Short answer: Not yet. Plug-in solar is in a Massachusetts energy bill that has been in a House-Senate conference committee since July 2026. Until it passes, a kit needs your utility's approval.
The bill in conference
- Plug-in solar is part of H.5175, a broad energy bill. The House and Senate passed different versions, and a conference committee was appointed on July 16, 2026. Its official page shows no action since.
- The House version allows up to 1,200 W, with no utility approval or fee, outside interconnection and net metering.
- The Senate version sets no wattage cap, asks you to notify your utility within 30 days after installing, and voids covenants that "unreasonably" prohibit kits.
Sources: H.5175, House text, Senate text. Read October 26, 2026.
What applies today
National Grid's 2021 interconnection tariff says a customer "has no right to operate in parallel until they have received the Authorization to Interconnect." National Grid tariff.
Many people plug kits in anyway. That doesn't make it allowed, and your utility could ask you to disconnect.
The bottom line
Every state, side by side: the 2026 list. Which kit pays back fastest: 10 kits ranked. What one would save you: the free balcony solar calculator.
Already have solar on the roof?
Before you buy a plug-in kit, find out whether your house is already sending power to the grid at midday. If it is, a plug-in kit mostly adds to that export instead of cutting your bill. The WattHacker monitor shows your rooftop production live, panel by panel. It plugs into the SunPower or Enphase gateway you already own.
- Home use is shown too where your system was installed with consumption meters. Without them you see production only. Your utility's hourly usage download also shows export.
- A plug-in kit is a separate inverter. Your rooftop gateway will not count its production, so neither will we.
- Free to see your panel data, with no subscription. The monitor is a one-time purchase with a 30-day money-back guarantee.
Still have questions about your own system? I'll go through it with you — your panels, your bill, and what's worth doing about it.
Book a free callAre your panels installed by SunPower or Enphase? See how it works for SunPower or Enphase, or see a demo.
Real panels, real production.
Common questions
Is balcony solar legal in Massachusetts?
Not yet. Plug-in solar is in a Massachusetts energy bill that has been in a House-Senate conference committee since July 2026. Until it passes, a kit needs your utility's approval.
Which states allow plug-in solar?
As of October 2026, about ten states have signed plug-in solar laws, several starting in 2027. The national page lists them all, with limits and start dates.
See your own panels, live.
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