A solar power purchase agreement, or solar PPA, works like this: a developer installs solar panels on your property at no upfront cost, keeps ownership of the equipment, and sells you the electricity those panels produce at a fixed per-kilowatt-hour rate that’s usually lower than what your utility charges. You get cheaper power without buying hardware; the developer gets a long-term customer and the federal tax credits that come with owning a solar system. Contracts typically run 10 to 25 years.
How the Power Actually Flows
The developer installs panels (or occasionally a small wind turbine) directly at your property and wires the system into your building “behind the meter.” That means the electricity feeds into your property first, and you consume it on-site before drawing anything from the utility. Whatever the system generates offsets what you’d otherwise buy from your utility at retail rates.
When production exceeds what you’re using at that moment, the surplus flows out to the local grid. Many states run net metering or similar programs that credit exported energy back on the utility bill, but the credit formula and who receives the credit (you or the developer) depend on state rules and on the specific PPA. Your property stays connected to the grid the entire time, so at night or on cloudy days you pull utility power the normal way.
The Three Parties
Three players make a PPA work. The developer designs, finances, builds, owns, and maintains the system for the full contract term. You, the host (sometimes called the off-taker), provide the location, agree to buy the electricity, and keep the panel area accessible and clear. The local utility stays in the background, supplying power when the panels aren’t producing enough and managing the grid connection that keeps your building lit around the clock.
What You Pay
You don’t buy hardware. You buy electricity, priced per kilowatt-hour, at a rate typically below your utility’s retail price. Most contracts include an annual price escalator, commonly 1% to 3%, so the rate creeps up over the life of the deal. Starting at $0.12 per kWh with a 2% escalator, you’d pay roughly $0.122 in year two and $0.125 in year three.
You pay only for electricity the system actually delivers. If a component fails and production stops, you owe nothing for the missing kilowatt-hours. That’s a real difference from a lease, where the monthly bill arrives whether the panels work or not, and it gives the developer a direct financial reason to keep the equipment running.
Why the Developer Owns the System
The financial structure of a PPA is built around federal tax incentives. For solar projects placed in service after 2024, the owner of the system can claim the clean electricity investment tax credit under Section 48E of the Internal Revenue Code, worth up to 30% of the system’s cost when the project meets prevailing wage and apprenticeship requirements.1Office of the Law Revision Counsel. 26 U.S. Code 48E – Clean Electricity Investment Credit
Because the developer owns the system, the developer claims the credit. That’s the point. Nonprofits, municipalities, and many homeowners can’t fully use a 30% credit even if they own the panels, so the PPA moves the equipment into the hands of a party with enough taxable income to absorb the credit, and passes the savings back to you through a lower electricity rate.
For the IRS to treat the arrangement as a service contract rather than a disguised sale, an end-of-term buyout has to happen at fair market value, not a token price. A cheap pre-set buyout could retroactively unwind the developer’s tax credits, so PPAs are drafted carefully to avoid it.
Who Owns the Renewable Energy Certificates
Every megawatt-hour of clean electricity generated produces a renewable energy certificate (REC), a tradable commodity representing the environmental benefits of that generation. In most PPAs, the developer keeps the RECs and often sells them to generate additional revenue, which is part of what keeps your per-kWh price low.2Department of Energy. Power Purchase Agreement
The practical consequence: without the RECs, you can’t formally claim your property runs on renewable energy for programs like the EPA’s Green Power Partnership or corporate carbon reporting.3US EPA. Solar Power Purchase Agreements Some PPAs let you negotiate for REC ownership, but expect a higher electricity rate in exchange.
Performance Guarantees
Beyond pay-for-what-you-get pricing, many PPAs include a performance guarantee: a minimum number of kilowatt-hours the system should produce each contract year. If output falls short, the developer owes you a payment calculated on the shortfall.
Guarantees typically carve out losses from severe weather, grid outages, utility-ordered curtailments, and theft, and they won’t apply if you fail your own obligations, like letting a tree grow into the panels’ sun. The guaranteed production level, the shortfall rate, and the list of exclusions vary widely, so read those terms before signing.
What You’re Responsible For
You provide the site, keep the panel area free of shading and obstructions, and let the developer in for maintenance. You don’t own the equipment, so it doesn’t sit on your balance sheet and you don’t handle depreciation, repairs, or component replacement. The developer carries insurance on the hardware.
Most developers give you a monitoring platform that tracks production, savings, and system alerts in real time.4Department of Energy. Monitoring Platforms for Solar Photovoltaic Systems
Roof Repairs During the Contract
If your roof needs work while the panels are up, the system has to come down temporarily. The developer’s company usually has to approve the work, but the host typically pays for removal and reinstallation. For a standard residential system, that runs roughly $2,000 to $8,500 depending on size and roof complexity. Since roofs last 20 to 30 years and PPAs can run just as long, at least one round of roof work during the contract is a realistic possibility, especially if the roof is already aging when the panels go up. Ask the developer up front what the process costs and whether the contract shifts any of that expense to them.
End of the Contract
As the term winds down, you generally have three choices:
- Renew. You and the developer negotiate a new term, often at a revised rate, and the equipment stays put.
- Buy the system at fair market value. The price has to reflect actual remaining value, not a token dollar, to protect the developer’s tax credits. Panels degrade slowly and can keep producing for 30 years or more, so the buyout won’t be negligible after 20 years of use.
- Have the system removed at the developer’s expense.
The fair market value rule means you can’t lock in a cheap purchase price at signing. Check the contract’s formula for determining that value.
Getting Out Early or Selling the Property
Ending a PPA before the term is up is expensive. Early termination fees usually reflect the developer’s lost revenue across the remaining years and can run into the tens of thousands of dollars. Some contracts calculate the fee as the present value of all remaining payments; others base it on removal costs plus any tax credits the developer would owe back to the IRS. Some contracts reduce or waive the fee for events like property condemnation or natural disaster. Read the exact formula before you sign.
Selling the property usually means transferring the PPA to the buyer. Developers typically have a department that handles the paperwork, credit-checks the buyer, and coordinates with the title company, and a buyer who qualifies for a mortgage usually qualifies to take over the PPA. If the buyer fails the credit check or refuses to assume the agreement, you may have to buy out the PPA yourself to close the sale.
Financing can get tangled too. Developers commonly file a UCC lien on the equipment, and in some jurisdictions that filing can be read as touching the whole property rather than just the panels, in which case the lien has to be released or subordinated before you can refinance or sell.5Consumer Financial Protection Bureau. Issue Spotlight: Solar Financing
PPA vs. Solar Lease
PPAs and solar leases both put panels on your property without you buying them, but the money moves differently:
- A PPA charges per kilowatt-hour of electricity produced. A lease charges a fixed monthly amount regardless of production.
- PPA payments rise in summer and fall in winter along with sunlight. Lease payments stay flat.
- If the system breaks, a PPA bill drops to zero. A lease bill doesn’t change.
- Leases are easier to budget. PPAs require more planning around seasonal swings.
Both keep the developer as the system owner, and both offer comparable contract lengths and end-of-term options. The choice usually comes down to whether you want a predictable monthly bill or pay-for-what-you-get pricing.
Whether a PPA Is Even an Option Where You Live
Third-party PPAs are not legal in every state. Some states authorize them clearly, some prohibit them, some allow solar leases but not PPAs, and some have never definitively tested the question. Where they are allowed, restrictions can include caps on system size, limits to commercial customers only, or requirements tied to specific utilities. Confirm your state’s rules with the public utility commission or state energy office before you spend time shopping developers. If a PPA isn’t available for your property, a solar lease or a solar loan to purchase your own system may be the closest alternatives.