Solar Lease and PPA Escalators in Tucson

What the tactic actually is

Solar leases and Power Purchase Agreements are sold on a simple promise: no money down, a payment lower than your electric bill, and none of the headaches of ownership. What the pitch does not lead with is that you also give up the tax credits — they stay with the third-party owner who owns the system on your roof — and that the agreement frequently contains annual payment escalators of 1 percent to 3 percent that quietly erode the savings you were shown. The savings figure in the presentation is a first-year number. The contract is a twenty-year number.

None of this makes leasing dishonest by itself. It makes the sales comparison dishonest when the first-year payment is compared against a utility bill as though the payment will never change. A homeowner comparing a fixed electric bill projection against a payment that grows every year for twenty years is not comparing like with like, and the escalation clause is exactly why.

Who owns the system owns the credit

In a lease, sometimes called a straight solar lease, you contract to lease panels for a fixed period rather than buy them. In a Power Purchase Agreement you pay a predetermined rate per kilowatt-hour for the electricity the system produces. In both structures the third-party owner owns the equipment — which is the whole point of the arrangement, and also the whole catch.

Ownership determines who can claim the federal credit. A homeowner who buys a system outright has historically been the party eligible for the residential clean energy credit. In a lease or PPA that credit belongs to the company, and the company instead may qualify for the commercial clean electricity credit available to business owners of generation equipment — if it meets the requirements. Some providers factor part of that benefit into lower monthly payments. It is not an automatic dollar-for-dollar pass-through, and there is no line on your statement showing your share of it.

The 2026 context sharpens this considerably. The residential clean energy credit is no longer available to homeowners for systems placed in service after December 31, 2025. That removes the old trade-off entirely: there is no longer a homeowner-side credit waiting for you if you buy instead of lease. The value of a lease or PPA now has to stand on the payment stream alone — compared honestly against buying the same system with cash or a loan, using total dollars over the full term. When a representative tells you the lease "keeps the tax credit working for you," what is actually happening is that the credit belongs to the company and appears nowhere in your documents.

Who owns the system, who claims the incentive, who carries the risk

The commercial credit available to a third-party owner is not an automatic pass-through. Some providers reflect part of it in your monthly payment; it does not appear as a credit to you anywhere.

The escalator, in dollars

An escalator is a contractual annual increase in your payment. The percentages sound trivial, and in year one they are. Start with a $120 monthly payment on a 25-year agreement and watch what a 1, 2, or 3 percent escalator does to the payment you will actually be making in the final years, and to the total you will have handed over.

What an annual escalator does to a payment over 25 years

Illustration on a $120 starting monthly payment over 25 years. Lease and PPA escalators commonly fall in the 1% to 3% range; your contract is what determines yours.

The right-hand column is the comparison homeowners never get shown. Against a flat contract at the same starting payment, a 3 percent escalator adds over $16,000 across the term, and a 2 percent escalator adds over $10,000. Those are the "savings" quietly leaving the arrangement.

The escalation is also back-loaded in a way that is easy to miss, because the early years look close to flat. On a $120 payment with a 2 percent escalator you have paid about $7,494 after five years against $7,200 on a flat contract — a difference of only $294 that is easy to shrug off. By year ten you are $1,368 behind. By year fifteen, $3,303. By year twenty, $6,188. By the end of year twenty-five you have paid $46,124 instead of $36,000, and the final-year payment is $193.01 rather than $120. Nothing dramatic happens in any single year. That is precisely why it works.

What these agreements cost you beyond the payment

The payment stream is the visible cost. Three others matter as much and are rarely volunteered.

First, the term. Leases commonly run 15 to 20 years and PPAs can run from 6 to 25. Tucson Electric Power residential solar customers must take service on a Time-of-Use pricing plan, and export compensation for new interconnections runs through the Resource Comparison Proxy export rate, with a customer's initial RCP rate applying for ten years from interconnection. A twenty-year agreement therefore spans the end of that ten-year rate lock and a decade of rate design nobody can forecast today. If your lease payment escalates on a fixed schedule while your export credit does not, the back half of the contract is where the arithmetic turns against you.

Second, the sale of your home. If you sell before the term ends, the buyer generally has to assume the agreement and qualify for it — or you buy the system out. Both outcomes reduce your negotiating room. A solar lease attached to a house is a complication a buyer's lender has to underwrite, and buyout figures are set by the owner, not by you.

Third, the end of term. At the end of a lease, the lessor is responsible for uninstalling and removing the panels, which sounds like a benefit until you realise it leaves you with a roof full of penetrated flashings and a company that has no further obligation to you. Ask, in writing, what the removal scope covers and who repairs the roof afterwards. Ask also what your options are at term — renewal, purchase, or removal — and at what price, before you sign.

The terms and questions that expose the real deal

Nothing on this list is unreasonable to ask for. Every item is either in the contract already or is missing on purpose.

• The full payment schedule for all years, printed. Not the first-year payment, not a projection. If the schedule is not attached, the escalator is the reason.
• The escalator percentage and its first increase date, stated in the contract in plain language rather than buried in a definition.
• A written statement of who owns the system and who claims any federal or state incentive connected to it.
• The total of payments over the term, and that same figure for a purchase comparison of the identical system.
• The buyout formula at year 5, year 10, and at term, and whether it is fixed or set at the owner's discretion.
• Whether the agreement transfers automatically on sale, and what happens if your buyer will not or cannot assume it.
• Guaranteed production language, and exactly how a shortfall is measured and paid. A production guarantee is worthless without a defined measurement method.
• End-of-term removal scope, roof repair responsibility, and any charge attached to either.

Terms to demand in writing before signing a lease or PPA

What to do instead

Price the same system three ways before you commit: cash, a loan you shopped yourself, and the lease or PPA on offer. Then compare total dollars over a matched number of years, not monthly payments in year one. If the lease only wins on the first-year payment, it does not win.

If you do choose a lease or PPA, negotiate the escalator. It is a contractual term, not a law of physics, and agreements exist with escalators at the lower end of the range or with none at all. Ask what a flat-payment version costs and get the answer in writing, because the difference between a flat schedule and a 3 percent escalator is the single largest swing in the whole contract.

Confirm with Tucson Electric Power that the interconnection will be in the structure you have been promised, and make sure you understand which party holds the interconnection agreement and receives the export credit. Keep the signed agreement, the full payment schedule, the production guarantee, and the disclosure of who claims the incentives in one file. Ask about the agreement before you need it — at the point of sale, when the person on the other side of the table still wants your signature, is the only moment you have real leverage.