$27,000 Solar System With No Federal Tax Credit: Payback at 2%, 4%, and 6% Rate Escalation Is 12, 11, or 10 Years

Your installer just handed you a quote for $27,000 and a line that says "estimated savings: $60,000 over 25 years." The 30% federal tax credit that used to knock $8,100 off that price isn't on the quote, because for cash and loan buyers it's gone. So what does the payback math actually look like now?

Short version: it still works in many places, but the answer depends on your utility rate, your roof, and how you pay. Below is the math, worked out line by line, so you can swap in your own numbers.

What Changed With the Federal ITC (and What Didn't)

The federal Investment Tax Credit (ITC) was a dollar-for-dollar reduction in your federal income tax equal to 30% of system cost. For homeowners who buy their system (cash or loan), the residential credit ended for systems placed in service after 2025. Some commercial-side credits used by leasing and PPA companies (a PPA is a power purchase agreement, where you pay per kWh for power from panels someone else owns) have a longer runway, but with deadlines and tax-ownership risk. Check the current rules for your situation, and confirm anything tax-related with a tax professional. For the full timeline, see our guide to IRA electrification credits in 2026.

Here is the useful reframe from PV Magazine USA's piece, "No ITC? No problem. Solar's value proposition was never about the subsidy." The argument is that solar is a low-cost source of power that grows faster once it sheds regulatory delays and the tax-structuring risk of third-party deals. For a homeowner, translate that to: the panels' economics are driven by the electricity you stop buying. The subsidy was a discount on the purchase. The savings come from your utility bill.

That means your utility rate matters more than ever.

Step 1: Your Rate Sets the Ceiling

Based on Elovane's analysis of 10,850 data points across seven sources, the biggest single driver of payback is the price per kWh you avoid buying. Our eia electricity prices dataset (state-level residential prices) shows a wide spread. Roughly speaking, residential rates run from the low $0.10s per kWh in the cheapest states to above $0.30 in the most expensive. The national average sits in the high teens.

Our nrel solar irradiance and nrel county solar datasets (built on NREL's PVWatts model) add the second half of the equation: how many kWh each kilowatt of panels produces. A well-oriented system typically produces somewhere between about 1,250 kWh per kW per year in cloudier northern locations and 1,700 or more in the desert Southwest.

Put those together and the same $27,000 system produces very different dollar outcomes:

Location type	Production (kWh per kW per year)	Rate ($/kWh)	Year-1 savings on 8 kW
Low-rate, sunny	1,600	$0.12	about $1,536
Mid-rate, average sun	1,450	$0.18	about $2,088
High-rate, average sun	1,450	$0.30	about $3,480
High-rate, cloudy	1,250	$0.30	about $3,000

A rate difference of $0.18 vs. $0.12 matters more than a sun difference of 1,450 vs. 1,600 kWh. If someone tells you solar is a "no-brainer" without asking for your utility rate, they haven't done the math. For a deeper look at how rate structure changes this, see why your utility rate structure decides between a 7-year and 19-year payback.

Step 2: The Worked Example, With No Tax Credit

Let's use a mid-range house:

• System: 8 kW, $27,000 installed (about $3.38 per watt)
• Production: 8 kW × 1,450 kWh/kW = 11,600 kWh in year 1
• Rate: $0.18/kWh, so year-1 savings = $2,088
• Degradation: panels lose about 0.5% of output per year
• Assumption: the system offsets your usage at the retail rate (this is generous; see the net metering caveat below)

The unknown is how fast your utility raises rates. Nobody knows, so we run three scenarios. Each year's savings equal the previous year's times (1 + escalation) × 0.995.

Rate escalation	Year-1 savings	Year-10 savings	Payback (no ITC)	Payback (if you had 30% ITC, for comparison)
2% per year	$2,088	about $2,390	about 11.9 years	about 8.6 years
4% per year	$2,088	about $2,850	about 10.9 years	about 8.0 years
6% per year	$2,088	about $3,390	about 10.0 years	about 7.6 years

So the loss of the credit adds roughly 2.4 to 3.3 years to payback in this example. That's real, but it is not a collapse. The swing between the 2% and 6% escalation scenarios is about 1.9 years, which is almost as large as the effect of losing the credit.

