Rooftop solar can cut your electricity bill dramatically, but the upfront cost of buying panels stops many homeowners. Two popular alternatives let you go solar with little or nothing down: the solar lease and the solar power purchase agreement, or PPA. They sound similar, and salespeople sometimes use the terms interchangeably, but they work differently and the savings differ too.
This guide explains how each option works, where they diverge, and how to figure out which one saves you more money over the life of the system.
What Is a Solar Lease?
With a solar lease, you rent the solar panel system installed on your roof. A solar company owns, installs, and maintains the equipment, and you pay a fixed monthly lease payment for the right to use it. The electricity the panels generate flows into your home, reducing what you draw from the grid.
The key feature of a lease is payment certainty. Your monthly payment is fixed, often with a small annual escalator of 1 to 3 percent. You know exactly what you will pay each month for the 20 to 25 year term, regardless of how much electricity the panels produce. If the system underperforms, that is the leasing company’s problem, not yours.
Because you do not own the system, you cannot claim the federal solar investment tax credit or other ownership incentives. Those go to the leasing company, which theoretically factors them into your pricing. You also cannot sell the panels with your home as an asset, though the lease itself can usually be transferred to a buyer.
What Is a Solar PPA?
With a solar power purchase agreement, you agree to buy the electricity the panels generate at a set price per kilowatt-hour. The solar company still owns and maintains the system, but instead of a fixed monthly rent, you pay only for the power produced, much like buying electricity from a utility.
The per-kWh rate is typically lower than your local utility rate, which is where the savings come from. Like leases, PPAs usually include an annual escalator, commonly 1 to 3 percent, applied to the electricity rate. Terms run 20 to 25 years, similar to leases.
The practical difference is variability. Your PPA bill moves with production: sunny months cost more because the system generates more power, cloudy months cost less. Your total cost tracks actual output, while a lease charges the same amount whether the panels have a great month or a mediocre one.
Solar Lease vs PPA: Key Differences
How You Pay
This is the fundamental distinction. A lease charges a flat monthly fee for the equipment. A PPA charges per unit of electricity generated. If predictable bills matter most to you, the lease wins. If you prefer paying strictly for what the system delivers, the PPA has the edge.
Performance Risk
Under a PPA, the solar company has a direct incentive to keep the system performing well, because its revenue depends on production. Under a lease, the company gets paid the same regardless, though reputable firms still maintain their systems to protect their reputation and meet production guarantees. Many leases include a minimum production guarantee that triggers compensation if output falls short.
End-of-Term Options
Both structures offer similar choices when the term ends: renew the agreement, have the system removed at no cost, or sometimes purchase it at fair market value. Neither option builds equity during the term, which is the main financial difference between leasing and rent-to-own style arrangements where payments build toward ownership.
Which Saves You More?
The honest answer is that it depends on the specific quotes, your utility rates, and your roof’s solar potential. But some general patterns hold.
PPAs often produce slightly larger lifetime savings for homes with excellent sun exposure. Because you pay per kWh, a highly productive system delivers more cheap electricity relative to what you pay. On a shaded or partially obstructed roof, a lease’s fixed payment can be the better deal, since you pay the same low rate even when production is modest.
The escalator clause deserves close attention in both cases. A 2.9 percent annual escalator compounds significantly over 25 years. Compare it against your utility’s historical rate increases in your area. If utility rates have risen 3 to 4 percent annually, even an escalated solar rate stays competitive. But a high escalator can erase the savings in later years, so model the full term, not just year one.
To compare properly, ask each company for a 25-year savings projection based on your actual usage history, then discount the future savings to present value. A quote that saves $100 per month in year one but escalates aggressively may underperform a quote with smaller initial savings and a lower escalator.
Solar Lease vs PPA vs Buying Outright
Buying the system outright almost always delivers the largest lifetime savings, often 40 to 60 percent more than leasing. You capture the federal tax credit, currently 30 percent through 2032 for residential installations, plus any state incentives. You also own an asset that can increase your home’s value.
The tradeoff is the upfront cost, typically $15,000 to $25,000 after incentives for an average home. Financing through a solar loan splits the difference: you own the system and the incentives, but pay over time. The lease versus finance decision in solar rhymes with the broader lease versus finance tradeoff seen in other markets. Ownership usually wins on total cost, while leasing wins on simplicity and upfront cash.
If you cannot use the tax credit, because your tax liability is too low, for example, leasing becomes relatively more attractive. The leasing company can use the credit and passes part of the value to you through lower payments, which is value you could not capture on your own.
Which Option Fits Your Situation?
Choose a solar lease if you value predictable monthly costs above all else, if your roof has moderate rather than excellent sun exposure, or if you simply want the simplest possible arrangement. The fixed payment makes budgeting easy and removes any production anxiety.
Choose a PPA if your roof gets strong, unshaded sun, if you like the idea of paying only for power actually generated, and if the quoted per-kWh rate with its escalator beats your utility’s trajectory. Homes in the sunniest states with high utility rates tend to benefit most from PPAs.
Consider buying, with cash or a loan, if you have the tax liability to use the federal credit and can handle the upfront cost or loan payments. And if you are selling your home within a few years, think carefully: buyers must agree to assume a lease or PPA, which can complicate a sale, while owned panels are generally a selling point.
Questions to Ask Before Signing
Whichever structure you lean toward, get answers in writing before you commit. What is the exact escalator, and how does it compound over the full term? What production guarantee comes with the system, and what compensation do you receive if it underperforms? Who handles maintenance, repairs, and monitoring, and how quickly do they respond to outages?
Ask about transfer terms if you sell your home, including any credit requirements for the buyer and transfer fees. Clarify what happens at the end of the term, including removal costs and purchase options. Finally, watch for red flags in the contract, such as vague performance language, automatic renewal clauses, or penalties for early termination. A solar agreement lasts decades, so an hour of careful review now can save you thousands later. Get competing quotes for both leases and PPAs on your specific home, and let the numbers for your roof decide.