How many watts would Massachusetts allow?

The House version caps systems at 1,200 watts. The Senate version sets no overall cap. The final limit depends on the conference deal.

Would I need permission from Eversource or National Grid?

No approval and no fees under either version. The Senate version adds a notice to your utility within 30 days of installing.

Can my landlord or condo association stop me?

The Senate version would bar unreasonable bans and void restrictive covenants; the House version says nothing about it. It depends on the final bill.

Can the bill still pass after July 31?

Yes. Under the 2025–26 joint rules, lawmakers can still vote on reports from conference committees formed by July 31. This one was formed July 16, 2026.

Is Balcony Solar Legal in Massachusetts?

Not yet. Plug-in solar is part of Massachusetts' energy affordability bill, H 5175. The House and Senate passed different versions in 2026, and a conference committee has been working out the differences since July 16. Until a final version passes and the governor signs it, grid-tied solar needs your utility's interconnection approval.

Massachusetts balcony solar at a glance

Status	🔄 Bill moving
Bill	H 5175 (Senate version S 3166)
Would take effect	Not settled until the final bill passes
Size limit	No plug-in limit set in law
Utility interconnection agreement	Not required
Utility fees	Not allowed
Certification	Certified by UL or an equivalent nationally recognized testing lab (both versions)
Renter / HOA rules	Depends on the final bill: the House version doesn't address renters, while the Senate version bars unreasonable bans and voids restrictive covenants
Last checked	October 28, 2026

What H 5175 would do

House version: systems up to 1,200 W that plug into a standard 120-volt outlet, with no interconnection agreement and no net metering.
House version: utilities couldn't require prior approval, any fee, or extra equipment beyond what's built into the device.
Senate version: no overall wattage cap, but you'd notify your utility within 30 days on a form set by the Department of Public Utilities.
Senate version: bars unreasonable bans, voids restrictive covenants, and limits tenants' liability for damage to documented gross negligence or intentional misuse.
Both versions require certified hardware, give no net metering credit, and say the utility isn't liable for damage the device causes.
The final rules depend on the conference deal, which still has to pass both chambers and be signed by the governor. The latest official record we could read is dated September 21, 2026, so check the bill page for newer action.
Today: customer solar connects under each utility's interconnection tariff, which requires an application even for small listed inverter systems.

Can I use balcony solar in Massachusetts right now?

Not as a grid-connected plug-in system with plug-in solar law protections. Until then your utility's normal interconnection rules still apply. What you can do now:

Pick a kit that's UL-certified so it qualifies on day one.
Measure your balcony or railing and check how many hours of direct sun it gets.
Use a panel with a portable power station (battery only, not plugged into your wiring). That setup never connects to the grid, so interconnection rules don't apply.

Renters, landlords and HOAs in Massachusetts

Depends on the final bill: the House version doesn't address renters, while the Senate version bars unreasonable bans and voids restrictive covenants. Even so:

Read your lease and HOA rules for anything about balcony attachments or electrical devices.
Ask in writing before mounting anything to a railing.
Prefer clamp-on or freestanding mounts that don't drill into the building.

How much can balcony solar save in Massachusetts?

Find your price per kWh on your Eversource or National Grid bill.
Check the kit's estimated yearly output for your location and the way your balcony faces (south is best, then east or west).
Multiply: yearly kWh × your price per kWh = rough yearly savings. Or use the balcony solar calculator.

Shade, railing angle and how much of the power you use while it's being made all change the result. Plug-in systems are meant to offset what your home uses, not to sell power back.

Timeline

February 26, 2026: House passes H 5175 128–27, including a 1,200 W plug-in solar section.
July 1, 2026: Senate passes its own version 32–8 (S 3166).
July 16, 2026: House rejects the Senate version; a conference committee is appointed.
July 31, 2026: Formal sessions end, but joint rules still allow votes on reports from conference committees formed by this date.
Early January 2027: The 2025–26 session ends; a bill not enacted by then dies.

FAQ

Is balcony solar legal in Massachusetts?: Not under a plug-in solar law yet. The rules are in the energy bill H 5175, which is in a House–Senate conference committee.
How many watts would Massachusetts allow?: The House version caps systems at 1,200 watts. The Senate version sets no overall cap. The final limit depends on the conference deal.
Would I need permission from Eversource or National Grid?: No approval and no fees under either version. The Senate version adds a notice to your utility within 30 days of installing.
Can my landlord or condo association stop me?: The Senate version would bar unreasonable bans and void restrictive covenants; the House version says nothing about it. It depends on the final bill.
Can the bill still pass after July 31?: Yes. Under the 2025–26 joint rules, lawmakers can still vote on reports from conference committees formed by July 31. This one was formed July 16, 2026.

Sources

This page explains the law in plain language. It is not legal advice. Last checked October 28, 2026.