Patricia Moore
The 30% federal tax credit that defined residential solar for thirty years is gone. The One Big Beautiful Bill Act, signed July 4, 2025, killed the Section 25D homeowner credit for systems installed after December 31, 2025. Most coverage since then has focused on the loss. What it’s missed is the opening: leases and PPAs are now the only residential financing path that still touches federal solar incentives, and they’re structured completely differently from the buy-and-own model most homeowners have been taught to evaluate.
If you’re shopping solar in 2026, you need a different framework.
Why Third-Party Ownership Is Having a Moment
Third-party systems work like this: a solar company owns the panels on your roof and you pay either a fixed monthly lease or a per-kilowatt-hour rate through a power purchase agreement. They access the 30% Investment Tax Credit under Section 48E, which runs through at least the end of 2027. The installer claims it; you benefit indirectly through lower rates. It’s not as clean as a direct credit, but it’s the only federal lever left for residential solar this year.
The market is already repricing around this shift. BloombergNEF projects the U.S. will add just 4.1 GW of residential solar in 2026, down 15% from 2025 and the lowest in five years. That contraction is real, but concentrated in owner-purchased systems. Third-party volume is holding up better precisely because the Section 48E pathway remains intact. Installers who used to push cash purchases are now leading with lease and PPA pitches because that’s where they can still offer a compelling headline number.
That matters for you. Installers have reasons to push certain products. You need to know how to size and structure the deal before you sit down with them.
Sizing for a Lease or PPA Is Different Than Sizing to Own
When you buy a system, the math is straightforward: cover as much of your load as possible, maximize self-consumption, and the payback period does the rest. A larger system usually wins.
With a third-party system, the calculus changes completely. You’re locking in a rate, not a capital investment. Oversizing costs you money in two ways. Most lease and PPA contracts give you a fixed or escalating monthly payment regardless of how much energy you actually use. Second, surplus energy you export to the grid under net billing structures, which now dominate in California and are spreading elsewhere, returns far less than retail. California’s shift away from 1:1 net metering already pushed residential battery attachment rates to 69% in that state. Exporting excess generation under a PPA means you’re effectively subsidizing your utility.
The right sizing target for a third-party system in 2026 is your baseload consumption, not your peak. Pull 12 months of utility bills, calculate your average monthly kilowatt-hours, and design to cover roughly 80 to 90 percent of that. Not 110 percent. Every kilowatt-hour you overproduce and export under most current net billing tariffs is a kilowatt-hour you’ve paid the installer for (through lower PPA rates on your whole system) and recovered pennies on.
Helpful resource: Renogy 100W 12V Flexible Solar Panel is a top-rated option for this. (As an Amazon Associate this site earns from qualifying purchases.)
The Contract Terms That Actually Matter
How To Size A Solar System For Your House! Examples and Calculations · Country Living Experience: A Homesteading Journey on YouTube
| Metric | Lease/PPA Systems | Owner-Purchased Systems |
|---|---|---|
| Federal Incentive Available (2026) | 30% ITC (Section 48E, via installer) | None |
| Sizing Target | 80-90% of baseload consumption | Maximum load coverage |
| Contract Length | 20-25 years | N/A |
| Typical Annual Rate Escalator | 2-3% | N/A |
| Production Guarantee | ~90% of projected output | N/A |
| Exported Energy Recovery | Net billing rates (pennies per kWh in most states) | Full retail rate or 1:1 net metering (varies by state) |
| SREC Program Value | Accrues to installer; should reduce rate | Accrues to homeowner |
| Buyout Timing Risk | High in years 1-3 | N/A |
Lease and PPA contracts run 20 to 25 years. That’s the sentence installers bury.
The escalator clause is the biggest variable. Most contracts include an annual rate increase of 2 to 3 percent. At 2.9 percent annually, your PPA rate in year 15 is 53 percent higher than in year 1. That’s not inherently bad if your utility rate climbs faster, which historically it has, but you’re making a 25-year bet on that spread. Ask for the fixed-rate option if one exists; some installers offer it at a slightly higher starting rate.
