Is solar worth it? Complete ROI analysis

Break-even math with the assumptions written out, utility rates, net metering, financing and ownership.

Solar is "worth it" when the lifetime value of electricity your system produces, plus any resilience, environmental, or property value benefits you care about, exceeds the after-incentive cost at a discount rate you find acceptable. That sentence is deliberately boring. Flashy "3-year payback" claims from solar sales teams usually hide an aggressive utility rate escalation assumption, ignore financing costs, or conflate a lease payment with ownership economics. The antidote is understanding the real inputs and running the math yourself.

Most US homes with reasonable sun exposure, moderate-to-high electricity rates, and decent export rules still land in a 7- to 12-year simple payback band in 2026. That range widened compared to pre-2026 numbers because the residential Investment Tax Credit for homeowner-owned systems closed after 2025, removing 30 % of the upfront cost reduction that made payback projections shorter. Homes in low-rate, poor-export markets need a harder look at the numbers, a battery strategy, or a TPO structure to make solar pencil out.

Inputs that matter

Every ROI calculation rests on a set of assumptions. The honest ones are listed; the dishonest ones are hidden. Here are the variables that drive your payback period and lifetime return, roughly in order of impact: all-in system cost after incentives, your current and projected utility rate, the export credit or net metering rules from your utility, annual system degradation rate, financing terms and true APR, inverter replacement cost, and how long you plan to stay in the home.

Each of these variables has a "sales-friendly" version and a "realistic" version. A sales rep might assume 4 % annual utility rate escalation when your utility has averaged 2.5 % over the past decade. They might quote a 25-year degradation rate of 0.2 % per year when the manufacturer's warranty specifies 0.4 %. They might omit the dealer fee baked into the loan APR. None of these are outright lies, but they collectively paint a picture that is rosier than the likely outcome.

Payback ranges

Simple payback is the most intuitive metric: net system cost divided by first-year bill savings. It tells you how many years until the system "pays for itself." For a typical 7.2 kW system at $2.70/W ($19,440) with annual savings of $1,800, simple payback is about 10.8 years. If your rate is higher, payback shortens. If your export credits are poor, payback lengthens. Simple payback ignores the time value of money, utility rate changes, and degradation, but it's a useful first filter.

A more rigorous analysis is a year-by-year cash flow model. In year one, the system produces X kWh, you self-consume Y % and export the rest at Z rate, and your bill savings are a specific dollar amount. In year two, the system degrades by 0.4 %, your utility rate may increase by 2 % to 3 %, and if you're financing, you make another loan payment. The model runs forward for 25 years, and the year in which cumulative savings exceed cumulative costs is your discounted payback. If you have a solar loan, include the loan payment, not just the interest, as a cost in each year.

Payback sensitivity

• Utility rate: each $0.01/kWh increase in your rate shortens payback by roughly 3 to 6 months.
• Export credit: moving from full retail NEM to a 75 % export rate extends payback by 1 to 2 years on an average system.
• System cost: every $1,000 reduction in net cost shortens payback by about 6 months.
• Financing cost: a 7 % APR solar loan versus a 4 % HELOC can add 2 to 3 years to the effective payback.

Own vs TPO

Ownership, whether with cash or a loan, gives you all the long-term savings but requires the full upfront investment. Before 2026, the 30 % ITC made ownership dramatically more attractive by reducing the net cost. Without that credit for homeowner-owned systems, the upfront cost is higher, and loan-financed ownership is burdened by interest and dealer fees that can add 20 % to 30 % to the total cost of the loan. For homeowners who can pay cash or use a low-rate home equity line of credit, ownership still produces the best 25-year return.

Third-party ownership, leases and power purchase agreements, lets you go solar with little or no upfront cost. The TPO provider owns the system, claims the commercial ITC (still available), and passes the savings through as a lower monthly energy cost. The trade-off is that you don't own the long-term savings; instead, you pay a fixed or escalating monthly rate to the TPO provider. Read the year-10 and year-20 cost projections, not just the month-one comparison. An escalation clause of 2.9 % per year compounds to a 33 % price increase over 10 years.

TPO red flags

• Annual escalation rates above 2.9 %, compare to your utility's historical rate increase.
• Buyout clauses that price the system at fair market value determined by the provider, not an independent appraiser.
• Transfer fees if you sell your home before the lease term ends.
• Automatic renewal clauses that extend the agreement unless you provide written notice months in advance.

Hidden variables

Several factors affect ROI that rarely appear in a sales presentation. Property tax treatment varies by state, some states exempt solar equipment from property tax assessments, others don't, meaning your system could increase your annual tax bill. Homeowner's insurance may require a rider or increased coverage to protect the array, adding $50 to $200 per year. If your utility is actively restructuring its net metering program, your export credits could change mid-ownership, altering the payback projection you signed up for.

The home-sale scenario is another hidden variable. Owned systems generally add value to a home listing, studies suggest a premium of $10,000 to $20,000 for an average-sized system, but the premium varies by market and buyer awareness. Leased or PPA systems require the buyer to either assume the contract or you to buy out the remainder, which can complicate and slow a sale. If you might sell within 5 to 7 years, factor the resale implications into your decision and consider whether ownership or TPO creates a cleaner transaction for a future buyer.

Verdict framework

Solar is worth pursuing in 2026 if three conditions are met. First, your electricity rate is above roughly $0.12/kWh and your usage is at least moderate, below that threshold, the savings are too small to justify the investment regardless of system cost. Second, your export or net metering rules provide at least 50 % to 75 % of retail value for surplus energy, below that, you need a battery or load-shifting strategy to capture value. Third, you plan to stay in the home for at least 7 to 10 years or are confident the system adds resale value in your market.

If all three conditions are met, get three itemized bids, compute $/W yourself, model the cash flow year by year with conservative assumptions, and make the decision based on numbers rather than promises. If one or more conditions are not met, solar may still work, but the analysis requires more nuance. A TPO structure, a battery, or waiting for a better rate environment may be the smarter play. There is no shame in concluding that the math doesn't work today and revisiting in two years.

Next steps

Start by gathering your last 12 months of utility bills and calculating your total annual kWh consumption and average rate. Then request three quotes from different installers, enough to see the local price band without drowning in sales calls. For each quote, compute the price per watt, verify the production estimate against a third-party tool like PVWatts, and build a simple year-by-year cash flow model that includes degradation, your current rate, a conservative rate escalation assumption, and any financing costs.

Bring your utility's actual tariff PDF to the sales conversation and ask the installer to recompute payback using that document rather than their default assumptions. A good installer will welcome the exercise because it builds trust. A bad one will deflect because their numbers only work with optimistic inputs. That response tells you everything you need to know. Cross-reference with 2026 pricing and the pricing breakdown for cost context.

Common questions