Solar Loan vs Lease vs PPA

Four ways to pay for solar, and the choice determines who owns the system, who receives its benefits, and how complicated your eventual home sale becomes.

The four options

Cash

Buy it outright.

Best return, because there's no financing cost. Every kilowatt-hour is pure savings after the initial outlay.

The considerations are opportunity cost — what else that money could do — and the fact that payback takes years, so the capital is committed.

Loan

You own the system and borrow against it. The most common route for owner-occupiers who don't want to pay cash.

Advantages:

• You own the asset and keep the full value of what it produces
• You receive any incentives you qualify for
• Once repaid, energy is effectively free for the system's remaining life
• Home sale is straightforward — pay off or transfer the loan

What to check:

• The interest rate, compared against financing you could obtain independently
• Dealer fees. Some low-advertised-rate solar loans carry a fee built into the system price. A higher-rate loan on a lower system price can be cheaper overall — compare total cost, not the rate.
• Term length relative to the equipment's life
• Whether payments step up after an assumed incentive is applied. Some loans assume you'll make a lump-sum payment from an incentive; if you don't qualify or don't receive it, payments increase.

That last point catches people. Confirm your incentive eligibility yourself with the program before signing a loan structured around it.

Model it with the solar loan calculator.

Lease

A third party owns the system on your roof. You pay a fixed periodic amount for the equipment regardless of how much it produces.

Advantages: little or no upfront cost, provider handles maintenance and repairs, no performance risk on you.

Disadvantages:

• You don't own the asset — at end of term you have nothing
• The provider receives the incentives, which is part of how the model works
• Escalator clauses commonly raise payments annually
• You pay regardless of production — a shaded or underperforming system still bills you
• Long terms, often 20-plus years
• Home sale complications

Power purchase agreement (PPA)

Similar to a lease, but you pay per kilowatt-hour produced rather than a fixed amount.

The distinction matters: under a PPA, if the system underproduces you pay less. That aligns incentives slightly better than a lease.

Otherwise the same considerations apply — no ownership, provider takes the incentives, escalators, long term, sale complications.

Escalator clauses: read them carefully

The term that most often turns a good-looking lease or PPA into a poor one.

An escalator raises your payment by a set percentage annually. Over a 20-plus year term, compounding makes that substantial.

The critical comparison: does the escalator outpace your electricity price growth?

• If your rates rise faster than the escalator, your savings grow
• If rates rise slower, your savings shrink — and can eventually reverse, leaving you paying more for solar than you'd have paid the utility

Nobody knows future rate trajectories, which is exactly why a high escalator is a risk transferred to you. A flat or low escalator is meaningfully better than a high one, and it's a negotiable term.

Model both scenarios before signing. See electricity rates by state.

The home sale problem

The most common practical regret with third-party ownership.

When you sell:

• The buyer must typically qualify and agree to assume the lease or PPA — an extra hurdle and another party's credit approval
• Or you buy out the contract, which can be expensive
• Or the equipment is removed, sometimes at cost

Any of these can delay a sale or reduce your pool of buyers. Some buyers simply won't take on a long third-party agreement.

Owned systems transfer with the property and are generally straightforward, provided you have the documentation.

If there's any chance you'll move during the term, weigh this heavily. See solar and home resale value.

Loan, lease or PPA — which should you choose?

Cash — best return if the capital is available and you're comfortable committing it.

Loan — the usual right answer for owner-occupiers. You own the asset, keep the benefits, and the home sale stays simple. Just compare total cost including fees, not the advertised rate.

Lease or PPA — worth considering if you can't use incentives, can't access reasonable financing, or genuinely want no maintenance responsibility. Read the escalator and the transfer terms very carefully, and understand you're renting your roof to someone else's asset.

Questions before signing anything

1. Who owns the system, and who receives any incentives?
2. What's the total cost over the full term, not the monthly payment?
3. Is there an escalator, and at what rate?
4. What happens when I sell? Get the transfer process in writing.
5. What happens at end of term — removal, purchase option, renewal?
6. Who's responsible for the roof if a leak develops at a mount?
7. Who handles maintenance and repairs, and what's the response commitment?
8. What if it underperforms the estimate — is there a production guarantee?
9. Is there a buyout option, and how is the price calculated?

Get answers in writing. A salesperson's summary is not a contract term.

Separate the two decisions

Evaluate the system and the financing independently.

A good system on poor financing is a poor deal, and a heavily-marketed financing package can obscure a mediocre system. Get the system priced and specified first, then compare financing — including options your installer doesn't offer.

See choosing a solar installer and how solar payback works.

The bottom line

Cash gives the best return, a loan is usually the right answer for owner-occupiers because you own the asset and keep its benefits, and leases and PPAs trade ownership away for low upfront cost. Read escalator clauses closely — a high one can erase your savings over a long term — and understand the transfer process before signing, because third-party contracts are the most common reason a solar home becomes harder to sell.

Model financing with the solar loan calculator, check returns with the solar panel payback calculator, or read solar and home resale value.