Assumes 3%/yr rate increases, 0.5%/yr panel degradation and no federal tax credit (the 30% §25D credit ended for systems installed after Dec 31, 2025). How we calculate
Data approachEIA rates · NREL sun hours · 2026 federal policy · methodology
A typical 8 kW solar system in Connecticut costs about $24,000 installed in 2026 with no federal credit. On the RRES netting tariff, modeled year-one savings are about $1,770 and simple payback is about 13.6 years. On the RRES buy-all tariff, the same system earns about $3,300 a year before income tax, a payback near 7.3 years.
Connecticut’s case rests on expensive electricity. Our model assumes 24.8 cents per kWh; EIA monthly data for 2026 shows Connecticut residential averages ranging from about 24 cents in summer to above 30 cents in winter months, against a national average near 18 cents. Higher rates shorten payback, but a new 2026 charge on netting customers (explained below) lengthens it.
This guide covers what you will pay, which incentives remain, how to size a system, how the RRES tariffs work, and a transparent payback calculation. Figures use our standard savings model and the inputs on our Connecticut solar data page.
💰 System Cost
What Does a Solar System Cost in Connecticut in 2026?
A typical 8 kW Connecticut system costs about $24,000 at a $3.00-per-watt planning price, with no federal credit subtracted. EnergySage marketplace quotes averaged about $2.60 per watt nationally in 2026, while Lawrence Berkeley National Laboratory’s 2024 cash-purchase median was about $3.50 per watt, so $3.00 sits between the two.
Data visualization
Installed cost by system size. An 8 kW Connecticut system costs $20,800 to $28,000 at $2.60 to $3.50 per watt, with no federal credit in 2026. Source: EnergySage 2026 marketplace average (about $2.60/W) and Lawrence Berkeley National Laboratory 2024 cash median (about $3.50/W).
Chart summary: Installed cost is system kW × 1,000 × price per watt. A 6 kW system runs $15,600 to $21,000, an 8 kW system $20,800 to $28,000, and a 10 kW system $26,000 to $35,000. Each extra kW adds $2,600 to $3,500 before any state incentive.
System size
Price per watt
Installed cost
Year-1 savings (netting)
Simple payback (netting)
25-year net savings (netting)
8 kW
$2.60
$20,800
~$1,766
~11.8 years
~$45,500
8 kW
$3.00 (planning)
$24,000
~$1,766
~13.6 years
~$42,300
8 kW
$3.50
$28,000
~$1,766
~15.9 years
~$38,300
Assumptions: 10,056 kWh/yr production, 24.8¢/kWh retail rate rising 3% a year, 0.87 bill offset, 0.5%/yr degradation, no federal credit, RRES netting with the $0.0402/kWh charge applied for the 20-year tariff term (years 21–25 modeled without it).
Table summary: Every $0.50 per watt changes the installed price of an 8 kW system by $4,000 and moves netting payback by roughly two years. Getting several competing quotes is the most direct way to shorten payback.
Data visualization
Simple payback by installed price. At $24,000 an 8 kW system pays back in about 13.6 years on RRES netting and 7.3 years on buy-all (pre-tax), with no federal credit. Source: GreenEnergyCalc model, NREL 4.2 peak sun hours, 24.8 cents per kWh rate assumption, PURA 2026 RRES rates.
Chart summary: At $24,000, simple payback is about 11.1 years before the 2026 charge, 13.6 years on netting after it, and 7.3 years on buy-all (pre-tax). The buy-all bars are lowest at every price, but that option sells all output to the utility rather than offsetting your own bill.
Prices include panels, inverter, racking, labor, permitting and interconnection. Eversource and United Illuminating interconnection can add several weeks after panels are installed, so ask your installer for a realistic timeline. The 2026 RRES application fee is $163 with Eversource and $200 with United Illuminating.
Solar equipment is exempt from Connecticut’s sales tax, so confirm your quote does not add it. Neighboring Massachusetts has a similar cost structure but different state programs, so do not borrow cross-border incentive figures.
