Solar Panel Cost in Rockford, IL 2026: ~31.0-Year Payback
In Rockford, IL, an 8 kW system at $3.02/W produces about 1,249 kWh per kW and pays back in roughly 31.0 years at 13.39¢/kWh with the federal credit at $0.
· Source: EIA Electric Power Monthly Table 5.6.A (July 2026 data) · next EIA update ~Oct 23
On this page: CalculatorTableHow we calculatedSources
Jump to calculator ↓The slider reprices the calculator above instantly, and the URL keeps your scenario — share it as-is.
- Rockford production
- 1,249 kWh/kW/yr
- Illinois average
- 1,245 kWh/kW/yr
- Electricity rate
- 19.2¢/kWh
- 8 kW installed cost
- ~$24,160
- 2026 federal credit
- $0
- Payback (utility math)
- 31.0 years
Why this number
A kilowatt of panels in Rockford produces about 1,249 kWh a year, placing it 2 of 3 among the Illinois cities modeled here. The state spans Springfield at 1,296 down to Chicago at 1,235, a 4.9% span, and Rockford sits inside it at a payback of about 22.9 years.
An 8 kW system in Rockford, priced out
| Metric | Estimate for Rockford | Illinois statewide |
|---|---|---|
| Production, unshaded 20° south | 1,249 kWh per kW/yr | 1,245 kWh per kW/yr |
| 8 kW output after a 10% roof derate | ~8,993 kWh/yr | ~8,964 kWh/yr |
| Average residential rate | 19.2¢/kWh (EIA) | 19.2¢/kWh |
| Installed cost, 8 kW | ~$24,160 at $3.02/watt | ~$24,160 |
| 2026 federal credit | $0 | $0 |
| Export rule | Net billing — exports credited below retail | Net billing — exports credited below retail |
| Export credit modeled | 5.77¢/kWh | 5.77¢/kWh |
| Annual value of that output | ~$1,002 | ~$999 |
| Rough payback (your utility) | 31.0 years | 23.0 years (state-average model) |
| 25-year net position | $2,149 | — |
Only the first two rows differ. Everything financial — rate, tariff, price per watt — is inherited from Illinois without change, which is the point: a city page that quietly used a different electricity rate from its state page would be guessing, not measuring.
Doing nothing is not free either. Twenty-five years of the electricity an 8 kW Rockford array would produce, with rates rising at 2.5% a year, comes to roughly $59,025.
Solar aside, the EV vs. gas cost calculator runs Rockford’s 19.2¢/kWh rate against what a gas car costs to fill instead.
Run it with your own bill
Shared methodology · identical on every city page
- Production figures are unshaded, south-facing, 20° PVGIS values. A real roof — its own pitch, orientation, a tree or a chimney — typically produces 10–25% less; every payback here already carries a 10% real-roof derate.
- Paybacks include $150/yr of running costs and one $2,000 inverter replacement in year 14, which is why they run longer than paybacks quoted elsewhere.
- State export rules cover investor-owned, state-regulated utilities. Municipal utilities and rural electric cooperatives are exempt in most states and set their own terms.
- Installed cost is the state-level EnergySage market figure, not a city quote; a swing of 50¢/W moves payback by roughly a year and a half either way. Get three quotes before trusting any payback — including ours.
Rockford against the rest of Illinois
Across the 3 Illinois cities with their own modeled figures, production spans 4.9% — Chicago at 1,235 kWh per kW to Springfield at 1,296. Every column except production is identical down this table: same 19.2¢/kWh retail rate, same export regime, same $3.02/W installed cost. The payback differences are caused by weather and nothing else.
| Location | kWh per kW per year | 8 kW output | Annual value | Payback |
|---|---|---|---|---|
| Springfield | 1,296 | 9,331 kWh | $1,040 | 22.2 yrs |
| Rockford (this page) | 1,249 | 8,993 kWh | $1,002 | 22.9 yrs |
| Chicago | 1,235 | 8,892 kWh | $991 | 23.1 yrs |
| Illinois state average | 1,245 | 8,964 kWh | $999 | 23.0 yrs |
Against the state figure, Rockford runs 0.3% above Illinois’s 1,245 kWh per kW — a payback 8.0 years longer than the statewide 23.0-year estimate on the same hardware at the same price.