Which escalation number should you use? Historical U.S. residential price growth has run around 2% to 3% a year over long periods, with sharper increases in some regions recently. Use 2% as your conservative case and 4% as your planning case, and treat 6% as an upside scenario, not a promise. We walk through this in more detail in solar payback at 2% vs. 6% rate escalation.

This is the kind of analysis Elovane runs for you, using your ZIP code's rates and sun data, so you don't have to build the spreadsheet yourself.

Step 3: Your Roof Can Move the Result More Than the Tax Credit Did

Installer quotes often assume ideal conditions. Real roofs don't cooperate.

Rough rules of thumb from NREL's PVWatts modeling approach:

• South-facing, 20 to 30 degree tilt: the baseline (100%)
• East or west-facing: roughly 10% to 20% less annual production
• North-facing: often 25% to 35% less
• Shading: 10% shade on the array can cost close to 10% of output, sometimes more if it hits a whole string of panels

Take our worked example and apply a 15% production haircut (a west-facing roof with some afternoon tree shade). Year-1 savings fall from $2,088 to about $1,775. At 4% escalation, payback moves from about 10.9 years to roughly 13 years. That's a two-year swing from a factor that's completely absent from most one-page quotes.

Also consider the panels' expected life. Panels usually carry 25-year performance warranties, but inverters often need replacement around year 10 to 15, at perhaps $2,000 to $4,000. If your payback is 13 years and your inverter dies in year 12, that changes the story. Ask for the inverter warranty term in writing.

Step 4: Cash vs. Loan vs. Lease or PPA

This is where a no-ITC world gets interesting. Without the credit, the financing choice matters even more, because the loan interest is no longer being offset by a big up-front tax reduction.

Using the same 8 kW system and the 4% escalation scenario (year-1 savings of $2,088, growing to roughly $81,000 in cumulative savings over 25 years, undiscounted):

Option	Cost structure	25-year cumulative savings	Total paid	Net over 25 years
Cash	$27,000 up front	about $81,100	$27,000	about $54,100
Loan (15 years at 7.5%)	about $250/month, about $3,004/year	about $81,100	about $45,050	about $36,050
Lease or PPA	varies, typically a fixed monthly payment or per-kWh rate with an annual escalator	you keep only a share of the savings	varies	usually the smallest net gain

Key numbers to notice:

• The loan's first-year payment ($3,004) is higher than the first-year savings ($2,088). You'd be about $916 negative in cash flow in year 1.
• The loan's total interest is about $18,050 on a $27,000 principal.
• The cash-vs-loan gap is about $18,000 over 25 years, in this example.

That gap shrinks a lot with a lower loan rate, and it grows with a higher one. Every extra point of interest is worth thousands of dollars on a loan this size. Compare offers by total interest paid, not monthly payment. We compare all three in detail in solar loan vs. lease vs. cash in 2026.

A note on leases and PPAs: in the PV Magazine piece, one theme is that third-party ownership carries tax-structuring risk. For the homeowner, the practical risks are different: escalators in the contract (a 2.9% annual escalator on your payment can outrun the savings if your utility's rates rise slower), transfer clauses when you sell the house, and installer solvency. Read the escalator line first.

Speaking of tools, PV Magazine USA also covered Aurora Solar's platform update, which lets installers quote solar alongside HVAC and EV charging and adds new financing tools. That's useful for a homeowner because it means bundled quotes will become more common. It also means more variables in a single number. If a quote bundles solar with a heat pump and a charger, ask for each line item priced separately so you can judge each one on its own payback. Our guide on solar-first vs. heat-pump-first sequencing shows why the order changes the math.

Step 5: State Incentives Can Partially Fill the Gap

The federal credit is gone for cash and loan buyers, but state and local incentives are a separate stack. Our dsire incentive programs dataset (171 program records) shows that what exists varies enormously: some states offer sales-tax exemptions, property-tax exemptions (your home's assessed value doesn't rise from the solar), state income tax credits, cash rebates, or SRECs.

An SREC (solar renewable energy certificate) is a tradable credit you earn per megawatt-hour your system produces, which you can sell to utilities that must meet state clean energy targets. In strong SREC markets, income can be meaningful. In weak or nonexistent ones, it's zero.