Run the numbers for your state
The savings calculator loads your state's average electricity rate, sun hours and net-metering rule. Then enter your own bill and installer quote.
Free · No signup · Runs in your browser
🏛️ Incentives
Which Connecticut Solar Incentives and Tax Credits Remain in 2026?
Connecticut’s state programs remain; the federal homeowner credit does not. The Residential Clean Energy Credit (§25D), worth 30% of system cost, ended for expenditures after Dec 31, 2025, under the One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025). See the IRS FAQs on the OBBB changes.
Incentive
Status in 2026
Federal §25D residential credit (30%)
Ended for installs after Dec 31, 2025
2025 installs and carryforwards
Claim 2025 installs on the 2025 return (Form 5695); unused credit carries forward
RRES (Residential Renewable Energy Solutions)
Available: netting or buy-all tariff, rate locked for 20 years
State sales tax
Solar equipment exempt
Local property tax
Added value from solar exempt
Former RSIP upfront rebate
Closed; replaced by RRES in 2022
Federal credit for homeowner batteries
None for batteries installed in 2026
State battery incentive
Connecticut Energy Storage Solutions program; terms change, so verify current amounts
Not tax advice; confirm with a tax professional.
Table summary: The only 2026 savings that come from Connecticut rather than Washington are the RRES tariffs, the sales tax exemption and the property tax exemption. None of them is an upfront rebate on solar panels.
RRES is the core Connecticut incentive. Instead of an upfront rebate, the Public Utilities Regulatory Authority (PURA) sets tariff rates each year, applied through Eversource or United Illuminating. Once you enroll, your rate is locked for 20 years. Industry reporting says the program is authorized through Dec 31, 2027; confirm current terms with your installer and utility before signing.
Other federal paths still exist for non-homeowners. Third-party owners of leased or PPA systems may claim the §48E business credit for projects that begin construction by July 4, 2026 or are placed in service by Dec 31, 2027, and may pass some value through in the contract price. Business and nonprofit owners should consult a tax professional, because depreciation and elective-pay rules changed in 2025.
The §25C credit for heat pumps and insulation also ended after 2025. State-run IRA Home Energy Rebates (HEAR/HOMES) were not repealed, but availability depends on Connecticut’s program and remaining funds. Use the solar tax credit calculator if you are finishing a 2025 claim or carryforward. Neighboring New Jersey and New York run different programs, so verify Connecticut-specific terms.
⚡ System Size
How to Size a Solar System for a Connecticut Home
Size your system from 12 months of usage: kW = annual kWh ÷ (sun hours × 365 × 0.82). At Connecticut’s 4.2 sun hours, each kW produces about 1,257 kWh a year, so a home using 10,000 kWh needs roughly 8.0 kW.
Annual usage
System size
400 W panels
Installed cost at $3.00/W
7,500 kWh
~6.0 kW
15
~$17,900
10,000 kWh
~8.0 kW
20
~$23,900
12,500 kWh
~9.9 kW
25
~$29,800
Assumptions: 4.2 peak sun hours (NREL), 0.82 system derate, no federal credit. Actual production depends on roof orientation, tilt and shading.
Table summary: System size and cost scale almost linearly with usage, so a home using 25% more electricity needs about 25% more panels and pays about 25% more.
A south-facing roof at about 30 degrees with no shade performs best; east- or west-facing roofs produce less. Ask installers for an NREL PVWatts estimate for your address, and use the solar system size calculator to check their proposals. If your roof is within 5 to 10 years of replacement, do it first, because removing and reinstalling panels later is an added cost.
Batteries add roughly $12,000 to $16,000 installed for a 13.5 kWh-class unit, and homeowner-owned batteries installed in 2026 get no federal credit. Connecticut’s Energy Storage Solutions program may offset part of that cost. The battery storage calculator can size one for outages.
