A solar power purchase agreement, usually shortened to PPA, is a contract where a solar company installs panels on your roof at no upfront cost, keeps ownership of the equipment, and sells you the electricity those panels produce at a per-kilowatt-hour rate locked in below what your utility charges today. The developer handles installation, repairs, and monitoring for the life of the agreement, which typically runs 10 to 25 years. In exchange for taking on the hardware cost, the developer collects your monthly electricity payments and claims the federal tax credits that make the project profitable.
How the Arrangement Works
You never own the panels. The developer carries the financial risk of the equipment, handles every repair, and claims the government incentives. Your only obligation is paying for each kilowatt-hour the system delivers to your home.
The financial engine behind every residential PPA is the federal clean electricity investment credit. For solar systems placed in service in 2025 through 2027, Section 48E of the tax code provides a credit equal to 30% of the system’s installed cost for projects with a maximum output under one megawatt, which covers virtually every residential installation.1Office of the Law Revision Counsel. 26 USC 48E Clean Electricity Investment Credit Because the developer owns the equipment, the developer claims the credit. You don’t take it on your personal return. That’s the core trade-off: the developer absorbs the upfront cost in return for the tax benefit and passes some of that savings through as a lower electricity rate. If you want the tax credit yourself, you have to buy the system outright or finance it with a solar loan.
The developer also keeps the Renewable Energy Certificates and Solar Renewable Energy Certificates the system generates. These represent the environmental value of the clean electricity and can be sold to utilities that need to meet renewable energy mandates. Your contract will state explicitly that you waive rights to these certificates in exchange for your discounted rate.
The Contract Terms That Will Drive Your Costs
A PPA is a long commitment, and a handful of provisions determine whether it stays a good deal in year 15.
Rate and Escalator
Some agreements lock in a flat price per kilowatt-hour for the full term. Others include an annual escalator that raises your rate by a set percentage each year. Fair escalators generally fall between 1% and 3%. Anything higher deserves scrutiny, because a seemingly small rate like 3.5% compounds significantly over 20 years and can push your PPA price above utility rates in the back half of the contract. If an escalator is on the table, run the math out to year 15 and compare it to your utility’s historical rate increases.
Production Guarantee
A production guarantee commits the developer to a minimum energy output, typically at least 80% to 90% of the projected annual generation. If the system falls short, the developer compensates you for the electricity you didn’t receive. This is one of the most important protections in the contract because it puts the risk of equipment failure, degradation, and poor maintenance on the party that owns the hardware.
Term Length
Most residential PPAs run 20 to 25 years, though some shorter agreements start at 10. The long timeframe exists because the developer needs to recoup installation costs and earn a return on the tax credits they claim. From your side, the length matters because the contract follows the property if you sell your home.
Where PPAs Are Even Available
Not every state allows third-party solar ownership. As of mid-2025, roughly half the states plus the District of Columbia clearly authorize residential PPAs. Several states allow PPAs only with restrictions, such as limiting system size to no more than a property’s average annual consumption. A handful of states, including Florida, Louisiana, and Mississippi, prohibit PPAs but do allow solar leases, which is a meaningful distinction if you live in one of those markets. Around 17 states have no residential third-party solar ownership framework at all, which effectively blocks both PPAs and leases.
Even inside states that authorize PPAs, municipal utilities and electric cooperatives sometimes operate outside the rules that apply to investor-owned utilities. If your power comes from a municipal utility, confirm that third-party agreements are permitted in your service territory before you spend time applying.
PPA vs. Solar Lease
The two get confused constantly. The ownership structure is identical — the developer owns the panels, claims the credits, handles maintenance, and the contract transfers to a buyer if you sell. The payment is what differs.
Under a PPA, you pay per kilowatt-hour of electricity the system actually produces. Your bill fluctuates with the seasons because panels generate more in summer than winter. Under a solar lease, you pay a fixed monthly amount regardless of production that month. The lease payment is based on estimated annual output, but you pay the same in December as you do in July.
A PPA more closely aligns the developer’s incentive with keeping the system running at peak output, since they only get paid for what the panels actually deliver. A lease gives you a predictable monthly number.
Qualifying and Getting It Installed
Developers screen for both financial stability and property suitability. On the financial side, most developers look for a credit score of at least 650, and you’ll need to provide proof of property ownership. Renters can’t sign these agreements.2U.S. Department of the Treasury. Guide Before You Sign a Power Purchase Agreement You’ll also submit at least 12 months of utility bills so the developer can map your seasonal usage and size the system.
The property evaluation focuses on your roof: its age, structural condition, your electrical panel’s capacity in amperes, and any shading from trees or neighboring buildings. Shading sinks the most proposals, because even partial shade on a few panels can reduce output projections enough to make the economics unworkable for the developer.
Once you’re approved and the developer’s engineers have visited, the project moves into design and permitting. Permitting timelines vary widely by jurisdiction and are the biggest variable in the overall schedule. The physical installation itself is fast — most residential systems go up in one to three days. After mounting and wiring, a local inspector verifies code compliance, and the utility grants permission to operate. From signed contract to flipping the switch, most residential projects take two to four months.
What Your Monthly Bill Looks Like
Your PPA bill is based entirely on how much electricity the system produces. A dedicated production meter tracks output, and you pay the agreed rate for every kilowatt-hour. In summer, when the panels are generating heavily, your PPA bill rises and your utility bill drops by a corresponding or larger amount. In winter, both shift the opposite way. The net effect in most markets is a lower total electricity cost across the year compared to buying everything from the utility.
When the system produces more power than your home uses at any moment, the excess typically flows to the grid. How you’re credited for that surplus depends on your state’s net metering rules and the specific terms of your PPA. In some arrangements, the net metering credits offset your utility bill; in others, the developer captures part of that value. This is worth clarifying before you sign.
