Connecticut pays about 29.4¢ per kilowatt-hour for residential electricity and receives about 4.4 kWh per square metre per day of sunlight — 4th and 34th respectively among the 50 states and DC tracked here. Those two numbers set the ceiling on what rooftop solar returns in Connecticut, and they point in opposite directions.
Where Connecticut sits against the rest of the country
Connecticut is 14.6¢/kWh above the median residential rate across this dataset (14.8¢/kWh) and 0.2 kWh/m²/day below the median insolation (4.6 kWh/m²/day). Under this site's standard assumptions, that combination puts Connecticut 4th of 51 for modeled payback speed, at 8.0 years against a dataset median of 13.5 years.
What actually drives payback in Connecticut
Connecticut is rate-led: upper half of the dataset for electricity price (4th), lower half for sunlight (34th). Swap Connecticut's sunlight for the dataset median and payback moves to 7.6 years (0.3 years of swing). Swap its electricity rate instead and payback moves to 14.5 years (6.6 years of swing). The rate swap is the larger of the two, so what a kilowatt-hour costs is the input deciding the outcome in Connecticut.
State incentives on record
Recorded for Connecticut: Residential Renewable Energy Solutions tariff (buy-all or netting) administered by Eversource and UI; sales and property tax exemptions.
No federal credit is applied above (Section 25D expired 31 December 2025), and export terms often matter more than the headline rate (net metering guide).
The modeled system, in numbers
At Connecticut's sunlight level a 7 kW array produces roughly 8,769 kWh a year, worth about $2,578 in first-year bill savings at 29.4¢/kWh against an assumed $22,400 installed cost. A ten-year payback at this sunlight level would require a residential rate of about 22.9¢/kWh, which Connecticut already exceeds.
States with comparable economics
Connecticut's closest analogues by modeled payback are Massachusetts (7.8 years), Rhode Island (8.9 years), Maine (9.6 years). They arrive there from different rate and sunlight combinations, so their incentive rows are the useful comparison.
- Massachusetts — modeled payback 7.8 years
- Rhode Island — modeled payback 8.9 years
- Maine — modeled payback 9.6 years