Connecticut solar calculator
Size a Connecticut home solar system from your electric bill — kW, panel count, roof area, true cost with no federal credit for 2026 installs, and payback.
Quick answer: At $0.274/kWh and 4.2 peak sun hours, a $200/month bill needs about 7.79 kW — 19 × 410 W panels covering ~38 m². Gross cost is ~$20,877 with no federal credit for systems installed after 2025, offsetting $2,400 a year for a ~8.7 year payback.
Your details
Ballpark, not gospel. Sized at 78% real-world output with the Connecticut sun-hour average — confirm shading, roof angle and your RRES tariff terms with a local installer before buying. Note the 4.02¢/kWh Solar Energy Adjustment that applies to all production on 2026 netting-tariff projects — the calculator doesn't model it, so treat the payback as slightly optimistic.
The 30% credit ended — what changed
The residential clean energy credit (26 U.S.C. § 25D) gave homeowners a 30% credit on solar installed from 2022 through 2025. The July 2025 tax law ended it: no credit is available for property placed in service after December 31, 2025. That is why every figure on this page is ~30% higher than pre-2026 guides show. If your system went live by the end of 2025, tick the box above to see the credit applied; leased systems may still benefit because the leasing company claims the commercial credit. Source: IRS — Residential Clean Energy Credit.
Typical Connecticut system sizes by monthly bill
| Monthly bill | System size | Panels (410 W) | Net cost (no 2026 federal credit) | Payback |
|---|---|---|---|---|
| $100 | 4.10 kW | 10 | $10,988 | 9.2 years |
| $200 | 7.79 kW | 19 | $20,877 | 8.7 years |
| $300 | 11.48 kW | 28 | $30,766 | 8.5 years |
Computed at $0.274/kWh, 4.2 peak sun hours and $2.68/W installed, with no federal credit for 2026 installs. Run your exact bill above.
Solar in Connecticut: the details
Solar cost in Connecticut
Solar is mid-range to install in Connecticut. The EnergySage marketplace averaged about $2.68 per watt installed in 2026, with market quotes typically landing $2.28–$3.08/W — inside the $2.50–$3.50/W national band. A typical ~8 kW system grosses around $21,400, with no federal credit for 2026 homeowner installs.
What moves the number: roof age (New England roofs skew older), shading, and installer competition. Small systems here still pay back fast because rates are so high.
Export rules: getting paid for surplus power
Connecticut replaced net metering with the Residential Renewable Energy Solutions (RRES) program in January 2022. New systems pick one of two tariffs.
The Netting Tariff gives full retail-rate bill credits for exports — the natural choice for most homeowners. The Buy-All Tariff instead pays a fixed ~32.89¢/kWh for everything you generate for 20 years while you keep buying all your power from the grid — attractive if your export volume is huge. Two caveats for 2026: a 4.02¢/kWh Solar Energy Adjustment now applies to all production on netting-tariff projects, and RRES sunsets after six years — a successor program must be ordered by April 1, 2028 (HB 5340), so terms may change.
Practical takeaway: the Netting Tariff keeps Connecticut's export terms close to the old 1:1 world. Lock in before the RRES sunset reshuffles the deck.
Connecticut solar incentives
Connecticut exempts residential solar systems from the 6.35% sales tax and from property tax on the added home value. There is no state rebate or income tax credit — the export tariff and the high retail rate do the heavy lifting.
Is solar worth it in Connecticut?
Verdict: yes — one of the strongest in this batch. High rates ($0.274/kWh) and the RRES netting tariff's full retail-rate credits deliver a ~8.7-year payback even without a federal credit. Just watch the 4.02¢/kWh Solar Energy Adjustment on 2026 projects and the RRES sunset — the program ends after six years.
Questions people actually ask
Straight answers, no fluff. Then run your own numbers above.
How many solar panels do I need in Connecticut?
It follows your bill. At the Connecticut average of $0.274/kWh and 4.2 peak sun hours, a $200/month bill needs about a 7.79 kW system — roughly 19 × 410 W panels covering ~38 m² of roof.
What is the average cost of solar panels in Connecticut in 2026?
The EnergySage marketplace averaged about $2.68 per watt installed in 2026, with market quotes typically $2.28–$3.08/W — inside the national $2.50–$3.50/W band. A typical ~8 kW system grosses around $21,400, with no federal credit for 2026 homeowner installs.
What is Connecticut's RRES program?
The Residential Renewable Energy Solutions program replaced net metering in January 2022. You pick the Netting Tariff (full retail-rate bill credits for exports) or the Buy-All Tariff (a fixed ~32.89¢/kWh for everything you generate, for 20 years). A 4.02¢/kWh Solar Energy Adjustment applies to all production on 2026 netting projects, and RRES sunsets after six years.
Does Connecticut offer any solar tax credit or rebate?
Connecticut exempts residential solar systems from the 6.35% sales tax and from property tax on the added home value. There is no state rebate or income tax credit.
Is the 30% federal solar tax credit still available?
Not for homeowner purchases anymore. The residential clean energy credit (26 U.S.C. § 25D) is not available for property placed in service after December 31, 2025, under the July 2025 tax law (Public Law 119-21). Systems installed by the end of 2025 can still claim 30%, and leased systems may still benefit because the leasing company claims the commercial credit instead. (Source: IRS — Residential Clean Energy Credit.)
Is solar worth it in Connecticut?
Verdict: yes — one of the strongest in this batch. High rates ($0.274/kWh) and the RRES netting tariff's full retail-rate credits deliver a ~8.7-year payback even without a federal credit. Just watch the 4.02¢/kWh Solar Energy Adjustment on 2026 projects and the RRES sunset — the program ends after six years.
Figures last checked October 2026. Sources: residential rate and sun-hour averages via kilowattkit.com and unboundsolar.com's US sun-hours map, EIA Electric Power Monthly, NREL PVWatts/NSRDB, DSIRE, Connecticut Public Utilities Regulatory Authority; IRS — Residential Clean Energy Credit.
More US solar calculators
Compare other states: Texas, Florida, California, Arizona, North Carolina, Alabama, Alaska, Arkansas, Colorado, Connecticut, Delaware, Georgia, Hawaii, Idaho. And the national US solar calculator for country averages.
Comparing quotes? The solar cost calculator breaks down cost per watt and the solar ROI calculator maps your payback year by year. Going deeper: installation cost guide, how net metering works, how much you can save with solar and the solar batteries guide.