Connecticut became the sixth US state to legalize plug-in solar on May 20, 2026, when Governor Ned Lamont signed HB 5340 as Public Act 26-127. The law takes effect October 1, 2026.
Connecticut is significant for one simple reason: at 28.6¢/kWh, it has the fourth-highest average residential electricity rate in the country. Only Hawaii, Massachusetts, and New Hampshire are higher among the enacted states. A plug-in solar system in Connecticut saves about twice as much per kilowatt-hour as the same system in a low-rate state like Utah or Colorado.
See Connecticut's plug-in solar law details and estimated annual savings at Connecticut's 28.6¢/kWh rate.
Connecticut solar law details →What HB 5340 does
The law creates a legal pathway for plug-in solar devices under 1,200W in Connecticut. The structure mirrors other enacted states:
No utility pre-approval. Connecticut utilities, including Eversource and UI, cannot require interconnection approval or charge fees for qualifying systems.
Landlord prohibition removed. Landlords cannot block renters from installing qualifying plug-in solar systems. Reasonable placement restrictions are still allowed.
HOA restrictions limited. HOAs also cannot prohibit qualifying systems.
October 1, 2026 effective date. If you want to install before that date, standard Connecticut utility interconnection rules apply, and you need landlord permission in a rental.
The economics: Connecticut’s rates make plug-in solar compelling
At 28.6¢/kWh, Connecticut’s electricity rates turn plug-in solar into one of the faster-payback options in the country.
Hartford gets roughly 4.3 peak sun hours per day on average. For an 800W south-facing system:
800W x 4.3h x 0.85 = 2.92 kWh/day production At 70% self-consumption: 2.04 kWh/day At 28.6¢/kWh: $0.58/day, or $213/year
A $900 kit pays back in about 4.2 years. At New Haven’s slightly better sun exposure, you nudge that under four years.
For Connecticut households who pay even higher Eversource peak rates under TOU pricing, the savings per kWh in the afternoon hours can push toward 40¢/kWh, shortening payback further. The balcony solar calculator lets you input your actual Eversource or UI rate rather than the statewide average.
Comparing Connecticut to other Northeast enacted states
New Hampshire (28.1¢/kWh) and Maine (27.9¢/kWh) have nearly identical economics. Massachusetts, which has not yet enacted a law despite 33¢/kWh rates, would be the strongest plug-in solar market in the Northeast if it passes in 2026 or 2027.
Connecticut’s October 2026 effective date means renters cannot rely on the renter protections until then. But the utility restriction on requiring pre-approval effectively means most utilities are not going to actively penalize a single small plug-in system even before the law takes effect. If you want to install now and your landlord approves, the risk is low in practice.
What installation looks like in a Connecticut apartment
Most Connecticut apartments are older New England construction with double-hung windows and small balconies or fire escapes. For renters, the most common plug-in solar setup is:
A single panel on a south-facing window sill or fire escape rail. A 400–600W panel on a window-mount bracket or railing clamp is achievable in most units. Production is lower than a full two-panel balcony setup, but at 28.6¢/kWh, even 150–180 kWh/year of self-consumed production saves $43–$51.
A two-panel rail-mount on a balcony. For units with a south-facing balcony, two 400W panels on a railing clamp is the sweet spot. At Connecticut’s rates, this is a $210+/year savings setup that fits within the 1,200W legal cap.
Check whether your space qualifies using the plug-in solar readiness checker. It will note Connecticut’s October 2026 effective date and whether your setup type makes sense for the law.
Check your Connecticut apartment or home readiness for plug-in solar, including outlet type, sun exposure, and legal status.
Check your Connecticut readiness →Related: Solar Panels for Renters: A 2026 State Guide | Apartment Solar Panels: What Works in 2026
Dana Whitmore
Energy Engineer & Billing Analyst · Optiwatt Energy Advisor
Dana has spent the past three years analyzing residential electricity billing data across PG&E, SCE, and SDG&E service territories. She's reviewed billing records for thousands of California households, and built the simulation engine that powers this site's rate-plan comparisons. She holds a degree in Electrical Engineering and lives in the Bay Area.