Short answer: not yet. As of October 22, 2026, Massachusetts has no plug-in solar law. The House and the Senate have each passed big energy bills that include plug-in solar, and a conference committee has been working on a final version since July 29, 2026. Until a bill is signed, a grid-tied kit needs your utility's interconnection approval.
- Status
- Not law; bills in conference committee
- Bills
- House and Senate energy affordability bills (2025–2026 session)
- Likely cap
- Not final; 1,200 W is the common model
- What applies today
- Your utility's interconnection rules
- Average price
- About 30.5¢/kWh (July 2026)
Where the bills stand
In early 2026 the House passed an energy affordability bill that included plug-in solar. The Senate passed its own, larger version in July. Because the two differ on many points (from efficiency programs to gas pipe replacement), they went to a six-member conference committee, which first met on July 29, 2026. Governor Healey publicly urged lawmakers to finish. In late September the bill was still described as stalled, with negotiators aiming for a deal around the November election or in the lame-duck period that follows.
Plug-in solar is one of the less controversial parts, so it is likely to survive in some form if a final bill passes. But nothing is law until the Governor signs it, and Massachusetts bills often only take effect after a delay. We'll update this page and the state map when that happens.
What you can do today
- Ask your utility. Eversource, National Grid and Unitil handle small solar systems through their interconnection process. A plug-in kit is technically a tiny generator; read do you need to tell your utility?
- Go off-grid. A panel charging a portable power station never connects to your home's wiring. It saves far less but needs no approval. Compare in plug-in solar vs a power station.
- Look at community solar. Massachusetts has a large community solar market that renters can join. See plug-in vs community solar.
- Plan your spot so you're ready: south-facing, unshaded, near an outdoor outlet.
Plugging an unapproved grid-tied kit into an outlet in a state without a law may violate your utility's terms of service and your lease, and may affect your insurance. Wait for the law or get approval.
What a kit could save in Massachusetts
| Setup | Produced per year | Saved per year |
|---|---|---|
| 400 W kit, vertical on a south railing, some shade | ~320 kWh | ~$91 |
| 800 W kit, vertical on a south railing, some shade | ~630 kWh | ~$154 |
| 800 W kit, tilted south, no shade | ~1,000 kWh | ~$244 |
| 1,200 W kit, tilted south, no shade | ~1,500 kWh | ~$297 |
Estimates assume you use 80% of the output (95% for 400 W, 65% for 1,200 W) at 30.5¢/kWh. Only Hawaii, California and Maine paid more. Try your numbers with the calculator, preset for Massachusetts.
Frequently asked questions
Is balcony solar legal in Massachusetts?
Not under a specific state law yet. As of October 22, 2026, the House and Senate have each passed large energy bills that include plug-in solar language, and a conference committee has been negotiating a final version since July 29, 2026. Until a bill is signed, a solar device that feeds your home's wiring falls under your utility's normal interconnection rules.
Can I use a plug-in solar kit in Massachusetts now?
Only with your utility's approval through its interconnection process. Plugging a grid-tied kit into an outlet without approval may break your utility's terms of service. Off-grid uses, such as a panel charging a portable power station, don't feed the grid and don't need approval.
What would the Massachusetts plug-in solar limit be?
The final text isn't settled. Most recent state laws use 1,200 W, and summaries of the House bill describe a similar cap. Check back once the conference committee releases its report.
How much could balcony solar save in Massachusetts?
At about 30 cents per kWh, a well-placed 800 W kit could save roughly $150 to $240 a year, among the best returns in the country.
Update log
- Page published. Status: in conference committee, not law.
Sources and official texts
- Senator Mike Barrett: Barrett tapped to lead Senate negotiations (July 16, 2026)
- Daily Hampshire Gazette: Healey eyes winter energy relief as affordability bill remains stalled (Sept 21, 2026)
- MASSPIRG: Massachusetts House passes new energy bill
- MASSPIRG: Senate passes energy bill making key advances in solar
- U.S. EIA: Electric Power Monthly, Table 5.6.A (July 2026 prices)