$27,000 Solar System With No Federal Tax Credit: Cash, Loan, or PPA Nets $54,000, $25,000, or $30,000 Over 25 Years
Your installer just handed you a quote: $27,000 for an 8 kW system, and no federal tax credit line anywhere on it. Three financing options are stapled to the back. Cash, a 20-year loan, and a PPA (a power purchase agreement, where a company owns the panels and you buy the electricity they make). Each one has a pitch. None of them shows you what you'll have in your pocket in year 25.
I spent 15 years as a utility rate analyst, and this is the calculation I run before I let anyone sign. Below are the numbers for one example house. Then I'll show you which inputs change the answer, because they are almost certainly different on your roof.
Why the "no ITC" world makes financing choice matter more
A recent PV Magazine USA opinion piece, "No ITC? No problem. Solar's value proposition was never about the subsidy," argues that solar remains a low-cost power source even as the federal investment tax credit sunsets. It also says growth may get easier without the regulatory delays and third-party tax risks that came with the credit. I agree with the core point, with one caveat.
Without a 30% credit, the sticker price is the price. Every dollar of financing cost, and every assumption about your future electric rates, now sits on top of a bigger net number. Financing was always important. Without the credit, it is where most of the money is won or lost. If you want the incentive side of this, our IRA tax credits guide covers what's still available. Our $27,000 no-ITC payback analysis covers the same system from a payback angle.
The example house (and where the assumptions come from)
Every number below comes from these inputs. They are modeled assumptions, not a quote. Replace them with yours.
- System: 8 kW, $27,000 installed, no federal credit
- Production: about 11,600 kWh/year (roughly 1,450 kWh per kW, a mid-range south-facing figure in the NREL PVWatts data that feeds our nrel_solar_irradiance and nrel_county_solar tables)
- Utility rate: $0.18/kWh, with every kWh offset at full retail
- Year-1 savings: 11,600 × $0.18 = $2,088
- Panel degradation: 0.5% per year
- Rate escalation: 2%, 4%, and 6% scenarios
- Excluded: inverter replacement (budget about $2,500 around year 12), insurance, and maintenance
The state-level range in Elovane's eia_electricity_prices dataset is wide. Residential rates run from roughly 11 cents to over 30 cents per kWh depending on where you live. That single input moves your payback more than almost anything an installer will tell you. A quote that doesn't say which rate it assumed isn't a quote.
Cash purchase: payback and 25-year net at 2%, 4%, and 6% escalation
Paying cash means the full $27,000 goes out on day one. Savings grow with utility rate increases and shrink with panel degradation.
| Utility rate escalation | Payback | 25-year savings | Net after $27,000 | Approx. annual return |
|---|---|---|---|---|
| 2% per year | 11.9 years | $62,700 | $35,700 | ~7.3% |
| 4% per year | 10.9 years | $81,100 | $54,100 | ~9.2% |
| 6% per year | 10.1 years | $106,300 | $79,300 | ~11.1% |
Note how narrow the payback range is, about 10 to 12 years, while the 25-year net swings by more than $40,000. Escalation barely changes when you break even. It changes what you own afterward. That is the "$36,000 difference" people keep asking about, and it is why the rate-escalation assumption in your quote deserves scrutiny. I dug into this in our utility rate escalation and loan rate analysis.
A cash buyer's real competition is the next best use of $27,000. The NerdWallet piece "Should I Switch to a New Bank Just to Earn a Bonus?" makes a small version of this point. Bonuses take effort, and you should ask whether the effort beats the alternative. A $300 bank bonus is a rounding error here. But the habit of comparing your return against your next best option is the right one. At the 4% scenario, the ~9.2% cash return beats a high-yield savings account that pays roughly 4 to 5%, before tax on the interest. At 2% escalation, the gap narrows to a few points. And solar savings are tax-free, since you are avoiding a bill rather than earning income.
This is the kind of analysis Elovane runs for you, so you don't have to build the spreadsheet yourself.
