Solar in Connecticut

Connecticut's residential solar policy is built on full retail net metering, codified under PURA rules for systems up to 20 kW with an annual true-up. Exports are credited at the full retail rate, and surplus banked during productive summer months offsets winter consumption — a structure that, at Connecticut's $0.33/kWh rate, makes the banked credits extremely valuable. The policy applies to both dominant investor-owned utilities, Eversource Energy and United Illuminating.

The Energize Connecticut Residential Solar Investment Program (RSIP), administered through the Connecticut Green Bank, is the standout state incentive: an upfront per-watt payment (roughly $0.25/W, around $1,750 for a typical system) that directly reduces the project price. Connecticut has transitioned away from its earlier SREC structure toward this upfront-and-production model. The state also exempts solar from local property tax (CT Gen. Stat. 12-81(58)) and from the 6.35% sales tax.

The federal Section 25D residential credit expired December 31, 2025; leased and PPA systems may still access Section 48E for projects that began construction before July 6, 2026. Connecticut's policy direction has been consistently supportive under the state's clean energy goals, and the combination of retail net metering, the RSIP rebate, and the tax exemptions makes it one of the faster-payback solar markets in the country.

Connecticut's 4.4 peak sun hours reflect a classic four-season New England resource: productive summers offset by short, often cloudy winter days where output drops sharply. The Connecticut coastline from Stamford through New Haven runs marginally above the state average, while the Litchfield Hills in the northwest sit a touch below. Snow load on low-tilt arrays is a real winter factor, though most pitched roofs shed snow within a day or two of sun returning, and the lost winter production is a small slice of annual output.

Because Connecticut retains full retail net metering with an annual true-up, the optimal strategy is the classic maximize-and-bank model. A south-facing array tilted near latitude (~38–42°) captures the most annual kilowatt-hours, and surplus produced during long summer days is banked at the full retail rate to offset winter consumption — at $0.33/kWh, those banked credits are extremely valuable. There is no avoided-cost penalty for overproduction, so sizing 100–115% of annual consumption to hedge against future EV adoption or heat-pump conversion is sensible.

Rooftop constraints in older Connecticut housing stock — mature tree canopy, complex rooflines, and smaller suburban footprints — push some homeowners toward higher-efficiency panels or modest ground mounts where lot size permits. The high retail rate makes every constrained kilowatt-hour especially worth capturing.

Connecticut's $3.60/W installed cost is among the higher figures in the country, with a typical 8 kW system around $28,800 before incentives. The 30% federal residential credit (Section 25D) ended December 31, 2025. What carries the Connecticut case is the combination of the RSIP upfront rebate (~$1,750 via the Green Bank), the sales tax exemption (6.35%), the property tax exemption, and — above all — the $0.33/kWh retail rate that makes each offset kilowatt-hour worth roughly double the national average.

The math is unusually clean. An 8 kW system generating about 9,900 kWh a year displaces roughly $3,265 in annual electricity spending at the state's average rate, which drives payback near 8.8 years even without the federal credit. That figure tightens further once the RSIP rebate and tax exemptions are applied. Households with high consumption in Eversource or United Illuminating territory, particularly those heating with electricity or running multiple air conditioners in humid summers, see the fastest payback.

The RSIP is the lever most worth verifying at the time of installation, since the program's incentive steps and capacity allocations shift. The property and sales tax exemptions are stable and automatic, requiring no separate application.