You pay nothing extra for maintenance during the contract. Inverter replacements, panel cleaning, and performance monitoring are all the developer’s responsibility, and their profit depends on keeping the system in peak condition.
Selling Your Home During a PPA
This is where PPAs create friction most buyers don’t anticipate. The contract is tied to the property, so when you sell, the buyer has to assume the agreement or you have to buy out the remaining term yourself.
Transferring the Contract
Most solar companies have a transfer team. The buyer typically needs to meet the same credit qualifications you did. Some developers accept a mortgage approval as sufficient; others run their own check. The transfer adds a step to the home sale, and some buyers hesitate to take on a long-term energy contract they didn’t choose. Working with your solar provider early in the listing process helps avoid surprises at closing.
The Appraisal Problem
Under Fannie Mae’s guidelines, an appraiser cannot include the value of leased or PPA-covered solar panels in your home’s appraised value.3Fannie Mae. Appraising Properties with Solar Panels If you owned the system outright, the appraiser could factor the panels into home value. With a PPA, they can’t. The system sits on your roof producing electricity, but on paper it adds zero to what the house is worth.
Mortgage Implications for the Buyer
A buyer’s lender must review the PPA contract before approving the mortgage. Fannie Mae’s guidelines specify that PPA payments, where the amount is based solely on energy produced, may be excluded from the buyer’s debt-to-income ratio. That’s favorable compared to a solar lease, where the fixed monthly payment generally must be included in the DTI calculation unless the lease has both a fixed payment structure and a production guarantee with prorated compensation. The PPA contract must also state that the equipment owner is responsible for any installation or removal damage, and the lender must have the option to terminate the agreement in the event of foreclosure.4Fannie Mae. Special Property Eligibility Considerations
UCC Filings on Title
Many developers file a UCC-1 fixture filing to secure their ownership interest in the equipment attached to your property. The filing shows up on a title search and can raise questions during a sale or refinance. UCC filings last five years and must be renewed, so if a filing lapses or needs updating during a sale, the developer files a UCC-3 amendment to transfer, terminate, or update it. Your closing attorney or title company should flag any active UCC filings early in the transaction.
Roof Repairs While the Panels Are Up
If your roof needs replacement or repair while the panels are installed, you’re generally on the hook for the cost of removing and reinstalling the solar system unless your contract says otherwise. That cost can run several thousand dollars depending on system size and roof complexity. Before signing, ask the developer to provide a structural engineering assessment confirming the roof will last at least as long as the contract term. Some agreements require this upfront, including a signed engineer’s opinion that the roof will provide at least 25 years of service.5U.S. Securities and Exchange Commission. Solar Power Purchase and License Agreement Exhibit 6.4
The contract should also address who is liable for roof leaks or structural damage caused by the installation itself. In well-drafted agreements, the developer assumes responsibility for all roof work and provides third-party warranties from an approved roofing contractor.5U.S. Securities and Exchange Commission. Solar Power Purchase and License Agreement Exhibit 6.4 If your proposed contract is silent on installation damage or tries to shift that liability to you, that is worth negotiating.
If the Developer Goes Bankrupt
Solar companies do go under, and this is a fair worry on a 20-year commitment. When a developer with PPA customers files for bankruptcy, the customer agreements are typically acquired by another company as part of the proceedings. The acquiring company steps into the original developer’s shoes and assumes all maintenance obligations, production guarantees, and payment terms. Your monthly rate stays the same, and the system keeps generating electricity. The panels don’t stop working because the installer ran into financial trouble. If no acquirer immediately emerges, you’d continue using the electricity the system produces while the bankruptcy process sorts out who takes over the contract.
Property Taxes
Whether a PPA system affects your property taxes depends heavily on where you live. Because the developer owns the equipment, many jurisdictions classify the panels as business personal property belonging to the developer rather than a real property improvement to your home. In practice, local assessors often lack the data to determine whether leased or PPA-covered panels add value to the host property, and many have been unable to demonstrate any measurable increase. Many states also offer property tax exemptions for solar equipment, though the specifics vary. If property tax exposure concerns you, check whether your state exempts solar installations from assessment before signing.
End of Contract and Early Termination
When the contract expires, you generally have three options: renew the agreement, buy the system, or have it removed. Renewal terms are negotiated at that point and aren’t standardized across the industry. The buyout price is typically the greater of a scheduled amount written into the original contract or the system’s fair market value at purchase. The scheduled amount is derived from a discounted cash flow analysis that accounts for remaining PPA revenue, depreciation, and other financial factors from the developer’s side.
Most PPA buyout options don’t kick in until year six or later. Federal law includes a recapture provision requiring the developer to pay back a portion of the credit if the equipment ceases to qualify as investment credit property within five years of being placed in service. By year six there’s nothing left to claw back, which is why early buyouts are generally blocked. If you purchased the system earlier and the developer lost the credit, that cost would be baked into your buyout price.
If you don’t want to renew or buy, the developer is responsible for removing the equipment. The contract should spell out exactly who pays for removal and who repairs any roof penetrations. Not every contract handles this the same way, so resolve it before signing, not after 20 years have passed. In at least some commercial PPA agreements, the developer is explicitly liable for repairing any damage caused by system removal and must return the property to its prior condition.
Walking away from a PPA before it expires is expensive. Early termination fees are most commonly calculated as the net present value of your remaining payments, meaning the developer totals every payment left on the contract and discounts it to today’s dollars. For a system midway through a 20-year agreement, that figure can range from $10,000 to $40,000 or more depending on the system size, your rate, and any escalator. Some contracts use a declining fee schedule instead, and a few base the termination cost on fair market value minus depreciation. Either way, the number is large enough that most people transfer the contract during a home sale rather than terminate it.