⚖️ Policy & Net Metering
How Do Connecticut’s RRES Netting and Buy-All Tariffs Work?
New Connecticut solar customers enroll in RRES, which replaced traditional net metering for new residential systems after 2021. You choose one tariff at enrollment, and it stays for 20 years:
Netting tariff: your solar offsets your household usage and exports earn credits at the retail rate. For projects applying in 2026, PURA set the REC incentive at $0.00 and added a Solar Energy Adjustment (also called the Solar Production Charge) of $0.0402 per kWh on total production, shown as a line item on your bill. Earlier enrollees pay a lower locked rate (the 2025 netting charge was $0.005/kWh).
Buy-all tariff: the utility buys all of your system’s output at a fixed rate, $0.3289 per kWh for 2026 enrollees (up from $0.3195 in 2025), for 20 years. You keep buying your household power at normal retail rates. The payments may be taxable income, so ask a tax professional.
For the 8 kW example, 10,056 kWh a year means about $404 in annual netting charges, or about $3,308 in annual buy-all payments. Both utilities use the same 2026 charge and buy-all rate.
Our baseline model uses a 0.87 bill-offset factor, meaning a right-sized system removes about 87% of the retail value of its production from your bill. The headline netting figures in this guide subtract the 2026 charge from that baseline. Rates are re-set by PURA every year, so a 2027 enrollee may see different numbers.
Which option is better depends on your usage, your tax situation and the current RRES rates. Netting suits households that use most of their solar at home. Buy-all gives more predictable income but does not offset your own bill. Ask your installer to show both side by side with the current PURA-approved rates, and use the solar net metering calculator to see month-by-month credits.
Connecticut’s approach differs from California, where exports now earn a fraction of retail, and from Rhode Island, which uses its own rules.
📈 Payback Period
Solar Payback Period and Long-Term Savings in Connecticut
On the netting tariff, an 8 kW system at $24,000 pays back in about 13.6 years (simple payback), based on year-one savings of about $1,766. On buy-all, simple payback is about 7.3 years before income tax. Over 25 years, the model projects about $42,300 in net savings on netting.
Source: GreenEnergyCalc standard model with 0.5%/yr degradation; see methodology. Buy-all income after the 20-year term is not modeled. Savings are not adjusted for inflation or financing costs.
Table summary: Netting savings grow with retail rates but carry a fixed $0.0402/kWh charge; buy-all is a flat $0.3289/kWh that does not grow. That is why buy-all pays back sooner but nets less by year 25 in this model.
Data visualization
Cumulative cash position over 25 years. A $24,000 8 kW system on RRES netting reaches about +$42,300 by year 25 with 3 percent yearly rate escalation and no federal credit. Source: GreenEnergyCalc model, 10,056 kWh per year (NREL 4.2 sun hours), 0.5 percent yearly degradation, PURA 2026 RRES rates.
Chart summary: At $24,000, the netting line crosses zero in about year 11.5 once rate escalation is included, buy-all crosses in about year 7.4, and the pre-charge baseline in about year 9.9. By year 25 the lines end near $42,300 (netting), $39,100 (buy-all, flat after year 20) and $50,000 (pre-charge baseline).
Year
Netting (after charge)
Buy-all (pre-tax)
Netting before charge
5
−$14,600
−$7,600
−$12,600
10
−$3,700
+$8,300
+$300
15
+$9,000
+$23,900
+$14,900
20
+$23,600
+$39,100
+$31,300
25
+$42,300
+$39,100
+$50,000
Cumulative net cash position after the $24,000 purchase, rounded to the nearest $100.
Table summary: Buy-all leads for the first two decades, while netting overtakes it only after year 20 in this model, helped by rising retail rates and by the charge ending with the 20-year tariff term.
