An energy service agreement, or ESA, is a pay-for-performance contract under which an energy service provider finances, installs, owns, and maintains upgrades to your building’s lighting, HVAC, controls, and other energy-consuming systems, and you pay a service charge tied to the actual energy savings those upgrades deliver. There’s no upfront capital from you. Contract terms usually run 5 to 15 years, the provider carries the performance risk during that period, and if the savings fall short of what was promised, your payments drop with them. The structure fits organizations that need infrastructure improvements but can’t justify the capital expense or don’t want the project sitting on their balance sheet.
How the Arrangement Works
The provider starts with an energy audit of your building, identifies which upgrades will produce measurable savings, and then pays for everything: design, engineering, equipment, and installation. Once the new systems are running, the provider monitors your energy consumption and compares it against a pre-agreed baseline representing what you would have spent without the upgrades. You pay a service charge based on the savings that actually show up on your utility bills. Short savings mean smaller payments.
That structure shifts the performance risk almost entirely to the provider. A provider that installs underperforming equipment or designs a poor control strategy absorbs the financial hit, not you. It’s what separates an ESA from a simple equipment lease or a traditional loan for energy improvements. The provider’s revenue depends on the project working as promised, which creates a continuing incentive to maintain and optimize the systems throughout the contract.
ESA Versus an Energy Savings Performance Contract
People often confuse energy service agreements with energy savings performance contracts (ESPCs). The two share DNA but differ in an important way. In a performance contract, the building owner typically borrows money to fund the improvements and repays that debt from the energy savings; the financing obligation sits with the owner and usually shows up as debt on the balance sheet. In an ESA, the provider finances the project and retains equipment ownership, so your obligation looks more like paying a utility bill than servicing a loan.
The federal government uses both models. Under the Department of Energy’s ESPC program, federal agencies can structure projects as energy sales agreements where the energy service company privately owns the equipment for tax purposes while the agency purchases the energy output at guaranteed savings below its current utility costs. The federal ESPC authority allows contract terms up to 25 years, though IRS Revenue Procedure 2017-19 limits the ESA structure to 20 years to maintain its tax treatment as a service contract rather than a sale.1U.S. Department of Energy. Energy Savings Performance Contract Energy Sales Agreements
What the Contract Locks In
Most commercial ESAs run between 5 and 15 years, though the exact duration depends on the size of the investment and how long it takes for the energy savings to repay the provider’s capital.2U.S. Environmental Protection Agency. Performance Contracting and Energy Service Agreements Larger projects with deep retrofits tend toward the longer end. The contract spells out every piece of equipment being installed, its expected useful life, and which party is responsible for replacing components that fail during the agreement.
Equipment Ownership and Maintenance
The provider owns the equipment throughout the contract term.2U.S. Environmental Protection Agency. Performance Contracting and Energy Service Agreements Ownership determines who carries insurance, who handles repairs, and who can claim depreciation or tax benefits. Providers typically maintain liability and property insurance on all installed assets and handle routine and emergency maintenance as part of the service charge.
Your side of the deal involves keeping the facility within agreed-upon operating parameters. If you dramatically change occupancy schedules, alter thermostat setpoints, or renovate part of the building without notifying the provider, you risk triggering a baseline adjustment clause. These clauses let the provider recalculate the savings target based on the new conditions, which changes your payment amount. Most contracts require you to report any significant change in building use within a set number of days so the provider can update its models.
The Performance Guarantee
The heart of an ESA is its performance guarantee. The provider commits to a specific level of energy savings and backs that commitment with financial consequences. If the installed measures don’t hit the guaranteed savings number, your service charge decreases. Some contracts go further and require the provider to pay liquidated damages or make up the shortfall directly. The guarantee only holds, though, if you’ve maintained the facility as the contract requires. That trade-off is where disputes most commonly arise.
Indemnity and Liability
ESA contracts include indemnity provisions that allocate risk for property damage and injuries during and after installation. The scope varies significantly. A narrow-form indemnity clause limits the provider’s obligation to losses it actually caused or contributed to. An intermediate-form clause broadens that exposure so the provider covers all losses unless the building owner was solely negligent. A broad-form clause pushes all risk to the provider regardless of fault. Which version you negotiate matters if something goes wrong during construction or if equipment causes damage years later.
