A solar power purchase agreement, or solar PPA, lets you host solar panels on your property without buying them, and pay only for the electricity they produce at a per-kilowatt-hour rate locked in for 10 to 25 years. A third-party developer owns, installs, and maintains the equipment. You get power at a rate designed to undercut your utility, usually with no money down. Because you don’t own the hardware, the developer keeps the federal tax credits and depreciation benefits, and that is what makes the economics work on both sides.
How the Arrangement Works
Three parties sit around the table: you, the solar developer, and your existing utility. The developer designs, installs, owns, and maintains the panels on your roof or land for the life of the contract. You provide the physical space through a site license that lets the developer access the property for installation and upkeep. Your utility stays connected and supplies power whenever the panels aren’t producing enough to cover your needs.
This structure exists because the federal tax incentives for solar are worth far more to a company with taxable income than to a typical homeowner. The developer monetizes those incentives and passes some of the savings to you through a lower electricity rate. You skip the $20,000-plus cost of buying a system outright, and the developer earns revenue from your energy payments plus the tax benefits.
PPA vs. Solar Lease
These two get confused constantly. Under a PPA, your monthly cost moves with production: you pay per kilowatt-hour based on how much electricity the panels actually generate. Sunny month, you pay more. Cloudy month, less. Under a solar lease, you pay the same fixed amount every month regardless of how the system performs. Both involve third-party ownership, but the risk sits in different places. A PPA ties your cost to actual output. A lease shifts production risk to you, because the bill is the same even when the panels underperform.
Whether PPAs Are Allowed Where You Live
Not every state permits them. A handful of states restrict or effectively prohibit third-party electricity sales, which is the legal mechanism a PPA depends on. Before you gather documents or schedule a site assessment, confirm PPAs are allowed where you live. Your state’s public utility commission or energy office can answer this directly.
What You’ll Pay
Contracts run between 10 and 25 years, with 20 to 25 years being most common. Rates are quoted in cents per kilowatt-hour. Typical PPA rates run roughly $0.15 to $0.30 per kWh depending on your location, system size, and available incentives. Developers generally price the rate 10 to 30 percent below your current utility rate so you see savings from day one.
Most contracts include an annual price escalator that bumps your rate by a fixed percentage each year, usually 1 to 3 percent. The theory is that utility rates historically rise faster than 3 percent annually, so even with the escalator, you stay ahead. This is the single most important number in your contract. A 3 percent escalator on a 25-year deal means the rate roughly doubles by the final year. If utility rates don’t climb as projected, your savings shrink or flip to a loss in later years. Push for a lower escalator, or a fixed-price structure with no escalation at all if the developer offers one.
The developer should also provide a production guarantee specifying a minimum number of kilowatt-hours the system will generate annually. If output falls below that floor, most contracts require the developer to pay you for the shortfall. Read the guarantee closely. The threshold is sometimes set low enough that it rarely actually triggers.
What You Need to Qualify
Developers want to verify two things before approving an agreement: that you’ll pay reliably, and that your property can produce the power the economics assume. Expect to provide:
- Twelve months of utility bills, so the developer can size the system. Most contracts cap the array at 100 to 120 percent of your historical annual usage.
- A credit check. Most providers require a credit score in the mid-600s, and higher scores can unlock better per-kilowatt-hour rates.
- Roof details, including age, roofing material, and any known structural limitations. The engineering team assesses load-bearing capacity before approval.
- A shading analysis built from satellite imagery and your property’s GPS coordinates. Heavy shading from trees or neighboring buildings can disqualify a site.
- Your utility account number, which identifies your service address and lets the developer coordinate interconnection.
Getting any of this wrong causes real problems. Bad usage data produces a system that either barely dents your bills or overproduces in a way the developer can’t justify. A roof in poor condition may need replacement before installation can proceed, and some developers walk away rather than wait. Gather everything before you apply.
Why You Don’t Get the Tax Credits
Because the developer owns the equipment, they claim the federal clean electricity investment credit. For solar systems under 1 megawatt placed in service through 2027, the credit equals 30 percent of project cost, with potential bonuses for domestic components or siting in certain communities.1Office of the Law Revision Counsel. 26 USC 48E – Clean Electricity Investment Credit The developer also claims accelerated depreciation. Solar energy property qualifies as five-year property under the Modified Accelerated Cost Recovery System, so the full equipment cost is written off within roughly six tax years.2Internal Revenue Service. Cost Recovery for Qualified Clean Energy Facilities, Property and Technology
You get none of this directly. You don’t own the system, so you can’t claim any credits on your personal return. What you get instead is a lower electricity rate, partially subsidized by the developer’s ability to capture those incentives. That trade-off is the engine behind every PPA. If you have enough tax liability to actually use the credits yourself, buying a system outright or financing it with a solar loan may save you more over the same period.
Contract Terms Worth Negotiating
PPA contracts arrive looking standardized, and developers don’t always volunteer that terms are negotiable. A few provisions are worth pushing on:
- The escalator rate. One percentage point compounds dramatically over 20 years. A 1 percent escalator versus a 3 percent escalator on a $0.15/kWh starting rate means paying roughly $0.18 versus $0.27 per kWh in year 20. Ask for the lowest available, or a fixed rate.