Production guarantees matter more than most homeowners realize. A well-structured lease guarantees a minimum annual kilowatt-hour output, typically around 90 percent of the projected amount. If the system underperforms, the installer owes you a credit. If there’s no production guarantee in the contract, you bear all weather, shading, and degradation risk while still making monthly payments.
Understand the transfer and buyout provisions before year three. Selling your home with a leased system attached requires the buyer to qualify for and assume the contract, or you pay a buyout. Buyout prices are set at contract signing and can be significant in early years. Some calculate them as net present value of remaining payments, which is not a small number.
State Incentives Are Now the Real Sizing Variable
With the federal credit gone for buyers, state-level programs are doing more work in the sizing math than ever before. Active SREC and production-based incentive programs currently exist in DC, Delaware, Maryland, Ohio, Pennsylvania, Virginia, Illinois, Massachusetts, Minnesota, and New Jersey. These programs pay you per kilowatt-hour generated or per unit of renewable energy certificate created, and that payment accrues to the system owner, which in a lease or PPA is the installer, not you.
This is worth negotiating. If you’re in New Jersey or Massachusetts, where SREC programs are robust, the installer is capturing meaningful additional revenue from a system on your roof. That value should be reflected in a lower PPA rate or lease payment. If an installer in a strong SREC state is quoting you the same rate as one in a state with no production incentives, ask why. The answer should be a good one.
For homeowners in states without SREC programs, sizing and contract terms become even more conservative. There’s no production-side upside to share. The value equation is purely: does this PPA rate plus battery storage beat what I’d otherwise pay the utility, over time, with reasonable assumptions about rate escalation?
Battery attachment rates for new residential systems hit 40% nationally in Q1 2026, up from 35% in 2025. That’s not coincidence. It reflects both the spread of net billing structures and the reality that a solar-only PPA in a low-export-value market leaves money on the table. If your installer quotes solar without even mentioning storage, that’s a gap worth closing before you sign.
What “Surging” Actually Means for Your Negotiating Position
The 205% surge in installations in the second half of 2025, as homeowners raced to beat the Section 25D deadline, left installers flush with completed projects and now facing a slower 2026 market. Per PV Tech’s March 2026 analysis, the industry is in adjustment mode, managing a post-surge demand gap while retooling around third-party products.
Slower markets favor buyers. Installers who were turning away customers in late 2025 are now competing on price and terms. That’s leverage. Use it to negotiate a lower PPA escalator, a stronger production guarantee, or a more favorable early buyout schedule, not necessarily a lower starting rate, which is what they’ll offer first because it’s the number that shows up in marketing.
The shift in 2026 is fundamental: leases and PPAs are no longer the consolation prize for homeowners who couldn’t qualify for financing. They’re the primary vehicle now, and they deserve primary-vehicle scrutiny. Read the contract as carefully as you’d read a 25-year mortgage, because that’s roughly what it is.
Sources
- US Residential Solar Installations Set to Stall for Years (June 15, 2026)
- US Residential Solar Enters Post-Incentive Era After ITC Expiry Surge (March 2, 2026)
- Solar Incentives: How to Save Money on Solar Panels in 2026 (April 15, 2026)
- Solar and Storage to Lead Record-Breaking 86 GW of New U.S. Capacity in 2026 (February 25, 2026)
- Missed the 30% Tax Credit? How to Make Solar Work for You in 2026 (April 1, 2026)
Recommended Resources
Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.
- Renogy 200W Solar Starter Kit + 30A Charge Controller (~$169), Complete beginner solar kit, 200W monocrystalline panel, charge controller, and mounting hardware included.
- EF EcoFlow DELTA 2 Portable Power Station (1024Wh) (~$599), 1024Wh LFP battery with 1800W output, top-rated solar generator for home backup power. Charges in under 2 hours.