How Your Payments Are Calculated
Your service charge depends on a baseline representing what you would have spent on energy if the upgrades had never happened. Establishing that baseline requires 12 to 24 months of utility bills for electricity, natural gas, and water. The baseline is then adjusted over time for variables like weather, occupancy changes, and rate adjustments so the savings calculation stays fair to both sides.
Once the baseline is set, the provider compares your actual post-retrofit energy use against it. The difference is the savings, and your payment is a negotiated percentage of that amount. A building owner might agree to pay the provider a portion of the savings while keeping the rest as immediate budget relief. The exact split depends on project economics, the provider’s required return, and your bargaining position. Payments are contingent on performance: smaller savings mean smaller bills.
Most ESAs rely on the International Performance Measurement and Verification Protocol (IPMVP) to calculate savings with enough rigor that both parties trust the numbers.3Efficiency Valuation Organization. International Performance Measurement and Verification Protocol Concepts and Options for Determining Energy and Water Savings IPMVP offers four options, ranging from measuring a single key parameter for a simple lighting retrofit to running a calibrated computer model of the building for complex projects.4U.S. Department of Energy. Measurement and Verification Options for Federal Energy and Water Saving Projects Your contract should specify which option applies to each measure, because the choice of verification method directly affects how disputes about savings will be resolved.
Balance Sheet and Accounting Treatment
One of the biggest selling points of an ESA is the potential to keep the obligation off your balance sheet. Because the provider owns the equipment and you’re paying for a service rather than repaying a loan, the transaction can be classified as an operating expense rather than debt. That distinction matters for organizations with debt covenants, credit ratings to protect, or boards that resist adding liabilities.
The reality is more nuanced than the sales pitch. Under current accounting standards, whether an ESA stays off balance sheet depends on whether the arrangement conveys control of an identified asset to you. If it does, the agreement may need to be treated as a lease, meaning you recognize both an asset and a liability on your books. If the provider retains meaningful control over how the equipment operates and you’re simply buying the energy output as a service, it’s more likely to qualify as a service contract with off-balance-sheet treatment.
The IRS has addressed this for federal projects through Revenue Procedure 2017-19, which provides a safe harbor under which the IRS will not challenge the treatment of an ESPC ESA as a service contract rather than a sale, provided the contract meets specific requirements including a maximum term of 20 years.1U.S. Department of Energy. Energy Savings Performance Contract Energy Sales Agreements Private-sector ESAs don’t have an equivalent safe harbor, so the accounting classification depends on how the contract is structured. Have your accountant review the agreement before execution, not after.
How a Project Unfolds
The process starts with gathering 12 to 24 months of utility records for electricity, natural gas, and water, along with building-specific information like square footage, occupancy schedules, equipment inventory, planned renovations, and maintenance history. Most ESA providers will then conduct what the industry calls an investment-grade audit (roughly a Level 2 audit under ASHRAE Standard 211) to confirm which measures are technically and financially viable.5ASHRAE. ANSI/ASHRAE/ACCA Standard 211-2018 – Standard for Commercial Building Energy Audits The audit takes several weeks to a few months depending on building complexity, and its results feed directly into the final contract, which locks in scope of work, guaranteed savings, payment structure, and verification methods. Don’t rush this stage. The audit is where the provider’s promises get converted into binding numbers.
Construction typically takes three months to a year, with the provider managing all subcontractors and pulling the necessary permits. Most contracts require the work to be staged so your building stays operational throughout. Expect some disruption during equipment changeovers, but a competent provider will schedule the most invasive work during off-hours or low-occupancy periods.
Once construction wraps up, the project enters its measurement and verification phase, which continues for the life of the agreement. The provider monitors system performance, generates monthly or quarterly reports comparing actual consumption to the baseline, and calculates your service charge accordingly. Those reports are your primary tool for confirming you’re getting what was promised. Read them. If the numbers don’t track with what you see on your utility bills, raise it immediately rather than waiting for an annual reconciliation.
Getting Out: End of Term, Early Exit, and Provider Default
When the Contract Expires
When the agreement reaches its natural end, you typically have a few options: purchase the equipment at fair market value, take ownership at no cost, or have the provider remove everything and restore the space. Which options are available depends on what you negotiated at the outset. For federal projects, the government must retain title to on-site equipment by the end of the contract term.1U.S. Department of Energy. Energy Savings Performance Contract Energy Sales Agreements Private-sector contracts don’t have that requirement, so buyout terms vary widely.