Without solar, this household’s bills would total about $90,600 over 25 years (a $207 average monthly bill rising 3% a year). With solar on netting, remaining bills plus the system cost total about $48,300. For comparison, the same system completed by Dec 31, 2025 with the now-ended 30% credit would have cost $16,800 and, under the lower 2025 netting charge, paid back faster.
Financing changes cash flow. A $24,000 loan at 7% over 12 years costs about $247 a month (about $186 over 20 years), against year-one netting savings of about $147 a month, so most financed buyers start with a monthly shortfall. Leases and PPAs remain available; the owner may use the §48E credit through 2027, but compare the contract rate and escalator with your own rate.
Panel degradation of about 0.5% a year is already built into these numbers. Vermont and other New England states have similar high-rate economics but different programs. Run your own inputs through the solar payback calculator before signing any contract.
Solar vs utility company · 25-year comparison
25-year totals: 3%/yr rate increases, 0.5%/yr degradation, no federal credit. Methodology
No, not for homeowners with a system installed in 2026. The 30% Residential Clean Energy Credit (§25D) ended for expenditures after Dec 31, 2025, under Public Law 119-21. Systems completed in 2025 are claimed on the 2025 return, and unused credit from earlier years can still carry forward. Third-party owners of leased or PPA systems may use the separate §48E business credit if they meet its deadlines. Not tax advice; confirm with a tax professional.
A typical 8 kW system costs about $24,000 at a $3.00-per-watt planning price, with quotes commonly between $20,800 ($2.60/W) and $28,000 ($3.50/W). EnergySage marketplace quotes averaged about $2.60/W nationally in 2026, while Lawrence Berkeley National Laboratory's 2024 cash-purchase median was about $3.50/W. No federal credit applies to 2026 installs. Solar equipment is exempt from Connecticut's 6.35% sales tax.
For an 8 kW, $24,000 system, our model gives about 13.6 years on the RRES netting tariff and about 7.3 years on the buy-all tariff before income tax. Netting is longer because 2026 enrollees pay a $0.0402/kWh Solar Energy Adjustment on all production, about $404 a year for this system. Your result depends on your actual rate, price, roof and tariff choice.
Connecticut closed traditional net metering to new residential systems after 2021 and replaced it with the Residential Renewable Energy Solutions (RRES) program. You choose a netting tariff, which credits exports at the retail rate but charges $0.0402/kWh on production for 2026 enrollees, or a buy-all tariff paying $0.3289/kWh for all output. Each rate is locked for 20 years once you enroll through Eversource or United Illuminating.
Connecticut offers the RRES tariffs (20-year locked rates), a sales tax exemption on solar equipment and a local property tax exemption for the value solar adds to a home. The old RSIP upfront rebate is closed. Battery buyers may also qualify for the state's Energy Storage Solutions incentive, whose terms change, so check with the Connecticut Green Bank and your installer. Rates and program rules can change for new enrollees.
$207/month electric bill by state
System size and payback vary by electricity rate and sun hours — see your state.
27.97¢/kWh — Connecticut average residential price. Source: EIA Electric Power Monthly, Table 5.6.B (year-to-date through July 2026), residential average retail price (July 2026) (EIA)
Solar production
4.2 peak sun hours/day × 0.82 system derate. Approximate state-average daily solar resource (peak sun hours) based on NREL solar resource data (NSRDB); not location-specific — use NREL PVWatts for an address-level estimate. (NREL PVWatts)
Installed price
$3.00 per watt before incentives. Blended 2026 US residential installed price used by this site; EnergySage marketplace reported about $2.60/W (mid-2026); full-market medians are higher.
Federal tax credit
$0 for homeowner-owned systems installed in 2026 — the 30% §25D credit ended Dec 31, 2025 (IRS)
Net metering
Full retail net metering — solar assumed to offset 87% of the bill. Connecticut's Residential Renewable Energy Solutions (RRES) program offers a netting or buy-all tariff with a performance incentive.
Estimates only — not tax, legal or financial advice. Get at least three installer quotes and confirm incentives with your utility and a tax professional.