Solar Lease vs PPA: The Difference That Matters

Q: Do solar leases have a production guarantee?

Many do, and it is the single most important clause in the document. Because a lease payment is fixed, underproduction is your loss unless the contract promises a minimum annual output with a defined remedy. Look for the guaranteed kWh figure, the degradation schedule, and how production is to be measured.

Q: Who owns the solar panels in a lease or PPA?

The provider owns the equipment in both. You are either renting it or buying its output. That is also why the federal tax credit goes to the provider rather than to you under both structures.

Q: Can I get out of a solar lease or PPA?

Usually only by buying out the remaining term, transferring the agreement to a buyer when you sell the home, or reaching the end of the term. Both are long contracts, in the 20 to 25 year range, which is why the production terms deserve reading before signing rather than after.

The textbook answer is that a lease rents you equipment and a PPA sells you electricity. True, and not the part that decides whether you are happy in year eight. The real difference is who carries the risk that the system underproduces — and the answer flips depending on which one you signed.

The Mechanical Difference

	Solar lease	Power purchase agreement
You pay for	The equipment, monthly	The electricity, per kWh
Payment if output drops	Unchanged	Falls with production
Who owns the panels	The provider	The provider
Who gets the tax credit	The provider	The provider
Term length	20–25 years	20–25 years
Carries production risk	You	The provider

Why That Last Row Is the Whole Article

Under a PPA, the provider is paid for kilowatt-hours delivered. If the array underproduces, their revenue falls with it. Their incentive to keep the system healthy is structural rather than contractual, which is a genuine and underrated advantage.

Under a lease, your payment is fixed. It is the same in a year the system produces 12,000 kWh and a year it produces 10,000. The provider's revenue is unaffected by how the array performs. Every kilowatt-hour the system fails to produce is money you paid for and did not receive, and nothing in the payment structure will ever tell you it happened.

That asymmetry is why a production guarantee matters far more in a lease than in a PPA. It is the only thing standing between you and a fixed payment for a declining asset.

The Clause to Find Before You Sign Either One

Skip to the production section. You are looking for four things, and their absence is as informative as their presence:

A guaranteed annual production figure, in kWh. Not an "estimate", not a "projection" — a number the provider commits to. If the document only ever says "estimated", there is nothing to enforce.
A degradation schedule. The guarantee should decline over time, commonly in the 0.5–0.75% a year range. A guarantee with no schedule is ambiguous by year five, and ambiguity favours whoever drafted it.
A remedy. What actually happens if the system misses. A payment at a stated rate per missing kWh is meaningful. "The provider will use commercially reasonable efforts to investigate" is not.
How production is measured, and by whom. In these structures it is the provider's own monitoring. Worth knowing before a dispute rather than during one.

For the full list of drafting patterns worth catching, see solar production guarantee contract red flags.

The Failure Mode Nobody Warns You About

It is not that the system breaks. It is that it quietly delivers less than the contract promised, for years, while every party involved considers the arrangement to be working normally.

Take a leased 10 kW system with a guaranteed 12,000 kWh a year. It delivers 10 800 — a 10% shortfall. Nothing has failed. The monitoring app shows a healthy system. Your lease payment does not change. The provider has no reason to look. At a $0.31/kWh net-metering credit that gap is roughly $372 a year, and across a 20-year lease something in the region of $7,400. That is a worked example, not a claim about any particular contract. The figures depend on your system, your rate, and what your document actually guaranteed.

If your lease carries a production guarantee, that shortfall is not merely disappointing — it is a term of the agreement that has not been met, with a remedy written into the contract you signed. Enforcing it requires exactly one thing you do not currently have: an independent record of what the system should have produced.

Third-Party Ownership Has One More Wrinkle

Because the provider owns the equipment in both structures, they also control the monitoring platform reporting on it. That is not an accusation of bad faith; it is simply the shape of the arrangement, and the same shape exists in most vendor-run monitoring. It does mean the party measuring performance is the party whose obligation is measured.

It also matters when you sell the house. Both agreements either transfer to the buyer or require a buyout, and a system with a documented production history is materially easier to hand over than one with an unexplained gap between promise and delivery.

Check your own number in about a minute. Our free solar production calculator models what a system of your size, orientation and age should generate at your ZIP code, from five years of measured local irradiance rather than the provider's projection. No signup and no email required. Compare it against the guaranteed figure in your lease or PPA and against what you actually produced last year. If all three agree, the arrangement is doing what it promised. If your actual sits well below the guarantee, you are looking at a contract term that has not been met.

So Which Should You Choose?

If the choice is purely between the two structures and both documents are otherwise equal, a PPA puts the provider's revenue on the same side as your production, which is worth something real. A lease offers predictability, which is also worth something.

But the label is the smaller variable. A lease with a specific guaranteed kWh figure, a stated degradation schedule and a per-kWh remedy protects you better than a PPA with vague production language. Read the production section of both documents before comparing the monthly numbers — and if you already signed one years ago, that section is still worth finding today.

Frequently Asked Questions

What is the difference between a solar lease and a PPA?

A lease charges a fixed monthly amount to rent the equipment regardless of output. A PPA charges a per-kWh rate for the electricity produced. Under a lease you carry the production risk; under a PPA the provider does, because they are only paid for what the array delivers.

Which is better, a solar lease or a PPA?

Neither is universally better. A PPA aligns the provider's revenue with output. A lease gives a predictable bill. What matters more than the label is whether the contract states a guaranteed annual production figure and a remedy if it is missed.

Do solar leases have a production guarantee?

Many do, and it is the most important clause in the document. Because the payment is fixed, underproduction is your loss unless the contract promises a minimum annual output with a defined remedy. Look for the guaranteed kWh figure, the degradation schedule, and how production is measured.

Who owns the solar panels in a lease or PPA?

The provider owns the equipment in both. You are renting it or buying its output, which is also why the federal tax credit goes to the provider under both structures.

Can I get out of a solar lease or PPA?

Generally by buying out the remaining term, transferring the agreement when you sell the home, or reaching the end of the term. Both are long contracts, in the 20 to 25 year range, which is why the production terms deserve reading before signing.

Related Guides

On a lease or a PPA, the meter that bills you belongs to them.

OwlWatt measures your production independently and compares it against a weather-adjusted physics model, so you can check the number you are being billed on rather than take it on trust.