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Plug-in solar in Massachusetts

Not yet — a bill is moving in Massachusetts

  • House passed H5175 128–27 in February 2026 (1,200 W cap, no utility fees)
  • Senate passed its version 32–8 on July 1, 2026
  • In conference committee since July 2026
  • Gov. Healey urged swift passage of energy-affordability legislation

Last verified

Status
Bill advancing
Bill
H5175 / S3143
Signed
—
Effective
—
Size cap
1,200 W AC
Avg. electricity rate
30.49¢/kWh (+67% vs US)

800 W kit · typical year

$251saved

Payback ≈ 3.6 yrs · ranks #4 of 51 for savings

Plug-in solar in Massachusetts rides on a larger energy-affordability package. The House passed H5175 by 128–27 in February 2026 with provisions capping systems at 1,200 W and banning utility fees. The Senate passed its own version (S3143) 32–8 on July 1, 2026.

A conference committee was appointed on July 16 to reconcile the two versions and met for the first time on July 29. Governor Healey has publicly urged lawmakers to finish the job.

Why Massachusetts is a top market in waiting

With residential rates above 30¢/kWh, Massachusetts would offer some of the fastest payback periods in the country. Boston, Cambridge and Somerville's large renter populations are exactly who plug-in solar is designed for.

What plug-in solar is worth in Massachusetts

Massachusetts households pay an average of 30.49¢ per kWh, 67% above the US average of 18.31¢. With roughly 4.1 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
$251
Payback ($900 kit)
3.6 yr
Energy used
824 kWh/yr
25-year net
$5,378

1,200 W kit (max)

Saved per year
$377
Payback ($1,300 kit)
3.5 yr
Energy used
1,236 kWh/yr
25-year net
$8,118

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 · Massachusetts

$251/ year

≈ $20.93 per month

Payback
3.6 yrs
Energy used
824 kWh/yr
25-year net
$5,378
CO₂ avoided
667 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. 1Don't connect a grid-tied plug-in system yet — without a law, it may breach your utility agreement.
  2. 2Consider an off-grid setup in the meantime: a panel charging a portable power station is legal everywhere.
  3. 3Cut your bill today with no-cost measures — see our guide to lowering your electric bill.
  4. 4Contact your Massachusetts state legislators: constituent support is what moved the 2026 bills.

Massachusetts plug-in solar FAQ

Is plug-in solar legal in Massachusetts?

Not yet. A plug-in solar bill is moving through the legislature. Without a law, connecting a grid-tied plug-in system may violate your utility's interconnection rules. Off-grid setups (a panel charging a portable power station) are allowed everywhere.

How much can balcony solar save in Massachusetts?

At Massachusetts's average residential rate of 30.49¢/kWh (EIA, July 2026) and about 4.1 peak sun hours a day, a south-facing, tilted 800 W kit saves roughly $251 a year, paying back a $900 kit in about 3.6 years. Vertical railing mounts produce about 30% less.

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

The bill would allow 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 Massachusetts sources and your utility.