What is TPO solar?
Third-party ownership: a company owns the equipment on your roof, and you buy an arrangement rather than hardware. Most people encountering the term in 2026 are hearing it because their installer stopped offering anything else.
Why you are suddenly being offered this
The 30% federal credit for homeowners who buy expired after December 31, 2025. The equivalent commercial credit (§48E) did not. A company that owns your system can still claim it — so third-party ownership became the only path by which federal money reaches a residential roof. Installers followed the money, and third-party ownership went from a minority of sales to the clear majority within a year.
The two forms it takes
TPO is an umbrella. Underneath it are two contracts: a lease (fixed monthly payment for use of the equipment) and a PPA (a per-kWh price for what the system produces). The distinction decides who absorbs a bad production year — covered in detail in lease vs. PPA.
What you give up, what you avoid
You give up
- Ownership of the asset, and any resale value attached to it.
- The larger share of long-run savings. The financier's margin is real and it comes out of your side of the ledger.
- Flexibility. A 25-year contract attached to your house constrains a future sale, a roof replacement, and your own options.
You avoid
- The upfront cost — commonly $20,000–30,000.
- Maintenance, insurance and the inverter replacement that lands somewhere around year 13.
- Equipment risk. If it breaks, it is the owner's problem, not yours.
How much of the credit actually reaches you?
This is the question no provider answers directly. The financier claims 30% and prices your contract competitively — but how much of that 30% lands in your payment versus their cost of capital and margin is not disclosed.
Our calculator assumes roughly half is passed through, and labels it as an estimate rather than a fact. The practical implication: do not assume a TPO offer is automatically 30% better than a purchase. Compare the actual numbers.
The risk nobody mentions: will the provider still exist?
A TPO contract runs 20–25 years and depends on the counterparty surviving it. The residential solar market is contracting sharply — installation volumes are down substantially against 2025, a major national installer withdrew from a third of its state markets and cut a fifth of its staff, and at least one multi-state installer has filed for bankruptcy protection.
Ask who actually owns the contract, whether it will be sold on, and who services the system if the installer disappears. In this market that is not a paranoid question.
Common questions
What does TPO mean in solar?
Third-party ownership. A financing company owns the equipment installed on your roof; you sign a lease or a power purchase agreement to use it or buy its output. You are not the owner and do not claim the tax credit.
Why did TPO suddenly take over the market?
Because the federal residential tax credit expired at the end of 2025. The commercial credit did not. When a company owns the system it can still claim 30% under §48E, so third-party ownership became the only route by which a federal credit reaches a residential rooftop.
Is TPO worse than owning?
It is different, not automatically worse — and the change in 2026 shifted the balance. Owners keep all the savings and any resale benefit but carry the upfront cost, the maintenance and the inverter replacement, now with no federal credit. TPO customers pay nothing upfront and carry no maintenance, but keep only the margin between their payment and the utility bill they avoid.
Do I own the panels at the end?
Not automatically. Most contracts offer renewal, a buyout at fair market value, or removal. Prepaid leases sometimes include transfer of ownership at the end of the term — if that matters to you, get it in the contract rather than assuming it.
Next: compare a TPO offer against buying outright, or read about the December 2027 deadline that constrains these offers.