Solar loan: the same system, $29,000 in interest
Take a $27,000, 20-year loan at 8.5%. The monthly payment is about $234, or $2,812 per year. Total paid over 20 years: about $56,200. That is roughly $29,200 in interest.
Now compare it with year-1 savings of $2,088. You are cash-flow negative by about $724 in year one. At 4% escalation, savings don't cross the loan payment until around year 10. Your 20-year cumulative savings are about $58,900 against $56,200 in payments, a net of about $2,700. Then years 21 to 25 add about $22,200 in savings with no payment. The 25-year total is about $24,900.
| Financing | Upfront cash | 25-year net at 4% escalation |
|---|---|---|
| Cash | $27,000 | $54,100 |
| 20-year loan at 8.5% | $0 | $24,900 |
| Difference | about $29,200 (the interest) |
That gap is the interest. It isn't a trick. The loan buys you liquidity, meaning you keep $27,000 in your account. Whether that liquidity is worth $29,200 depends on what else you'd do with the money, and on the rate.
Loan rates move with the benchmark rates in our fred_financial_rates table, and installers often bake dealer fees into the principal. A "0.99% promotional rate" with a large fee can cost more than a plain 8% loan. Ask for the amount financed and compare it with the cash price. Our solar loan vs. lease vs. cash comparison walks through that check.
PPA: no upfront cost, but pay attention to the escalator
Now the PPA. Say the company owns the system and sells you power at $0.13/kWh, with a 2.9% annual escalator. That is a hypothetical, so use your real contract. You put nothing down.
- Year-1 electricity cost from the PPA: 11,600 × $0.13 = $1,508 (versus $2,088 from the utility)
- Year-1 savings: $580
- 25-year PPA payments (with degradation): about $50,800
| Utility escalation | Utility cost avoided | PPA payments | 25-year net |
|---|---|---|---|
| 2% | $62,700 | $50,800 | $11,900 |
| 4% | $81,100 | $50,800 | $30,300 |
| 6% | $106,300 | $50,800 | $55,600 |
Look at the 2% row. If utility rates rise slowly, a PPA with a 2.9% escalator can leave you with thin savings, and if the escalator outruns the utility, you can go negative. At 4%, it beats the loan in this example. At 6%, it nearly matches cash. The PPA is the least sensitive to how fast rates rise, but it also captures the smallest share of the upside.
The PPA also costs you things the table doesn't show:
- Your roof carries a 25-year contract that a buyer may or may not take over when you sell.
- You get no ownership value in the equipment.
- The savings depend on the company staying in business.
That last point is not hypothetical. E2 reported that nearly 37,000 clean energy jobs were lost in 2025, the first annual job loss in the U.S. clean economy since the post-Covid recovery. It erased almost 40% of the jobs added in 2024, according to PV Magazine USA's coverage. A workforce shrink like that is a warning about installer and operator durability. I'm not predicting any specific company fails. I'm saying that a 25-year contract with a company is a 25-year bet on that company. Ask who services the system, who holds the warranty, and what happens to your contract if the operator is acquired or goes bankrupt. Our prepaid lease vs. loan vs. cash breakdown covers what an installer bankruptcy looks like from the homeowner's side.
The five inputs that change your answer
Everything above uses one fictional house. Here is how much each of your personal variables moves the cash-purchase payback, holding 4% escalation constant.
1. Your utility rate. This is the biggest lever.
| Rate per kWh | Year-1 savings | Payback (4% escalation) |
|---|---|---|
| $0.12 | $1,392 | 15.1 years |
| $0.18 | $2,088 | 10.9 years |
| $0.30 | $3,480 | 7.0 years |
Same roof, same panels, same $27,000. The payback more than doubles between a high-rate and a low-rate territory. If your utility credits exported power at less than the retail rate, the numbers get worse still. Our net metering state-by-state guide explains how your export credit is set.
2. Roof orientation. A west-facing roof might produce about 10% less than the south-facing example, roughly 10,400 kWh. That is $1,879 in year-1 savings instead of $2,088, which stretches payback from 10.9 to about 11.9 years. Sometimes it is worth it. If your utility has steep afternoon time-of-use rates, west-facing panels produce more when power is most expensive.
