A Power Purchase Agreement sounds more complicated than it is. Here’s the plain version: a solar company installs panels on your roof for free. You agree to buy the electricity those panels produce for a set rate per kilowatt-hour — typically lower than your utility rate — for 20–25 years. The company owns the panels. You buy the power.
That’s it. No equipment purchase, no loan, no upfront cost. Just a long-term electricity rate contract with a solar company instead of your utility.
I didn’t go this route — I bought my system outright — but I’ve talked to enough homeowners who did to understand when a PPA makes sense and when it doesn’t.
How the Economics Work
PPAs are priced as a rate per kWh, typically $0.08–$0.15/kWh at signing, with an annual escalator of 2–3% built in. If your current utility rate is $0.14/kWh and the PPA starts at $0.10/kWh with a 2.5% annual escalator, you save money in the early years. As the escalator compounds and utility rates change, the savings spread narrows or widens depending on how your local utility prices move.
The annual escalator is the number most people don’t pay attention to. A PPA starting at $0.10/kWh with a 2.9% escalator reaches $0.20/kWh by year 25. If your utility rate is $0.18/kWh at that point, you’ve flipped from saving money to paying more than the grid. Whether that happens depends entirely on future utility rate movements — which nobody can predict precisely.
The savings over 20–25 years on a well-structured PPA can be real but are smaller than ownership. The lease vs. buy analysis I ran shows ownership generating roughly $15,000–$25,000 more in lifetime value than a lease or PPA for most homeowners who stay in their home. The PPA’s appeal is the zero upfront cost, not the long-term financial outcome.
What You Give Up in a PPA
The 30% federal tax credit. Because you don’t own the system, you don’t claim the ITC. The solar company does — and prices the PPA partly based on capturing that credit themselves. You’re indirectly funding their tax credit through your rate.
Home resale flexibility. A PPA is a 20–25 year contract attached to your property. When you sell, the new buyer must either assume the PPA contract or you must buy out the remaining term. Buyout costs vary widely — some contracts have fixed buyout schedules, others price it at the present value of remaining payments. Either way, it’s a transaction complication. Solar’s effect on home value is strongest for owned systems — a PPA may add some appeal but less than ownership.
Control over the system. Maintenance, monitoring, and decisions about the equipment belong to the company that owns it. If you want to add a battery later, expand the system, or change inverters, you negotiate with the PPA provider rather than making those decisions yourself.
Who a PPA Actually Makes Sense For
Homeowners who can’t qualify for a solar loan or don’t have cash and for whom the alternative is no solar at all. A PPA produces savings with zero upfront investment — that’s genuinely valuable for households with limited capital.
Homeowners who plan to stay in the home long-term and are confident the buyer will assume the agreement (or they’ll buy it out at a manageable price). The longer you’re in the home, the more cumulative savings accumulate.
Homeowners in states where PPAs are available. Not all states allow third-party ownership solar PPAs — about 25 states permit them. Check your state’s regulatory framework before assuming a PPA is an option.
Homeowners who want no maintenance responsibility. The PPA company maintains the system. If a panel fails or the inverter needs replacement, that’s their problem, not yours.
For homeowners who can access capital — cash, HELOC, or a clean solar loan — ownership almost always wins financially. PPAs are the right tool for specific situations, not a universally good deal.
— Allen