- The production guarantee threshold. It should be tied to the system’s projected performance, not an artificially low floor the developer will never miss.
- The buyout and termination payment schedule. Get it in writing before signing. Some developers bury this in an exhibit rather than the main contract. Know what it costs to exit in years 6, 10, 15, and 20.
- Roof repair language. The contract should state explicitly that the developer repairs any damage from installation at their expense, and that the installation won’t void your existing roof warranty.
- End-of-term default behavior. Some contracts transfer ownership of the system to you automatically if you take no action. That sounds convenient until you realize you’ve inherited aging equipment and its maintenance costs.
The U.S. Treasury Department publishes a consumer guide specifically on signing power purchase agreements that covers additional warning signs worth reviewing before committing.3U.S. Department of the Treasury. Guide – Before You Sign a Power Purchase Agreement
One more detail worth confirming in writing: who pays any property tax assessed on the system. Because the developer owns the equipment, that liability generally sits with them, and about three dozen states offer some form of property tax exemption for solar. Whether those exemptions apply to third-party owned systems varies by state, so the contract should spell out who bears the tax. If it’s silent, ask before you sign.
What Happens If You Sell the House
This is where PPA hosts get surprised most often. The agreement is a long-term contract attached to your property, and it doesn’t vanish at closing. You have three realistic options: transfer the agreement to the buyer, buy out the system before you sell, or negotiate removal with the developer.
Transfer is the most common path. The buyer assumes the remaining term and all payment obligations. Most developers run dedicated transfer teams and require the new homeowner to meet credit requirements, though some accept mortgage approval as sufficient qualification. Disclose the PPA to buyers early. Burying it until inspection creates friction and kills deals. Include the transfer as a contingency in the purchase agreement so both sides know what’s being assumed.
Developers often file a UCC-1 fixture filing in local property records to protect their ownership interest in the panels. Because the panels are physically attached to your roof, they could legally be treated as part of the real estate without that filing. The filing shows up during the buyer’s title search and has to be addressed before closing. It doesn’t stop the sale, but it adds a step and can confuse buyers and lenders who haven’t seen solar transactions before.
Mortgage programs add another wrinkle. FHA guidelines address homes with existing leases or PPAs, but the requirements vary and can create hurdles for buyers using FHA financing.4U.S. Department of Housing and Urban Development. FHA Solar and Wind Technologies Program VA and conventional loans have their own rules. If your buyer’s lender flags the PPA, the closing timeline can stretch. Knowing your developer’s transfer process and having the paperwork ready before listing helps avoid last-minute scrambles.
What Happens If You Default
Falling behind on payments triggers a fast cascade. Industry-standard contracts define a payment default as failing to pay any amount owed within 10 days of receiving written notice. That’s not much runway. Once in default, the developer can suspend service, meaning the panels stop producing and you’re buying all your electricity from the utility at full price while still under contract.
If the default continues, the developer can terminate with five days’ written notice. Termination doesn’t release you from financial obligation. You’ll owe a termination payment calculated from a schedule built into the contract, plus any unpaid balance. These payments are designed to make the developer whole for the remaining economic value of the contract, so they can be substantial in the early years when the system is worth the most.
Removal after a default also isn’t automatic. A developer must remove their equipment when a contract ends normally, but after a payment default, they may refuse to remove the panels unless you prepay the estimated cost of restoring the roof. That leaves you with non-functioning panels you can’t legally remove yourself because you don’t own them.
Buying Out the System Early
Most contracts include a buyout clause letting you purchase the system at fair market value. The window typically opens after year six. That timing is not random. It lines up with the end of the developer’s five-year accelerated depreciation schedule and the federal tax credit recapture period.2Internal Revenue Service. Cost Recovery for Qualified Clean Energy Facilities, Property and Technology Before that point, selling would cost the developer tax benefits, so earlier buyouts either aren’t offered or carry a steep premium.
Fair market value gets set by an independent appraiser. Three methods come up. The income approach calculates the present value of the electricity the system is expected to produce over its remaining life. The market approach uses comparable sales. The cost approach uses depreciated replacement value, though appraisers rarely rely on it alone.
Before you pull the trigger, run two scenarios: paying PPA bills for the rest of the term versus buying the system and handling maintenance yourself. A system in year seven still has 15 to 18 years of useful life, but panels degrade roughly 0.5 percent per year, and you’ll take on inverter replacement costs the developer would otherwise cover. The math often favors buying out older systems where the fair market value has dropped sharply but the panels still have a decade of production left.
What Happens When the Contract Ends
At the end of the full term, you typically have four options:
- Free removal. The developer takes back the panels at no cost and restores the roof. Cleanest exit if you’re done with solar.
- Short-term renewal. You extend in increments of one to five years at a renegotiated rate. Useful when the panels are still performing well and you want to keep the savings without a long commitment.
- Full renewal with new panels. The developer installs a new system and you sign a fresh 20- to 25-year agreement. Modern panels will likely outproduce the originals, but you’re locking in for another generation.
- Buyout. You purchase the existing system at fair market value, which by this point is usually quite low. You become the owner and take over all maintenance.
Some contracts transfer ownership to you automatically at the end of the term if you don’t pick an option. Read the end-of-term section carefully so you aren’t caught off guard by inheriting equipment near the end of its useful life.