Solar Loan vs Lease vs PPA: 2026 Financing Comparison

Solar financing in 2026 looks nothing like it did in 2024. The residential 25D Investment Tax Credit — the 30% federal credit homeowners used to take when they bought a system outright — expired at the end of 2025. The 48E commercial credit, which lease and PPA companies use, is still in place through 2032 (though it phases down starting in 2027 per the Inflation Reduction Act schedule).

That single change has flipped the financing decision for millions of households. A solar loan was almost always the cheapest option in 2024. In 2026, it's a real coin-flip — and the answer depends on your tax bracket, your home equity, and how long you plan to stay in your house.

Here's how the three main options actually compare, with real 2026 numbers from a typical 7 kW residential install.

The Three Financing Options at a Glance

A quick refresher on the structures:

Solar loan (you own the system). You borrow money from a bank, credit union, or specialty lender (Mosaic, Sunlight Financial, GoodLeap), pay the installer, and own everything from day one. You're responsible for maintenance, insurance, and any repairs after the workmanship warranty (usually 10-12 years).

Solar lease (you rent the equipment). A third party — Sunrun, Sunnova, Palmetto, or a regional lessor — owns the panels and installs them on your roof. You pay a fixed monthly rent for 20-25 years and consume the electricity the system produces. Maintenance is on them.

Power Purchase Agreement (PPA). Same ownership structure as a lease, but instead of a fixed monthly payment, you pay a per-kWh rate for whatever the system produces. If it's a cloudy month and the system makes less power, your bill is smaller.

Leases and PPAs are often grouped together as "third-party-owned" or TPO. According to Wood Mackenzie's 2025 U.S. Solar Market Insight report, TPO share of new residential installs jumped from 30% in early 2024 to about 52% by Q4 2025 — directly tied to the residential ITC sunset.

The 25-Year Cost Math on a 7 kW System

Let's run the numbers on a representative system: 7 kW DC, install cost $21,000 ($3.00/W blended national average per EnergySage's 2025 data), homeowner with a 12 cent/kWh utility rate escalating 3.5% annually, located in an average solar resource zip code producing ~10,200 kWh/year.

Solar loan (12-year, 6.99% APR, $0 down)

• Total amount financed: $21,000 (no federal credit available for 25D after 2025)
• Total payments over 12 years: ~$28,400
• Years 13-25 of system life: free electricity
• Estimated 25-year savings vs. doing nothing: $24,000-$31,000
• Cash flow: payment is roughly $200/month; year-1 savings on the electric bill are ~$125/month, so you're underwater by ~$75/month for the first 12 years before going strongly positive.

Solar lease (20-year, 2.9% annual escalator, $0 down)

• Year-1 monthly payment: ~$95
• Year-1 utility savings: ~$130, so net positive ~$35/month from day one
• Total lease payments over 20 years: ~$31,000
• Estimated 25-year savings vs. doing nothing: $8,000-$14,000
• After year 20: option to extend lease at fair-market rate, buy the system at FMV (typically $3,000-$6,000), or have it removed.

PPA (20-year, $0.13/kWh starting rate, 2.5% annual escalator)

• Year-1 effective monthly bill: ~$110 (varies with sunshine)
• Year-1 utility savings: ~$130, so net positive ~$20/month
• Total PPA payments over 20 years: ~$33,500
• Estimated 25-year savings vs. doing nothing: $6,000-$12,000

The loan still wins on lifetime savings — by roughly 2-3x. But the lease and PPA win on day-one cash flow and zero maintenance risk. For a homeowner who is cash-tight, planning to move in 8-10 years, or has no tax appetite to claim deductions, that day-one positive cash flow can matter more than long-run total savings.

If you want to see how these numbers shift for your specific zip code, system size, and utility rate, the EnergyScout solar savings calculator runs all three side-by-side.

