Solar Financing Compared: Cash, Loans, Leases and PPAs

Choosing how to pay for a home solar system can feel as complicated as picking the panels themselves. The Clean Energy States Alliance’s 2018 homeowner’s guide to solar financing explains that the marketplace has grown increasingly complex, with contracts full of technical jargon and key terms buried in fine print. Understanding the basic structures, cash, loans, leases, and power purchase agreements, helps you compare offers on a level playing field before you sign anything.

Cash purchase: own outright with no interest

According to the Clean Energy States Alliance (CESA) guide, a direct, upfront cash purchase is typically the least expensive option in total dollars because no interest costs or finance fees are incurred. The homeowner owns the system from day one and can take advantage of any available federal, state, or utility incentives. However, the guide notes that many households do not have enough cash on hand to pay for a system outright, and even those who do may prefer to finance and invest the cash elsewhere.

When you own the system, you are responsible for maintenance, insurance, and any production shortfalls. The CESA guide points out that solar panels generally require little maintenance, but issues like loose wiring, inverter failure, or panel damage can arise over the system’s lifetime. A homeowner who pays cash may want to look into extended warranties or check whether their existing homeowner’s insurance covers the array. For more on what ownership entails, see our Ownership and Warranties page.

Solar loans: own with borrowed money

Solar loans let you spread the system’s cost over time while retaining ownership. The CESA guide describes several loan types. A secured loan, such as a home equity loan, uses your home as collateral. An unsecured loan may only use the solar system itself as security. In a few jurisdictions, Residential Property Assessed Clean Energy (R-PACE) programs allow repayment through an assessment on your property tax bill; the obligation attaches to the property rather than to you personally, which can simplify a home sale before the loan is paid off. Lenders can be banks, credit unions, utilities, state programs, or solar developers.

Because you own the system with a loan, you are eligible for federal and state incentives that third-party ownership arrangements cannot claim. The CESA guide emphasizes that interest on a home-equity-based solar loan may also be tax deductible, though you should confirm with a tax professional. On the flip side, you bear the risks of ownership: maintenance, repairs, and any production shortfalls fall on you unless covered by warranties or insurance.

The Consumer Financial Protection Bureau (CFPB) issued a consumer advisory in 2024 warning that solar loans can carry hidden markups. The CFPB found that sellers sometimes add “dealer fees” to the loan, inflating the total amount you borrow while making the interest rate look artificially low. Salespeople may also subtract a projected tax credit from the loan amount shown to you, making the price appear smaller than what you are really borrowing. The CFPB notes that loan terms often include a payment jump after 18 months unless you make a lump-sum payment equal to the projected tax credit, whether or not you actually receive that credit. The advisory urges homeowners to ask for the cash price of the system, shop around with multiple installers and lenders, and get a written breakdown of all work and costs. An independent energy auditor, unaffiliated with any lender or installer, can review proposals with you. For a broader look at what drives system pricing, visit our Cost Factors article.

Solar leases: scheduled payments, third-party ownership

Under a solar lease, a developer installs and owns the system on your roof. You pay scheduled, usually monthly, lease payments for the right to use the electricity it produces. The CESA guide says a typical lease term runs 15 to 20 years. Most leases cover routine maintenance, but the guide cautions that replacement of equipment like the inverter may not be included, so you need to check the contract carefully.

Because you do not own the panels, any federal or state incentives go to the leasing company, not to you. The CESA guide also explains that a lease payment is fixed regardless of how much electricity the system actually generates. If production falls short of estimates, you still owe the same payment, which can erode your expected savings. Some leases include a minimum production promise that compensates you for a shortfall, but you should verify whether that compensation is based on a wholesale or retail electricity rate.

Many leases contain an escalation clause that increases your payment each year. The CESA guide notes that this escalator compounds, meaning it applies to the previous year’s increased amount, not just the original payment. Before signing, ask for a year-by-year payment schedule so you can see the full cost over the term. Also look for buyout options and home ownership transfer provisions; selling a home with a leased system can be more complicated, and a buyer may need to qualify to take over the lease. For help understanding how a system fits your home, see our Installation Planning guide.

Power purchase agreements (PPAs): pay per kilowatt-hour

A residential solar PPA is similar to a lease in that a third-party developer owns and maintains the system, but instead of fixed lease payments you buy the electricity the system produces at a set per-kilowatt-hour rate. The CESA guide states that this rate is typically competitive with your local utility’s retail rate, and because it is locked in for the contract term, you are insulated from future utility rate increases. You only pay for the power the system actually generates, so underperformance hurts less than it does under a lease.

