What Is a Solar Power Purchase Agreement? A Homeowner's Guide
Going solar sounds great until you look at the upfront cost. A full rooftop system can run $15,000 to $30,000 before incentives, and not every household has that budget. That's where a power purchase agreement comes in: a third-party company installs and owns solar panels on your property, and you buy the electricity those panels produce at an agreed per-kWh rate, which may be lower than your utility's rate. This guide covers how power purchase agreements work, what PPA marketing leaves out, and how a PPA compares to buying or leasing solar.
What Is a Power Purchase Agreement (PPA)?
If you've looked into going solar but balked at the price tag, you've probably come across the term power purchase agreement. So what is a power purchase agreement? With a solar power purchase agreement, a solar company puts panels on your roof, owns them, and maintains them. You don't pay anything upfront. Instead, you pay for the power those panels produce at a per-kilowatt-hour rate that’s usually lower than your utility’s.
You get a smaller electric bill from day one, and the solar company takes care of permits, monitoring, and repairs for the life of the contract.
There's an important trade-off, though. Because you don't own the system, because the developer owns the solar system, the customer generally cannot claim the federal Residential Clean Energy Credit for the system. Ownership never transfers during the contract, so you won't build equity in the equipment. If you're comparing a PPA against other options, our guide to solar financing breaks down each path side by side.
There's one thing most PPA marketing doesn't lead with: what happens to that power when the grid goes down.
Why a Solar PPA Still Needs Battery Backup
Have you ever assumed that solar panels on your roof mean you'll still have power during a blackout? Most people do. And most people are wrong.
Standard grid-tied solar, whether you own it, lease it, or finance it through a PPA, is required by safety standards to shut off during a power outage. This anti-islanding protection prevents your panels from backfeeding a de-energized grid and endangering utility workers.
If your PPA solar system goes dark in an outage, a home battery keeps the power on. EcoFlow TITAN is a self-contained battery and inverter system with whole-home 240V output, so it can run larger appliances when the grid goes down. Its capacity expands from 5kWh to 30kWh, and it carries UL9540, UL9540A and UL1741 safety certifications.
EcoFlow DELTA Pro is the simpler route. Unlike TITAN, it's a portable, plug-and-play power station with no panel modification or permits required, and it works as standalone backup without involving your solar provider.
If you'd rather not touch your electrical panel or involve your PPA provider, the DELTA Pro is a standalone backup you can set up yourself. For more on pairing batteries with existing solar panels, see our guide on battery storage for solar panels.
With the outage gap covered, it's worth understanding how a PPA works day-to-day.
How Does a Power Purchase Agreement Actually Work?
Signing a power purchase agreement solar contract means committing to a long-term relationship with a solar developer.
Contract length. PPA terms are often long-term, commonly around 20 years, although contract lengths vary. PPAs run 10 to 25 years, tied to the system's expected lifespan.
Rate structure. You'll pay a fixed per-kWh rate for solar electricity produced. Some contracts include a small annual escalator, commonly 1% to 3%, so your rate at year 20 could be higher than at year one. Run the numbers over the full term before signing.
Monthly billing. You'll still receive your utility bill for grid power, plus a separate PPA bill for panel-generated electricity.
End of contract. Options typically include renewal, system removal, or purchasing the panels at fair market value. The U.S. Department of Energy's homeowner's guide to solar covers these options in detail.
How your PPA electricity interacts with the grid depends on your state's net metering rules. Check our net metering and grid-tied solar guide for a state-by-state overview.
Understanding the mechanics makes it easier to see how a PPA stacks up against the alternatives.
Power Purchase Agreement vs. Buying vs. Leasing Solar Panels
Choosing between a power purchase agreement, a cash purchase, and a solar lease comes down to what you value most.
PPA | Cash Purchase | Solar Lease | |
Upfront Cost | $0 | $15,000–$30,000+ | $0 |
System Ownership | Third-party developer | You | Third-party developer |
Federal Tax Credit (ITC) | Goes to developer | Goes to you (30% through 2032) | Goes to developer |
Monthly Payment | Per-kWh rate for power produced | None (you own the power) | Fixed monthly payment |
Long-Term Cost (20 yrs) | Moderate -depends on escalator | Lowest - free power after payback | Moderate - fixed regardless of output |
Maintenance | Developer's responsibility | Your responsibility | Developer's responsibility |
A cash purchase costs the most upfront but delivers the greatest long-term savings. You claim the federal tax credit, and once the system has paid for itself, the cost of generating electricity can be substantially lower than continuing to purchase all of your electricity from the grid. A lease and PPA both eliminate upfront cost, but a lease charges a fixed monthly amount regardless of production, while a PPA charges only for electricity generated. Our lease vs. buy solar panels guide breaks down the numbers.
Is a Solar Power Purchase Agreement Worth It?
Whether a solar power purchase agreement makes sense depends on your finances, your timeline, and what you want from solar power.
A PPA fits well if you want lower electricity costs with zero upfront spending and no maintenance. If a long-term contract doesn't bother you, a PPA delivers savings from day one.
It's a weaker fit if you're planning to sell soon. A home sale may require the PPA to be transferred, bought out, or otherwise resolved according to the contract terms and the buyer's eligibility, which can complicate the sale. It's also less attractive if you want the tax credit and long-term equity of ownership. The EPA's overview of customer power purchase agreements covers how PPAs are regulated across states.
Either way, outage backup isn't included in a PPA and needs separate planning.
Conclusion
A power purchase agreement lets you buy solar-generated electricity at a set rate without owning the panels. There's no upfront cost and no maintenance, and the rate is typically lower than your utility's. But a PPA doesn't include battery backup, and when the grid goes down, PPA-financed panels shut off just like any other grid-tied system. If you have or are considering a PPA, plan for backup separately. EcoFlow TITAN supports AC coupling with third-party PV systems, including PPA installations, for whole-home backup. The EcoFlow DELTA Pro provides standalone portable backup you can set up yourself.
FAQs
Do I own solar panels under a power purchase agreement?
No. With a power purchase agreement, the solar developer owns the panels, the inverter, and all the equipment for the full contract, usually 10 to 25 years. You're paying for electricity, not hardware. At the end of the contract, you may get the option to buy the system at fair market value, but ownership doesn't transfer on its own at any point. The developer handles all maintenance and repairs the entire time.
Can I get the federal solar tax credit with a PPA?
No. The federal Investment Tax Credit goes to whoever owns the system, and that's the solar developer. That said, the developer often factors that credit into the rate they offer you, so it can still bring your per-kWh price down.
What happens to my PPA if I sell my house?
You'll need to either transfer the PPA to the buyer (they'll have to agree to the terms and pass a credit check) or buy out what's left on the contract. Some buyers see a PPA as a perk; others see it as a hassle. Read the transfer clause in your contract before you list.
Does a PPA include battery backup for power outages?
No. A PPA covers the panels and the electricity they produce, nothing else. During a grid outage, PPA panels shut off automatically for safety (anti-islanding protection). If you want backup power during blackouts, you'll need a battery system separately. EcoFlow TITAN handles whole-home coverage, and EcoFlow DELTA Pro gives you portable standalone backup.
Is a power purchase agreement cheaper than buying solar panels outright?
In the short run, yes. You pay nothing up front. Over a full 20- to 25-year contract, buying almost always costs less in total because you own the system, claim the tax credit, and eventually get free electricity. A PPA trades those long-term savings for zero upfront cost and zero maintenance headaches.
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