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Plugshine

Plug-in solar in Maine

Yes — Maine has a plug-in solar law

  • Signed April 6, 2026
  • 1,200 W cap
  • Reported: small systems (under ~420 W) can be installed without an electrician; larger ones require one
  • Among the highest electricity prices in the country — fastest payback in New England

Last verified

Status
Legal — signed into law
Bill
LD 1730
Signed
April 6, 2026
Effective
July 29, 2026 · in force
Size cap
1,200 W AC
Avg. electricity rate
32.41¢/kWh (+77% vs US)

800 W kit · typical year

$260saved

Payback ≈ 3.5 yrs · ranks #3 of 51 for savings

Maine's LD 1730 was signed on April 6, 2026 and sets a 1,200-watt ceiling for plug-in systems.

Maine's version adds a tiered approach reported by bill trackers: very small systems (roughly under 420 W, i.e. a single panel) can be connected by the homeowner, while larger systems call for a licensed electrician to verify the circuit. That's a sensible compromise for older housing stock where outlet circuits may be shared or undersized.

Why Maine is one of the best states for plug-in solar

Maine households pay well over 30¢/kWh, nearly double the rate in many southern states. Even with modest winter sun, every kilowatt-hour you displace is worth a lot, which pushes payback periods down to the low single digits for a well-oriented kit.

Winter considerations

Snow and low sun angles cut winter output sharply. A steeper tilt (45–60°) sheds snow and captures more of the low winter sun; a vertical railing mount actually performs relatively well from November to February for the same reason.

What plug-in solar is worth in Maine

Maine households pay an average of 32.41¢ per kWh, 77% 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
$260
Payback ($900 kit)
3.5 yr
Energy used
804 kWh/yr
25-year net
$5,611

1,200 W kit (max)

Saved per year
$391
Payback ($1,300 kit)
3.3 yr
Energy used
1,205 kWh/yr
25-year net
$8,467

Run your own numbers

Change the orientation, mounting and size to match your balcony.

800 W
80%

Plug-in systems aren't net-metered: surplus sent to the grid earns nothing. ~80% is typical without a battery; 95%+ with one.

Estimated savings · Maine

$260/ year

≈ $21.70 per month

Payback
3.5 yrs
Energy used
804 kWh/yr
25-year net
$5,611
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

  1. 1The law is in force — you can connect a compliant system today.
  2. 2Choose a certified microinverter (UL 1741 at minimum; UL 3700 system listing is best) and stay under 1,200 W.
  3. 3Plug into a dedicated outdoor-rated outlet — never an extension cord or power strip.
  4. 4Tell your home or renters insurer, and keep the spec sheets.

Maine plug-in solar FAQ

Is plug-in solar legal in Maine?

Yes. Maine passed LD 1730, signed April 6, 2026. It has been in force since July 29, 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 Maine?

At Maine's average residential rate of 32.41¢/kWh (EIA, July 2026) and about 4 peak sun hours a day, a south-facing, tilted 800 W kit saves roughly $260 a year, paying back a $900 kit in about 3.5 years. Vertical railing mounts produce about 30% less.

What is the maximum plug-in solar size in Maine?

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

Not legal advice. Laws and effective dates can change; confirm with official Maine sources and your utility.