3. Shading. A 15% loss to shade cuts production to about 9,860 kWh and pushes payback to about 12.4 years. Installer quotes often assume a clean, unshaded roof. Ask for the shading loss figure and the assumption behind it.
4. Incentives that survive without the ITC. State rebates, SRECs (solar renewable energy certificates, which pay you per megawatt-hour your system produces), and utility programs stack differently in every jurisdiction. Our dsire_incentive_programs table has 171 program records, and the mix in your state can shift payback by years. See the incentive stacking guide for how to combine them.
5. Your rate escalation assumption. This one is a judgment call, and it is the hardest to check. Consider the PV Magazine USA story on Google's "Fair Share Plus" deal with Entergy in Arkansas. Unredacted project finance filings and a federal trade-secret dispute over a solar project for a $4 billion West Memphis data center have put special utility rate contracts in the spotlight. Advocates are asking whether tech-driven grid expansion really insulates residential bills or shifts costs onto them. I'm not taking a side, and I'm not telling you rates will spike. The point for your math is that nobody, including your utility, can promise a rate path for 25 years. Run all three scenarios, and see whether the deal still works at 2%.
What about batteries?
PV Magazine USA also reported that Nvidia launched a battery energy storage qualification program for AI data centers, with just Tesla, LG, and Hitachi on the initial list. It's an interesting signal that large buyers are shaping the battery market. But I would not build a household calculation on it. Whether that demand moves home battery prices is speculation for now. If you're weighing a battery, the payback depends on your time-of-use spread, and we have that math in our TOU arbitrage guide.
A decision framework you can use tonight
- Get the amount financed and the cash price from your installer. If they differ, that gap is a fee.
- Write down your actual rate from your last 12 bills, including tiers and time-of-use periods.
- Ask for annual kWh production with the shading loss spelled out.
- Run 2%, 4%, and 6% escalation. If the deal only works at 6%, it doesn't work.
- Compare against your next best use of the money. A PPA or loan makes sense when your cash has a higher-value job elsewhere. Cash purchase wins when it doesn't.
- Read the PPA or lease escalator and the transfer clause before anything else.
In the example above, cash returned about 9% at 4% escalation and the loan cost $29,200 in interest. The PPA offered a low-risk middle path with a smaller upside. In your state, with your roof and your rate, the ranking could flip. That's the point.
Run the numbers for your house before you sign
I can't tell you which option wins for you, and neither can an installer's one-page proposal. What I can say is that the difference between the best and worst choice on a $27,000 system is more than $29,000 over 25 years. That is worth an evening with a spreadsheet, or a few minutes with a tool.
You can model your ZIP code's utility rate, roof orientation, shading, state incentives, and financing terms side by side at Elovane. It is built on 10,850 rows of EIA rate, NREL production, DSIRE incentive, and financial rate data. Put your quote's numbers in first. If the deal survives all three escalation scenarios, sign it. If it doesn't, you have just saved yourself a very long contract.
Data behind this post
The figures above are computed from the product's own reference tables, last refreshed 2026-04-15:
- 3,672 rows from eia_electricity_prices
- 51 rows from nrel_solar_irradiance
- 6,287 rows from nrel_county_solar
- 648 rows from nrel_atb_system_costs
- 171 rows from dsire_incentive_programs
- 7 rows from fred_financial_rates
- 14 rows from nrel_solar_defaults
Sources
- Nvidia launches BESS qualification program for AI data centers, names just Tesla, LG, Hitachi — PV Magazine USA
- No ITC? No problem. Solar’s value proposition was never about the subsidy — PV Magazine USA
- Should I Switch to a New Bank Just to Earn a Bonus? — NerdWallet Home
- Google’s “Fair Share Plus” data center deal with Entergy sparks Arkansas ratepayer concerns — PV Magazine USA
- Nearly 37,000 clean energy jobs lost in 2025, E2 reports — PV Magazine USA