Quick sensitivity on our worked example: if a state program gives you $2,000 as a one-time rebate, the 4% escalation payback improves from about 10.9 to about 10.0 years. If SREC income adds $400 per year, payback improves to about 9.3 years. Those numbers only mean something if you verify the program is currently open, funded, and applicable to your utility. Programs run out of money and change terms, so confirm with the state agency before you plan on them. For examples of how strongly this varies, see the Massachusetts SREC stack vs. Texas and Florida comparison.

Step 6: Net Metering Quietly Decides Whether the $2,088 Is Real

Our worked example assumed you use all your solar power at the retail rate. In practice, panels produce most at midday, and you may be at work. The extra power gets exported to the grid, and what the utility pays you for it depends on your state's net metering policy (the rule for how much credit you get for exports).

If exports are credited at full retail, our math holds. If they're credited at a lower "avoided cost" rate, say $0.05 to $0.08 per kWh, and half your production is exported, your effective savings can drop by 15% to 25%. That would push our 10.9-year payback toward 13 to 14 years. Our state-by-state net metering guide shows where the rules stand.

Step 7: Does a Battery Fix It?

This is where the news cycle gets relevant. GridStor's 400 MWh White Tank battery project in Arizona, reported by PV Magazine USA, secured financing with tolling arranged through the state utility. In plain language: a utility agreed to pay a fixed fee for access to the battery's capacity. That's a signal that batteries have real grid value, and in California, Canary Media's coverage of the state's latest virtual power plant (VPP) asks the right question about home batteries: will the payments actually reach the homeowner? A VPP pays you for letting the utility or an aggregator draw on your battery during peak events.

For your household, the battery math is simpler. Take a $10,500 battery with about 12 kWh of usable capacity, cycling about 300 days a year at roughly 90% round-trip efficiency:

Time-of-use (TOU) spread (peak price minus off-peak price)	Annual savings (approx.)	Simple payback
$0.38/kWh	about $1,230	about 8.5 years
$0.30/kWh	about $970	about 10.8 years
$0.15/kWh	about $490	about 21.6 years

If your utility has a flat rate, or a small peak-to-off-peak gap, the battery's savings shrink toward nothing, and you're buying backup power rather than an investment. If a VPP program pays you extra, that may improve things, but treat any promised payment as unverified until it's in a contract you can read. See our TOU arbitrage guide for how to compute your own spread.

A Word on the Bigger Rate Picture

One more piece of context. PV Magazine USA also reported on Google's "Fair Share Plus" data center arrangement with Entergy in Arkansas, where advocates are questioning whether special rate contracts for big loads truly insulate residential customers from cost increases. We can't say how that particular case will resolve. But the general point matters for your solar math: your rate escalation assumption is a bet on what your utility does with new demand, new infrastructure, and rate cases. In regions where large loads are driving grid buildouts, a higher escalation scenario is more plausible. In regions with flat demand, it's less so. Look at your utility's recent rate case filings before picking your number.

Your Personal Checklist Before You Sign

Run these five inputs for your own house:

1. Your real rate per kWh, from your last 12 bills (all-in, including delivery charges), plus whether you're on flat, TOU, or demand-charge pricing.
2. Your roof's production estimate, adjusted for orientation and shading, not the best-case number.
3. Your export credit rate under your state's net metering rules.
4. Every incentive you can verify is currently open, and the ones that aren't.
5. Financing total cost, meaning total interest and escalators, not the monthly payment.

Then run all three escalation scenarios (2%, 4%, 6%). If the deal only works at 6%, that's a sign it's fragile. If it pays back in under 12 years even at 2% and after a 15% production haircut, it's robust.

Solar's value was always the electricity you stop buying, and that's a number specific to your address. You can run that comparison for your own roof, rate, incentives, and financing at Elovane before you put a signature on anything.

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

• No ITC? No problem. Solar’s value proposition was never about the subsidy — PV Magazine USA
• Google’s “Fair Share Plus” data center deal with Entergy sparks Arkansas ratepayer concerns — PV Magazine USA
• Aurora Solar updates platform to include home electrification and new financing tools — PV Magazine USA
• GridStor wins financing for 400 MWh BESS in Arizona, tolling secured with state utility — PV Magazine USA
• Should we get excited about California’s latest virtual power plant? — Canary Media