Where Each Option Wins

Solar loan wins when:

• You plan to stay in the home 10+ years
• You have decent credit (680+) and can qualify for sub-7% APR
• You want maximum lifetime savings and don't mind owning the maintenance risk
• You're in a state with strong net metering or a robust battery incentive (CA SGIP, MA SMART, CT/MA/RI ConnectedSolutions) — these benefits flow to the system owner

Solar lease wins when:

• You want zero upfront cost and zero maintenance hassle
• Your tax liability is low (retirees, low-income households) so a tax credit wouldn't help anyway
• You're risk-averse about panel performance and warranty claims
• The lessor's escalator is 1.9% or lower (the cheaper end of the market — Sunrun and Palmetto both offer flat-rate options in some states)

PPA wins when:

• You live in a state with high but variable utility rates (Hawaii, parts of CA and NY)
• Your roof has unusual shading or orientation and you want production risk on the lessor, not yourself
• The PPA rate locks in 30-50% below your current utility rate from day one

For an apples-to-apples comparison of state programs that affect the math, EnergyScout's incentive search is filtered by zip code and lets you toggle between owned and TPO eligibility.

What Most Homeowners Get Wrong

Four pitfalls show up in nearly every household financing decision we review:

1. Ignoring the escalator. A 2.9% annual escalator on a 25-year lease compounds aggressively. Your $95/month payment in year 1 becomes $185/month in year 25. Always model the full escalator curve, not just the first-year payment. According to the Lawrence Berkeley National Laboratory's Tracking the Sun report, a 2.9% escalator is the U.S. average, but 1.9% and even 0% (flat-rate) leases exist — they just require shopping.

2. Misunderstanding the home-sale issue. Owned solar (loan-financed or paid cash) typically adds resale value — Zillow's 2023 study found 4.1% premiums on solar homes. Leased and PPA systems are not the same: they require lease assumption by the buyer, which can complicate or even kill a sale if the buyer's lender objects. The Federal Trade Commission's 2024 solar advisory flagged this as a top consumer complaint area.

3. Not stress-testing the loan rate. A 6.99% loan in 2024 looked great. The same product underwritten in 2026 with the post-ITC pricing may push your monthly payment past your utility savings — meaning you're worse off than doing nothing. Run the math at 7.5% and 8.5% before signing.

4. Forgetting batteries. A loan-financed system with battery may still qualify for the 25D credit on the battery portion alone in 2026 (the IRS extended residential battery credit eligibility under specific conditions — check current IRS guidance and consult a tax pro). For lease and PPA structures, the battery is the lessor's, and the 48E commercial credit applies on their side, generally lowering the per-kWh rate they offer you.

Three Questions Before You Sign Anything

1. Who owns the system after 20 years? With a loan, you do. With a lease/PPA, you have an option to buy at fair market value (typically $3-6K), extend the agreement, or have the system removed. Get the buyout price formula in writing.

2. What happens if I sell the house? Loan: pay off the loan or transfer it. Lease/PPA: the buyer must qualify and assume the agreement. The lessor's transfer fees range from $0 (Sunrun) to $500+ (some regional players).

3. What's the workmanship warranty length? Loan: 10-12 years from a reputable installer. Lease/PPA: typically 25 years bundled into the agreement. This is one of the strongest arguments for TPO if you don't want to worry about a roof penetration leaking in year 14.

The Bottom Line

In the post-25D world, the financing question is no longer "which option is cheapest?" — it's "which option fits my actual life?" Loans still produce the most lifetime savings for committed long-term homeowners. Leases and PPAs offer day-one positive cash flow and zero hassle, at the cost of about half the long-run upside.

Before you sign, run your own zip code through the EnergyScout solar savings calculator, and compare any installer offer against our vetted installer guide. The financing structure matters less than picking a competent installer and a fair rate — those two things drive 80% of the outcome.

Sources

1. Wood Mackenzie / SEIA — U.S. Solar Market Insight 2025 Year in Review
2. EnergySage — Average Solar Panel Cost in 2025
3. Lawrence Berkeley National Laboratory — Tracking the Sun 2024 Edition
4. Federal Trade Commission — Solar Deception: 2024 Enforcement Spotlight
5. NREL — U.S. Solar Photovoltaic System and Energy Storage Cost Benchmarks
6. DSIRE — Database of State Incentives for Renewables & Efficiency