Solar States

Connecticut · homeowner planning guide

Solar panels in Connecticut: costs, incentives & payback

Connecticut RRES offers Buy-All and Netting choices through Eversource and United Illuminating. For Eversource 2026 Netting applications, a production charge must be included in savings estimates.

Sun resourceModerate sun resource
Sun (2024)4.04 kWh/m²/day
Federal credit30% (2022–25 installs only)
State incentiveCheck eligibility
Export rulesCheck utility tariff

Guide updated: 2026-09-23. Local source-check scope and unresolved items are listed below.

Plan with your own numbers

Solar tools for Connecticut homeowners

Start with the solar calculator using your bill, fixed charges, self-consumption and export-price assumptions. The utility rules below are not automatically applied in the calculator. Utility production charges may need a separate adjustment; this is a planning scenario, not a utility tariff simulation or guaranteed savings.

Estimate solar size and cost in ConnecticutCalculate panels for a Connecticut homeEstimate Connecticut solar paybackCheck solar production context for ConnecticutPlan a home battery around Connecticut export rules

Local export rules and incentives

Editorial review: 2026-09-23. The four sections have source support within the named program/statute scope, including Eversource and United Illuminating 2026 compensation. Municipal-provider rules, Eversource overview AC/DC clarification, the UI meter-fee refund conflict, and project-specific tax/interconnection approval remain open. A reviewed tariff is not an incentive award.

Export credit

Source-checked within the stated scope

Eversource lists a 2026 Buy-All rate of $0.3289/kWh including RECs, locked for a 20-year term after enrollment. All production is sold and household consumption is purchased separately. Netting instead serves the home first: monthly excess produces retail-rate bill credits carried forward, with cash-out only when electric service ends. For Eversource applications submitted in 2026, the base REC payment is $0 and a Solar Energy Adjustment of $0.0402/kWh applies to total solar production, not just exported energy. Do not model this as free full-retail netting or apply these Eversource prices to another utility. Buy-All cash-payment and annual on-bill cash-out rules differ from Netting. Separately, United Illuminating Rider RRES No. 2467, effective January 1, 2026, lists Buy-All at $0.3289/kWh, Netting at the applicable retail rate with $0.0000/kWh base REC incentive, and a $0.0402/kWh Solar Production Charge on metered production. The UI production-charge rate is fixed for its 20-year tariff term; the retail credit is not a fixed 20-year retail price. Buy-All accrued credits may be cashed out annually; Netting credits at account closure. UI fixes the Buy-All/Netting choice at application, with no later switch.

Supporting sources: Eversource: Connecticut RRES, 2026 application terms; United Illuminating Rider RRES 2467, effective January 1, 2026.

Utility coverage

Source-checked within the stated scope

PURA identifies Eversource and United Illuminating as RRES administrators. RRES launched in January 2022 to replace the legacy net-metering and residential solar incentive programs for new program enrollment. United Illuminating distinguishes applications before January 1, 2022 from newer Renewable Energy Solutions applications. Confirm utility, application vintage and approved tariff; these schedules are not established for municipal electric accounts. United Illuminating 2026 compensation is separately supported by Rider RRES 2467. Its completed application date determines the rate vintage; its Approval to Interconnect date starts the term. Existing Green Bank RSIP incentive approval for the same project excludes participation under this UI rider.

Supporting sources: PURA: Residential Renewable Energy Solutions program; United Illuminating: distributed generation and application process; United Illuminating Rider RRES 2467, effective January 1, 2026.

Incentive eligibility

Source-checked within the stated scope

For 2026 Eversource applications, its page lists additional Buy-All incentives of $0.055/kWh for qualifying income at or below 60% of state median income, or $0.0275/kWh in an economically distressed community. The corresponding Netting additions are $0.035/kWh or $0.0175/kWh. Only one additional incentive may be received; eligibility must be established. Buy-All base compensation already includes REC value, so do not add it twice. These are production-based program terms, not an upfront rebate. Separately, § 12-412(117)(A) exempts qualifying solar electricity systems, related equipment and installation services from sales/use tax. The residential property exemption in § 12-81(57)(A)(i) requires qualifying installations on or after October 1, 2007 at single-family or two-to-four-unit dwellings (or farms), with estimated annual production no greater than estimated annual load. Under subsection (E), apply to the local assessor by November 1 of the assessment year; late filing generally waives that year, and permit-requiring alterations require a new application. Confirm classification and documentation with the tax authority; no fixed dollar tax saving or separate storage award is promised. UI Rider 2467 separately confirms 2026 income/distressed-community adders at the same quoted amounts; qualification and the one-adder choice still matter.

