and other tax-exempt owners can benefit from two federal tax mechanisms even though they don’t owe income tax themselves.
Under Section 179D, the energy efficient commercial building deduction can be allocated to the designer of qualifying improvements when the building is owned by a government or other tax-exempt entity.8Internal Revenue Service. Energy Efficient Commercial Buildings Deduction In an ESPC, the ESCO is typically the designer. Based on 2025 inflation-adjusted amounts, the deduction ranges from $0.58 to $1.16 per square foot for projects that do not meet prevailing wage and apprenticeship requirements, and from $2.90 to $5.81 per square foot for projects that do, with the larger figures corresponding to greater energy savings. The practical effect for the owner is that a deduction the ESCO can actually use can support more competitive pricing on the contract.
The Inflation Reduction Act’s “elective pay” mechanism, also called direct pay, lets tax-exempt and governmental entities receive the full cash value of certain clean energy tax credits. Eligible credits include the Section 48 energy investment credit, the Section 48C qualifying advanced energy project credit, and several renewable energy production credits.9Internal Revenue Service. Elective Pay and Transferability If an ESPC installs solar, geothermal, or other qualifying clean energy equipment on a government building, the agency can claim the credit as a cash refund by filing a return (typically Form 990-T) after completing pre-filing registration with the IRS. Credit amounts may be reduced if the project misses domestic content or prevailing wage and apprenticeship standards.
ESPC vs. Utility Energy Service Contract
ESPCs are easy to confuse with Utility Energy Service Contracts, or UESCs, which have a similar structure but a critical difference. A UESC is a contract between a federal agency and its serving utility, and the utility arranges financing for the efficiency or renewable work. The utility is not required to guarantee savings; repayment is based on estimated savings instead. The ESCO under an ESPC does guarantee savings and bears the financial consequences of underperformance. UESCs can be quicker to execute because the utility relationship already exists, but the agency carries more performance risk.
Legal Authority and Contract Length
Federal authority for ESPCs comes from 42 U.S.C. ยง 8287, which lets the head of any federal agency enter into multi-year contracts to achieve energy savings, with a maximum term of 25 years.10Office of the Law Revision Counsel. 42 USC 8287 – Authority to Enter into Contracts The implementing rules at 10 CFR Part 436 Subpart B set the competitive procurement procedures, require a guaranteed savings clause, mandate annual audits to verify performance, and govern cancellation ceilings and congressional notification.1eCFR. 10 CFR Part 436 Subpart B – Methods and Procedures for Energy Savings Performance Contracting The Federal Acquisition Regulation reinforces the framework, allowing agencies to contract with an ESCO for up to 25 years at no direct capital cost to the Treasury.11Acquisition.GOV. FAR 23.202 – Policy
State and local governments operate under their own ESPC statutes rather than the federal code. Maximum terms typically range from 15 to 35 years, and procurement rules vary; some states require competitive bidding while others allow negotiated contracts with pre-qualified ESCOs. Some state energy offices charge an administrative fee, generally around 1% of total project cost, to oversee or facilitate local government projects.