Connecticut's HB 5340 was signed on June 4, 2026 and has been in force since October 1, 2026. It follows the standard 1,200-watt framework: plug-in systems that use certified equipment are exempt from the utility interconnection process.
Timing
The law took effect at the start of the darkest part of the year. That's not a reason to wait — installing in autumn means you're up and running for the high-production months from March onward — but don't judge your system by its December output.
Connecticut economics
Connecticut households pay well above the national average for electricity, which shortens payback considerably. Apartment dwellers with a south- or west-facing balcony are prime candidates.
What plug-in solar is worth in Connecticut
Connecticut households pay an average of 24.16¢ per kWh, 32% above the US average of 18.31¢. With roughly 4 peak sun hours a day, here is what a well-placed system produces and saves. We assume panels facing south at about 30°, 86% system efficiency and 80% of output used on-site.
800 W kit (2 panels)
- Saved per year
- $194
- Payback ($900 kit)
- 4.6 yr
- Energy used
- 804 kWh/yr
- 25-year net
- $3,954
1,200 W kit (max)
- Saved per year
- $291
- Payback ($1,300 kit)
- 4.5 yr
- Energy used
- 1,205 kWh/yr
- 25-year net
- $5,980
Run your own numbers
Change the orientation, mounting and size to match your balcony.
Estimated savings · Connecticut
$194/ year
≈ $16.18 per month
- Payback
- 4.6 yrs
- Energy used
- 804 kWh/yr
- 25-year net
- $3,954
- CO₂ avoided
- 651 lb/yr
Monthly savings profile
Estimates only. Rate: EIA July 2026 state average; sun hours: long-term averages. See our methodology.
What to do now
- 1The law is in force — you can connect a compliant system today.
- 2Choose a certified microinverter (UL 1741 at minimum; UL 3700 system listing is best) and stay under 1,200 W.
- 3Plug into a dedicated outdoor-rated outlet — never an extension cord or power strip.
- 4Tell your home or renters insurer, and keep the spec sheets.
Connecticut plug-in solar FAQ
Is plug-in solar legal in Connecticut?
Yes. Connecticut passed HB 5340, signed June 4, 2026. It has been in force since October 1, 2026. Systems up to 1,200 W that use certified equipment can be plugged into a standard outlet without a utility interconnection agreement.
How much can balcony solar save in Connecticut?
At Connecticut's average residential rate of 24.16¢/kWh (EIA, July 2026) and about 4 peak sun hours a day, a south-facing, tilted 800 W kit saves roughly $194 a year, paying back a $900 kit in about 4.6 years. Vertical railing mounts produce about 30% less.
What is the maximum plug-in solar size in Connecticut?
The law allows up to 1,200 watts of AC output. That's roughly the safe continuous load on a standard 15-amp household circuit.
Sources
- Exact Solar — state-by-state plug-in solar update (Jul 2026)
- EIA — Electric Power Monthly, Table 5.6.A (residential prices)
Not legal advice. Laws and effective dates can change; confirm with official Connecticut sources and your utility.