Supporting sources: Eversource: Connecticut RRES, 2026 application terms; Connecticut General Statutes § 12-412(117), sales/use tax; Connecticut General Statutes § 12-81(57), property-tax exemption; United Illuminating Rider RRES 2467, effective January 1, 2026.

Application and limits

Source-checked within the stated scope

Eversource requires a current or future customer at a 1–4 family property and a system no greater than 25 kW sized to historical household load, with specified optional EV/heat-pump allowances. Its overview does not explicitly label that size figure AC or DC; obtain written confirmation for the design. It requires signing up for a Home Energy Solutions assessment unless the home was built in 1980 or later. United Illuminating Rider 2467 explicitly limits individual qualified projects to 25 kW AC measured by inverter nameplate, with a separate per-unit rule for qualifying multifamily affordable housing. Application fees are nonrefundable. There is a meter-fee refund conflict: the tariff says metering fees are refundable if the project is not installed, while the web overview calls meter fees nonrefundable. Obtain written clarification before paying or withdrawing. UI requires Approval to Interconnect before energizing and will not compensate pre-approval operation. Do not treat program eligibility, fee payment or application submission as permission to operate.

Supporting sources: Eversource: Connecticut RRES, 2026 application terms; United Illuminating: distributed generation and application process; United Illuminating Rider RRES 2467, effective January 1, 2026.

Official sources and review status

A source review is not an approval of your application, a confirmed rebate reservation or a verification of all utility tariffs. Dates shown apply only to the cited documents, not every claim about the state.

Before you sign

  1. Get the tariff effective for your application date and a worked example of a bill with exports.
  2. Check net system cost without any unreserved rebate; confirm each separately named incentive.
  3. Keep written interconnection approval, tariff and incentive documents with your quote.

Before comparing solar quotes in Connecticut

For your Connecticut project, is the quoted benefit an installation rebate, a production payment or an electricity bill credit?

  1. Compare cash cost first. Divide the quoted solar cash price by system size in watts. Keep batteries, roof work and financing fees separate. Compare quotes by cost per watt.
  2. Separate incentives from bill savings. Require written eligibility and approval for each state or utility benefit. A pending application is not a guaranteed payment.
  3. Test the payback assumptions. Use your actual electricity bill and applicable export terms. Estimate your solar break-even year without unconfirmed incentives.

Federal credit: distinguish a past installation from a new one

The IRS states that the residential clean energy credit is not available for property placed in service after December 31, 2025. Paying before that date does not make a later completed installation eligible. A qualifying unused credit from an earlier installation is a separate tax question. Read the IRS credit guidance and installation-deadline FAQ (question 7).

Federal guidance checked 2026-09-11. This is general planning information, not individualized tax advice.

Source checks for Connecticut homeowners

EIA Connecticut energy profile provides state energy context, not a residential installation quote. Confirm current incentives with the administering agency and export terms with the utility named on your bill. These research links are not a confirmation that every local program described in the guide is currently open.