What sets Rockford apart
Marginally ahead of Chicago, slightly further from the lake.
Your utility, officially
Illinois’s average residential rate is 19.2¢/kWh, but the bill in Rockford comes from Commonwealth Edison Co at 13.39¢ — 30% below the state figure. These are the residential figures Rockford’s utility reported to the U.S. Energy Information Administration on Form EIA-861 for 2024 — computed as revenue ÷ sales from the official file, not estimated:
| Utility | EIA ID | Residential avg price | Residential customers | Net-metering (residential, self-reported) |
|---|---|---|---|---|
| Commonwealth Edison Co | 4110 | 13.39¢/kWh | 3,727,675 | 65704 customers / 479.24 MW |
How exports are treated matters as much as the headline price: Commonwealth Edison Co is modeled here under the state’s net billing rules, and that treatment is baked into every payback figure on this page.
Rockford runs on the same wires company as Chicago. Commonwealth Edison’s territory covers most of northern Illinois, and its 3,727,675 residential customers stretch from the lakefront to the Wisconsin line — so the utility facts for a Rockford roof are ComEd facts: investor-owned, Exelon-held, a 2024 EIA-861 residential average of 13.39¢/kWh. But read that average carefully. In Illinois the wires and the electrons are sold separately: ComEd delivers power to every home in its territory, while the supply itself may come from ComEd’s default service, a competitive retail supplier, or an aggregation deal a municipality negotiated for its residents. ComEd’s EIA figure counts only revenue ComEd collected. What a Rockford household actually pays per kilowatt-hour — the number that decides solar’s value — is delivery plus supply from whoever holds the supply contract, and the only authoritative source for it is your own bill.
The export rules changed underneath everyone on January 1, 2025. Illinois moved from full-retail net metering to supply-only netting for new solar customers: exported energy still offsets the supply portion of your bill, but delivery charges are no longer canceled by exports. ComEd’s explanation of the current crediting is at comed.com , and its residential pricing — a flat default supply rate that adjusts periodically, plus an opt-in hourly pricing alternative — is published at comed.com . The practical translation for Rockford: a kilowatt-hour you consume behind the meter avoids your full rate, while an exported one earns only the supply piece. Daytime self-consumption, load timers, and honest sizing beat the old build-big instinct.
There is a warning embedded in local word of mouth here. ComEd reported 65,704 residential net-metering customers and 479.24 MW to EIA for 2024 — one home in 57, averaging about 7.3 kW — and nearly all of that fleet interconnected under the pre-2025 full-retail regime. In a metro Rockford’s size, that means the neighbor with panels and a glowing payback story is very likely describing rules you can no longer get. Their numbers are not your numbers. Run the calculator above on the net-billing setting, put your real combined rate in, and let the current regime — not the 2024 one — tell you whether a Rockford roof clears the bar.
Source: EIA Form EIA-861, 2024 final release , accessed 2026-09-02. Average price is total residential revenue divided by total residential sales for the year — your own rate depends on your tariff and usage tier.
Rockford against the rest of Illinois
Same rate, same export rule, same installed price per watt — only the sunshine changes:
| City | kWh per kW | Payback |
|---|---|---|
| Springfield | 1,296 | 22.2 years |
| Rockford | 1,249 | 22.9 years |
| Chicago | 1,235 | 23.1 years |
A 4.9% production span across one state is the reason a single statewide number is only ever a starting point.
What Illinois pays Rockford for exported power
Illinois does not credit exports at the retail rate, and that rule reaches Rockford unchanged. The program is supply-only net metering , in force since 2025-01-01, crediting surplus power at an assumed 5.8¢/kWh, about 30% of retail, because no per-kWh figure is published against a retail rate of 19.2¢.
Because a typical home uses only about 40% of its generation as it is produced, most of what a Rockford array makes is sold at that lower rate. That is why the payback above is 31.0 years and not the 14.3 years the same hardware would return under full-retail net metering. Raising self-consumption is the lever that closes the gap.
