Solar leases and Power Purchase Agreements (PPAs) are often lumped together as "third-party solar" — and from a distance, they look identical. Both are $0-down 20–25 year contracts. Both mean the installer owns the panels. Both involve the installer claiming Section 48E while passing some savings to you through lower rates. The difference that actually matters is how you're billed: a lease charges a fixed monthly payment regardless of what the system produces, while a PPA charges you per kWh actually generated.
That billing difference determines who bears the risk if your system underperforms — and who benefits most when it overperforms.
Disclaimer: Lease and PPA terms vary significantly by installer and state. Numbers shown here reflect typical 2026 market structures — your specific offer may differ. Section 25D residential solar credits expired December 31, 2025. Section 48E applies to the installer under both lease and PPA structures. Always get 3+ competing offers before signing a 20–25 year solar contract.
Key Takeaways
- Lease: fixed monthly payment ($80–$150/mo typical) regardless of solar production; you bear production shortfall risk
- PPA: pay per kWh produced ($0.08–$0.12/kWh typical) — installer bears production risk since their revenue tracks output
- Both include escalator clauses of 1–3%/yr over 20–25 years — factor this into long-term savings estimates
- Section 48E (developer credit, active through 2027) is claimed by the installer under both structures
- Both structures include buyout options typically at years 5 and 10 — terms and pricing vary significantly
The Production Risk Difference
This is the practical heart of the lease-vs-PPA question.
Under a solar lease, your payment is fixed. If the system was projected to produce 10,000 kWh but produces only 8,500 kWh due to unexpected shading, equipment issues, or a cloudy year — you still pay $130/month (or whatever your lease rate is). You then buy the 1,500 kWh shortfall from your utility at full retail rate. The underperformance costs you real money in higher overall electricity expenses while your lease payment stays flat.
Most leases include a production guarantee — a contractual promise that if the system produces significantly below the projected estimate (typically 5–10% below), the installer will compensate you with a credit. But these guarantees vary in quality: some specify a dollar credit, others credit future months, and "significant" is defined differently across contracts. Read the production guarantee clause carefully before signing.
Under a PPA, your bill simply reflects actual production. If the system produces 8,500 kWh at $0.10/kWh, you pay $850 that year. You still buy the 1,500 kWh shortfall from the utility, but your PPA payment accurately tracks what you actually received. The installer has a financial incentive to maintain the system well, because their revenue scales with production.
Escalator Clauses: Same Problem, Different Structure
Both leases and PPAs include annual escalators. The mechanics differ slightly:
- Lease escalator: Your fixed monthly payment increases by a set percentage each year (typically 1–3%). Starting at $120/month with a 2.9% escalator, you're paying roughly $192/month by year 20 — a 60% increase.
- PPA escalator: The per-kWh rate you pay increases by a set percentage each year. Starting at $0.10/kWh with a 2.5% escalator, you're paying roughly $0.163/kWh by year 20.
The escalator logic is the same in both cases: the installer is pricing in assumed utility rate increases, betting that their escalating rate will still be below your utility rate in 15–20 years. For high-electricity-rate states (California, Hawaii, New York, Massachusetts), that bet has historically been sound. For moderate-rate states (Texas, Florida, Washington), it's less certain.
| Feature | Solar Lease | Power Purchase Agreement (PPA) |
|---|---|---|
| Payment structure | Fixed monthly ($80–$150/mo) | Per kWh produced ($0.08–$0.12/kWh) |
| Production risk | You (fixed payment regardless of output) | Installer (revenue tracks production) |
| Escalator structure | Monthly payment increases ~1–3%/yr | Per-kWh rate increases ~1–3%/yr |
| Monthly bill predictability | High — exact same payment every month | Lower — varies with seasonal production |
| Who benefits if system overproduces? | You — same payment, more offset | Installer — you pay more; you also save more on utility |
| Contract length | 20–25 years typical | 20–25 years typical |
| Home sale impact | Requires transfer or buyout | Requires transfer or buyout |
Section 48E: Both Structures Work the Same Way
Under both a lease and a PPA, the installer owns the solar system on your roof. That ownership qualifies the installer for the Section 48E investment tax credit (30% of installed cost, active through 2027). You don't own the system, so you can't claim 48E — and the expired Section 25D required ownership, which neither structure provides.
The installer's Section 48E credit reduces their cost basis by roughly $7,000 on a $23,000 system. Competitive market pressure passes some portion of this saving to you as a lower monthly lease payment or lower PPA rate. How much is passed through versus retained in margin is not disclosed in consumer contracts — there's no regulatory requirement for transparency on this point.
Buyout Options: Year 5 and Year 10
Both leases and PPAs typically include contractual purchase options that allow you to buy the system at specific points in the contract. Standard buyout windows are at years 5 and 10, with the buyout price based on the system's "fair market value" at that time.
What "fair market value" means in practice varies by contract. Some contracts specify a buyout price schedule upfront. Others define it as whatever an independent appraiser determines — which introduces uncertainty. If the contract just says "fair market value," ask the installer to show you a historical example of what their buyout prices have looked like in practice.
Buying out the lease or PPA converts you from a monthly payer to an owner — from that point, energy savings flow entirely to you without any escalating payment. This is often financially attractive in years 7–12 if your electricity rate has risen and the buyout price is reasonable.
Which Is Better: Lease or PPA?
Choose a PPA when:
- Your roof has shading, a challenging orientation, or any production uncertainty — you want billing that tracks actual generation
- Your utility rate is high (California, Hawaii, New York) — a below-market PPA rate represents substantial guaranteed savings
- You want the installer to have maximum financial incentive to keep the system performing
Choose a lease when:
- You want a predictable fixed monthly payment for budgeting
- You're confident in your roof's production potential (south-facing, unshaded)
- The lease rate converts to a lower effective per-kWh cost than the PPA rate being offered — always calculate the effective rate on both
Use the Solar Lease vs Buy Calculator to compare the 25-year cost of any specific lease or PPA offer against purchasing the same system.
Wondering if buying outright makes more sense? The Solar ROI Calculator models owned-system payback using your electricity rate and sun hours so you can compare directly to any lease or PPA quote.
Bottom Line
For most homeowners with production-uncertain roofs or high utility rates, a PPA's per-kWh billing structure is more protective and aligns installer incentives with your interests. For homeowners who value payment predictability and have confidence in their roof's output, a lease is simpler. In both cases, compare the effective per-kWh cost across multiple installers before signing — rates vary more than the structure itself.
Related Guides
- Solar Lease Fine Print Guide 2026 — Escalator clauses, home-sale complications, and insurance gaps explained.
- Solar PPA vs Lease: Key Differences 2026 — Deeper dive into the payment structure mechanics.
- Sunrun Solar Review 2026 — Largest U.S. lease and PPA provider reviewed.
- Solar Financing for Bad Credit 2026 — Options when you can’t qualify for traditional solar loans.
