New Hampshire's SB 540 was signed by Governor Kelly Ayotte on July 2, 2026 and takes effect on January 1, 2027. It defines portable solar generation devices of up to 1,200 watts and exempts them from utility interconnection and net-metering requirements. Both homeowners and renters are covered.
A word from local inspectors
In September 2026, the City of Dover's energy commission and electrical inspector publicly urged residents to be cautious: buy certified equipment, don't overload circuits, and don't use extension cords or adapters. That's good advice everywhere — and exactly why we recommend certified microinverters and a dedicated outlet.
Is it worth it in New Hampshire?
With residential rates well above the national average, New Hampshire is one of the better markets for plug-in solar despite average sunshine.
What plug-in solar is worth in New Hampshire
New Hampshire households pay an average of 26.60¢ per kWh, 45% 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
- $214
- Payback ($900 kit)
- 4.2 yr
- Energy used
- 804 kWh/yr
- 25-year net
- $4,444
1,200 W kit (max)
- Saved per year
- $321
- Payback ($1,300 kit)
- 4.1 yr
- Energy used
- 1,205 kWh/yr
- 25-year net
- $6,716
Run your own numbers
Change the orientation, mounting and size to match your balcony.
Estimated savings · New Hampshire
$214/ year
≈ $17.81 per month
- Payback
- 4.2 yrs
- Energy used
- 804 kWh/yr
- 25-year net
- $4,444
- 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
- 1Wait until January 1, 2027 before connecting to an outlet; buy and plan now.
- 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.
New Hampshire plug-in solar FAQ
Is plug-in solar legal in New Hampshire?
Yes. New Hampshire passed SB 540, signed July 2, 2026. It takes effect on January 1, 2027. 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 New Hampshire?
At New Hampshire's average residential rate of 26.60¢/kWh (EIA, July 2026) and about 4 peak sun hours a day, a south-facing, tilted 800 W kit saves roughly $214 a year, paying back a $900 kit in about 4.2 years. Vertical railing mounts produce about 30% less.
What is the maximum plug-in solar size in New Hampshire?
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
- Valley News — NH balcony solar law takes effect in 2027
- NHPR — New Hampshire's plug-in solar law
- City of Dover, NH — inspector urges caution on plug-in solar (Sep 2026)
- EIA — Electric Power Monthly, Table 5.6.A (residential prices)
Not legal advice. Laws and effective dates can change; confirm with official New Hampshire sources and your utility.