Sources and method
- Production: modeled with PVGIS v5.2 PVcalc (European Commission JRC) using the PVGIS-NSRDB radiation database — the same NREL satellite dataset PVWatts draws on for the Americas. Assumptions: 4 kWp, standard c-Si, 14% system loss, roof mounting, 20-degree tilt, due south, horizon shading on. The 1,249 kWh per kW figure for Rockford is a modeled location point, not an interpolation from the Illinois average. PVGIS is free to use with JRC attribution requested; the underlying NSRDB is public domain (NREL/DOE).
- Real-roof derate: a separate 10% deduction for azimuth, pitch and shading, applied in the shared model rather than folded into the production data — so you can adjust it if your roof is genuinely unobstructed.
- Electricity rate: U.S. Energy Information Administration, average price by state . This is Illinois’s residential average; EIA does not publish a Rockford figure, so the state rate is used and labeled as such.
- Export rules: supply-only net metering , from our Illinois state page and the shared export-rules dataset behind it.
- State average rate: EIA Table 5.6.A, July 2026 data (released Sep 2026), used for every state-average comparison on this page.
- Payback model: shared with the solar savings calculator and the state pages — 2.5%/yr utility inflation, 0.5%/yr degradation, $150/yr running costs, one $2,000 inverter replacement in year 14, federal credit $0. The rest of the toolset — battery, sizing, financing — is under all calculators .
- Incentives: DSIRE . City and utility programs change more often than state ones — check yours directly.
Electricity rate, export regime, production figure and installed cost on this page were last verified on 30 August 2026. Export credits reset on annual tariff cycles and incentive budgets run out mid-year, so treat every figure as a snapshot at that date and confirm current terms before acting. Nothing here is tax or financial advice.
Frequently asked questions
How much do solar panels cost in Rockford in 2026?
About $24,160 for a typical 8 kW system at $3.02 per watt, before any incentive. With the federal credit at $0 in 2026 that is close to your net cost. Note that the price per watt is a Illinois market average — there is no reliable city-level cost data, so treat it as a starting point and get three quotes.
What is the solar payback in Rockford?
Roughly 31.0 years on this model, using Rockford’s own production figure of 1,249 kWh per kW and its own utility tariff (13.39¢/kWh) with each utility’s real export treatment. That includes $150 a year of running costs and one inverter replacement, which many published paybacks leave out.
Is Rockford better or worse for solar than the rest of Illinois?
Against the state figure, Rockford runs 0.3% above Illinois’s 1,245 kWh per kW — a payback 8.0 years longer than the statewide 23.0-year estimate on the same hardware at the same price.
Is solar worth it in Rockford in 2026?
At 19.22¢/kWh and 1,249 kWh per kW, an 8 kW system in Rockford pays back in about 22.9 years on this model. Treat that as a starting point for reading real quotes rather than as a quote: your roof’s orientation, its shading and the price you are actually offered will move it more than your city does.
How we calculated this
Year-1 saving = production (kW × the city’s modeled kWh per kW) × the blended kWh value (retail rate for self-use, the state export rule for exports). Payback = net cost ÷ year-1 saving, with the federal credit at $0 for 2026 purchases and cost per watt from the state’s installed-price band. Production is modeled from PVGIS/NSRDB irradiance for the city.Sources: U.S. Energy Information Administration (EIA) electricity rates · DSIRE incentive records · public IRS/OBBBA guidance. Figures are modeled estimates, not quotes or tax advice. See our methodology.
Compare with the rest of Illinois
- Solar panel cost in Illinois — The statewide picture: Illinois’s rate, incentives, export rules and the 1,245 kWh per kW average this page corrects.
- Solar panel cost in Springfield — 1,296 kWh per kW and a 22.2-year payback — better than Rockford on identical hardware.
- Solar panel cost in Chicago — 1,235 kWh per kW and a 23.1-year payback — worse than Rockford on identical hardware.
- Solar panel cost in Detroit — 1,247 kWh per kW in Michigan — the closest production match to Rockford in our data.
- Solar panel cost in Worcester — 1,252 kWh per kW in Massachusetts — the closest production match to Rockford in our data.
- All city solar figures — The 66 US cities with their own modeled production data, and the spreads between them.