A solar lease and a PPA both let you "rent" a rooftop system, and which costs less over 25 years depends mostly on the escalator and on how much the system actually produces. A lease charges a fixed monthly payment; a PPA charges a rate per kWh produced. In the worked example below, with the same $1,400 first-year cost, the PPA came out about $2,000 cheaper over 25 years than the lease at a 0% escalator, and the gap widened as escalators rose. Real contracts vary, so treat this solar lease vs PPA comparison as a method, not a price.
By the Solar Bid Analyzer research team · Updated November 2026
How a lease and a PPA are billed
Both are third-party ownership: the company owns, insures and maintains the system, and you pay for its use. EnergySage describes the difference simply. A lease is a fixed monthly amount, such as $230 per month in its example. A PPA is a per-kWh rate, such as $0.24 per kWh, so payments move with production. Residential leases and PPAs usually run 20 to 25 years, and many raise payments 1% to 3% per year.
That billing difference moves risk. Under a lease, you owe the fixed payment even if output is low. Under a PPA, you pay only for the electricity produced, according to a New York guide from the Clean Energy States Alliance and NYSERDA. In return, a PPA payment gets bigger when the system produces more.
Worked 25-year example
This is a hypothetical, not a quote. Assume a system that produces 10,000 kWh in year one and loses 0.5% of output each year (the degradation rate NREL's leasing guide uses). The PPA starts at $0.14 per kWh, which is $1,400 in year one. The lease is set to the same $1,400 in year one (about $117 per month). Both use the same annual escalator, and the lease payment does not fall as the panels age.
| Annual escalator | Lease, 25-year total | PPA, expected output | PPA, output 10% lower | PPA, output 10% higher |
|---|---|---|---|---|
| 0% | $35,000 | $32,980 | $29,680 | $36,280 |
| 1% | $39,540 | $37,160 | $33,440 | $40,880 |
| 2% | $44,840 | $42,040 | $37,830 | $46,240 |
| 3% | $51,040 | $47,730 | $42,960 | $52,500 |
Three lessons from the numbers:
- The escalator matters more than the label. Going from 0% to 3% adds about $16,000 to the lease and about $14,700 to the PPA.
- Production flips the winner. If the system produces 10% more than expected, the PPA costs more than the lease at every escalator shown. If it produces 10% less, the PPA is much cheaper.
- Degradation helps the PPA buyer. The PPA total falls as output declines, while a flat lease payment does not.
Of course, more production is also more bill savings from the utility, so a higher PPA bill is not necessarily a worse deal. Compare each contract to what you would pay the utility for the same kWh. See our solar financing guide for the purchase option.
Risks each shifts to you
| Risk | Lease | PPA |
|---|---|---|
| Low production | You still owe the fixed payment unless a guarantee pays you back | You pay for only what is produced |
| High production | Payment does not rise | Bill rises with output |
| Escalator | Applies to the payment | Applies to the rate per kWh |
| Predictability | Easier to budget | Varies month to month |
| Shading or roof work | Payment continues during downtime unless the contract says otherwise | You pay nothing for kWh not produced |
Clauses that matter more than the type
- Production guarantee. Check whether shortfalls are paid at wholesale or retail rates.
- Transfer and buyout. You can usually transfer to a buyer who passes a credit check, or buy out. EnergySage says buyouts can be priced at fair market value or a contract price, whichever is higher.
- End of term. Buy, renew or remove.
- Tax credit. The provider, not you, claims the federal business credit after the homeowner 25D credit ended for expenditures after 2025. Ask how value is passed to you through lower rates.
- Roof work. Who pays to remove and reinstall panels?
Our solar loan vs lease vs PPA guide gives the full financing comparison, and solar proposal red flags lists contract terms to question.
How to pick between them
If you want predictable bills and trust the production estimate, a lease is simple. If you worry about shading, roof changes or an optimistic production number, a PPA keeps you from paying for output that never shows up. In either case, ask for the year-by-year payment table, the guarantee and the buyout formula, and compare against a cash or loan purchase. Prepaid options exist too: EnergySage's first-half 2026 data reports prepaid leases and PPAs averaged lower cost per kWh than cash purchases. Check that your numbers match.
The right choice depends on your production estimate and contract terms. Ready to see how your own quote stacks up? Upload your solar quote for a free grade.
Frequently asked questions
Is a solar lease or PPA cheaper?
It depends on the escalator and actual production. In our hypothetical 25-year example with equal first-year cost, the PPA was cheaper at expected and lower output, but costlier if output ran 10% above expectation. Compare year-by-year payments, not first-year price.
What is the main difference between a solar lease and a PPA?
A lease charges a fixed monthly payment regardless of how much the system produces. A PPA charges a rate per kilowatt-hour produced. Both involve third-party ownership, 20 to 25 year terms and escalators, but they place production risk differently.
Who gets the tax credit with a lease or PPA?
The provider that owns the system claims it, not you. The federal 25D credit for homeowners ended for expenditures after 2025, but a provider may claim the commercial Section 48E credit and should pass value through lower rates. Ask how.
Can I buy my solar lease or PPA system?
Often yes at some point, typically at fair market value or a contract-specified price, whichever is higher. Buyouts are commonly unavailable in the first 5 to 6 years because of tax rules. Get the formula and timing in writing before you sign.
What escalator is reasonable?
EnergySage reports many agreements use 1% to 3% per year and says lower is better. Compare the escalator with realistic local utility rate growth and look at the year-25 payment, since compounding can roughly double a rate over the term.
Sources
- EnergySage — Solar leases vs. solar PPAs: what's the difference?
- Clean Energy States Alliance and NYSERDA — New York State Homeowner's Guide to Solar Leases, Loans, and PPAs (2016)
- NREL — Homeowners Guide to Leasing a Solar Electric System (2014)
- Solar.com — Selling a home with leased solar panels
- EnergySage — Federal solar tax credit in 2026