Questions homeowners ask

How is excess solar electricity credited?
Eversource lists a 2026 Buy-All rate of $0.3289/kWh including RECs, locked for a 20-year term after enrollment. All production is sold and household consumption is purchased separately. Netting instead serves the home first: monthly excess produces retail-rate bill credits carried forward, with cash-out only when electric service ends. For Eversource applications submitted in 2026, the base REC payment is $0 and a Solar Energy Adjustment of $0.0402/kWh applies to total solar production, not just exported energy. Do not model this as free full-retail netting or apply these Eversource prices to another utility. Buy-All cash-payment and annual on-bill cash-out rules differ from Netting. Separately, United Illuminating Rider RRES No. 2467, effective January 1, 2026, lists Buy-All at $0.3289/kWh, Netting at the applicable retail rate with $0.0000/kWh base REC incentive, and a $0.0402/kWh Solar Production Charge on metered production. The UI production-charge rate is fixed for its 20-year tariff term; the retail credit is not a fixed 20-year retail price. Buy-All accrued credits may be cashed out annually; Netting credits at account closure. UI fixes the Buy-All/Netting choice at application, with no later switch.
Do the same solar rules apply to every utility?
PURA identifies Eversource and United Illuminating as RRES administrators. RRES launched in January 2022 to replace the legacy net-metering and residential solar incentive programs for new program enrollment. United Illuminating distinguishes applications before January 1, 2022 from newer Renewable Energy Solutions applications. Confirm utility, application vintage and approved tariff; these schedules are not established for municipal electric accounts. United Illuminating 2026 compensation is separately supported by Rider RRES 2467. Its completed application date determines the rate vintage; its Approval to Interconnect date starts the term. Existing Green Bank RSIP incentive approval for the same project excludes participation under this UI rider.
Which residential solar incentives are confirmed?
For 2026 Eversource applications, its page lists additional Buy-All incentives of $0.055/kWh for qualifying income at or below 60% of state median income, or $0.0275/kWh in an economically distressed community. The corresponding Netting additions are $0.035/kWh or $0.0175/kWh. Only one additional incentive may be received; eligibility must be established. Buy-All base compensation already includes REC value, so do not add it twice. These are production-based program terms, not an upfront rebate. Separately, § 12-412(117)(A) exempts qualifying solar electricity systems, related equipment and installation services from sales/use tax. The residential property exemption in § 12-81(57)(A)(i) requires qualifying installations on or after October 1, 2007 at single-family or two-to-four-unit dwellings (or farms), with estimated annual production no greater than estimated annual load. Under subsection (E), apply to the local assessor by November 1 of the assessment year; late filing generally waives that year, and permit-requiring alterations require a new application. Confirm classification and documentation with the tax authority; no fixed dollar tax saving or separate storage award is promised. UI Rider 2467 separately confirms 2026 income/distressed-community adders at the same quoted amounts; qualification and the one-adder choice still matter.
What application, capacity and funding limits should I check?
Eversource requires a current or future customer at a 1–4 family property and a system no greater than 25 kW sized to historical household load, with specified optional EV/heat-pump allowances. Its overview does not explicitly label that size figure AC or DC; obtain written confirmation for the design. It requires signing up for a Home Energy Solutions assessment unless the home was built in 1980 or later. United Illuminating Rider 2467 explicitly limits individual qualified projects to 25 kW AC measured by inverter nameplate, with a separate per-unit rule for qualifying multifamily affordable housing. Application fees are nonrefundable. There is a meter-fee refund conflict: the tariff says metering fees are refundable if the project is not installed, while the web overview calls meter fees nonrefundable. Obtain written clarification before paying or withdrawing. UI requires Approval to Interconnect before energizing and will not compensate pre-approval operation. Do not treat program eligibility, fee payment or application submission as permission to operate.
Is solar worth it in Connecticut?
It depends on sun resource, your utility's net metering or net-billing rules, and what you pay for electricity. The federal 30% clean-energy credit applied to systems in service by December 31, 2025; per the IRS it is not available for property placed in service after that date. Connecticut-specific programs are being verified and will appear here as confirmed.
How much does the federal solar credit cover?
The federal Residential Clean Energy Credit covered 30% of qualified costs for systems in service from 2022 through December 31, 2025. Per the IRS, the credit is not available for property placed in service after that date. Connecticut-specific programs are being verified and will appear here as confirmed.
Do I need a battery with solar in Connecticut?
Not always — where utilities pay full-retail net metering, a battery's value is lower. Where net billing cuts export credits, batteries let you shift your own energy into the evening. Your Connecticut utility tariff determines the math.
Can I install solar panels myself in Connecticut?
DIY installs happen, but most utilities require a licensed electrician, permits and an inspection before interconnection. Check Connecticut's permit office and your utility's interconnection rules first.

How to buy solar in Connecticut — the honest version

  1. Model the math first. Get 2–3 quotes in $/W (dollars per watt, before credit) and compare on that number — not on "savings" projections. Use the quote scorecard.
  2. Check your utility's export rules. Retail net metering vs net billing changes whether you want a battery — see the notes above and the battery planner.
  3. Ask about the hidden three: permits, HOA rules and roof condition — walk the 16-question checklist before you sign.
  4. Confirm local sun. Measured 2024 irradiance for Connecticut is on the sun look-up; national literacy starts at the federal credit guide.