If the contract calls for a fair market value purchase, the appraisal process matters. Fair market value is generally defined as the price a willing buyer and seller would agree to, neither under pressure to close. For aging energy equipment, that figure is often well below the original installation cost. Make sure your contract specifies who conducts the appraisal and how valuation disputes are resolved. An independent appraiser chosen by mutual agreement is better than one the provider selects unilaterally.
Leaving Early
Terminating an ESA before it expires almost always involves a substantial buyout. The provider sank capital into your building and structured its return over the full contract period, so an early exit means compensating for the investment that hasn’t been recouped. Early termination fees are typically calculated based on the remaining unamortized investment and often decline over time as the provider recovers more of its costs. Some contracts use a fixed declining schedule; others calculate the buyout based on the present value of remaining payments.
Building sales get complicated. If you sell the property during the ESA term, the new owner generally needs to assume the agreement or you need to negotiate a buyout. Most ESAs include assignment provisions that let you transfer the contract to a qualified buyer, but the provider usually has approval rights over the new party. Review the assignment language early if you’re thinking about a sale. Discovering a restrictive transfer clause during due diligence can delay or kill a deal.
If the Provider Goes Under
Because the provider owns the installed equipment, provider bankruptcy is a legitimate concern. The equipment bolted to your roof or wired into your electrical system is technically the provider’s asset, which means a bankruptcy trustee could argue it belongs to the provider’s creditors. In practice, the provider’s ability to reclaim equipment depends heavily on whether it filed a UCC fixture filing to protect its ownership interest in the installed systems. These filings are standard practice in well-structured ESAs and put future creditors on notice that the equipment is not part of the building’s real property.
If the provider goes under and hasn’t maintained proper filings, the situation gets murky. Bankruptcy courts generally treat the provider’s rights under the ESA as an executory contract that the trustee can either assume or reject. If the contract is rejected, you may lose the maintenance and performance guarantee but could end up with the equipment by default. If it’s assumed, a successor company takes over the provider’s obligations. Either way, your contract should include provisions addressing provider insolvency, including step-in rights that let you or a replacement provider continue operating the equipment.
Renewable Energy Certificates and Demand Response
When an ESA includes renewable energy systems like rooftop solar, the contract needs to address who owns the renewable energy certificates (RECs) those systems generate. RECs represent the environmental benefit of producing clean energy and have real market value. In the federal ESPC ESA model, the energy service company can sell the RECs generated by the project to reduce the price the federal agency pays.1U.S. Department of Energy. Energy Savings Performance Contract Energy Sales Agreements That trade-off makes the energy cheaper but means the agency can’t claim it’s using renewable energy for sustainability reporting.
For private-sector building owners, REC ownership is negotiable. If your organization has carbon reduction commitments or reports emissions under a voluntary framework, keeping the RECs may be worth more than the small discount you’d get by letting the provider sell them. Demand response participation is another revenue stream worth addressing. If the provider’s equipment can reduce your building’s load during peak grid events, which party gets to enroll in demand response programs and collect the payments should be settled upfront.
Tax Considerations That Affect the Price
The Section 179D energy-efficient commercial buildings tax deduction has been a significant incentive for building owners pursuing efficiency upgrades. Government and tax-exempt building owners who couldn’t use the deduction themselves have been able to allocate it to the energy service provider, effectively reducing project cost. The One Big Beautiful Bill Act added a termination provision: Section 179D will not apply to property whose construction begins after June 30, 2026.6U.S. Department of Energy. 179D Energy Efficient Commercial Buildings Tax Deduction
If you’re negotiating an ESA in 2026, the timing of construction start matters. Projects that begin construction before the June 30 deadline can still claim the deduction. Projects that start after that date cannot, which may change the provider’s pricing and the overall project economics. Ask your provider directly how the 179D sunset affects the deal structure and whether the quoted service charge assumes the deduction is available.
Beyond 179D, ESA providers structured as equipment owners may claim depreciation and other federal tax credits that aren’t available to tax-exempt building owners. That tax benefit flows indirectly to you through a lower service charge. Understanding which incentives the provider is capturing helps you evaluate whether the proposed pricing is competitive or whether the provider is keeping more of the tax benefit than the market justifies.