As with a lease, the PPA provider, not you, claims any tax credits or state incentives. The CESA guide advises that not all states allow third-party PPAs, so you should check whether this option is available where you live. Escalation clauses can also appear in PPAs, gradually raising the per-kilowatt-hour price. The guide recommends comparing the proposed rate and escalator to your current electricity rate and asking the contractor to calculate projected annual savings. The standardized PPA contract template endorsed by the Solar Energy Industries Association can be a useful reference, but terms vary, so scrutinize the contract. For more on how solar interacts with your utility bill, read our Rooftop Solar overview.

Who receives the incentives?

The CESA guide makes clear that the federal investment tax credit and most state incentives, such as Solar Renewable Energy Certificates, go to the owner of the solar system. If you pay cash or take out a loan, you own the system and can claim those benefits. Under a lease or PPA, the third-party owner receives the incentives. Because incentive programs change, always check current official sources for the latest details on tax credits, rebates, and performance-based payments before deciding which path to take. Our Home Solar Costs and Decisions section can help you weigh the financial trade-offs.

Scams and false promises to watch for

The Federal Trade Commission (FTC) warns that scammers often promise free or no-cost solar panels, huge rebates, or government-backed programs that do not exist. The FTC alert says the federal government does not install solar systems in homes for free. Legitimate businesses and government agencies will not pressure you to act immediately or demand payment by cash, gift card, wire transfer, or cryptocurrency. The FTC also advises against responding to unexpected online requests for personal information to “see if you qualify,” as these may be lead-generation schemes or identity theft attempts.

California’s Public Utilities Commission (CPUC) publishes a Solar Consumer Protection Guide that lists specific false claims reported in that state. The CPUC says any salesperson who tells you that you can get free solar energy at no cost, that you will never pay an electricity bill again, or that you must sign immediately is not being truthful. The CPUC also flags the illegal suggestion that a homeowner can register as a limited liability company to claim business tax credits for a residential system. While the CPUC guide is specific to California, the types of misleading pitches it describes can appear anywhere, and the advice to get at least three bids, check contractor licenses, and take your time before signing applies universally.

Questions to ask before signing any solar contract

Drawing on the CFPB advisory and the CPUC guide, here are practical steps to protect yourself:

• Ask for the cash price of the system separate from any financing. If a salesperson cannot give a straight answer, consider obtaining financing from a bank or credit union and bringing that loan offer to the installer.
• Request a written breakdown of all work, materials, and costs. An independent energy auditor can review the proposals with you.
• Get bids from at least three different solar providers. The CPUC notes that the cheapest bid is not necessarily the right choice; a very low bid may indicate corner-cutting.
• Check the contractor’s license and, if a door-to-door salesperson contacted you, their home improvement salesperson registration number. Verify they are current and valid.
• Read the contract carefully for escalation clauses, buyout options, minimum production promises, and home transfer provisions. Ask for a year-by-year payment table if an escalator is included.
• Understand how your electricity bill will change after installation and whether you will have a separate monthly payment to a lender or solar provider.
• Never sign under pressure. The CPUC reminds California consumers that they have at least a three-day right to cancel a contract signed at home.

Financing options at a glance

For a deeper dive into each option and how it fits your household’s energy profile, see our Household Energy Use article.

Frequently asked questions

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

According to the CESA guide, a solar lease involves fixed, scheduled payments to use the system’s electricity, while a PPA charges you only for the kilowatt-hours the system actually produces. Under a lease, you pay the same amount even if production is low; under a PPA, your payment drops when output drops. Both leave ownership and incentives with the third-party developer.

Do I still get tax credits if I lease solar panels or sign a PPA?

No. The CESA guide states that the federal investment tax credit and most state incentives go to the system owner. In a lease or PPA, the third-party company owns the system and claims those benefits. If you want to receive incentives directly, you need to own the system through a cash purchase or a loan.

How can I avoid hidden costs in a solar loan?

The CFPB advisory recommends asking for the cash price of the system before discussing financing, so you can see if dealer fees are inflating the loan amount. Compare loan offers from multiple lenders, not just the one the installer suggests. Get a written breakdown of all costs and have an independent energy auditor review the proposal. Be wary of any sales pitch that subtracts a projected tax credit from the loan amount to make the price look smaller.

For more guidance on comparing payment methods and understanding contract terms, visit our Financing Considerations page.

Sources

• Clean Energy States Alliance: A Homeowner’s Guide to Solar Financing (2018 update)
• Consumer Financial Protection Bureau: Consumer advisory on solar loans (2024)
• Federal Trade Commission: How to avoid getting burned by solar or clean energy scams (2024)
• California Public Utilities Commission: California Solar Consumer Protection Guide (2026)