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Plug-in solar lets anyone generate free electricity — no roof, no permit, no contractor. A single panel on your balcony can meaningfully cut your bill, especially as rates keep rising.

What is plug-in solar? →How it saves you money →
Pending legislationUpdated May 31, 2026

Coming Soon — Massachusetts is considering plug-in solar legislation

Would permit residential plug-in solar systems up to 1,200W connected to standard outlets without utility approval or interconnection requirements.

Get notified when Massachusetts goes legal

We track every vote. One email when this bill passes — no spam.

Recently updated — this page was last reviewed on May 31, 2026. Law data is current as of that date.

Bill Status

Bill number
H4744 / H5151
Expected vote
Advancing — 2026 session
Proposed watt cap
1200W AC
As written in current bill text — subject to amendment
Primary utility
Eversource MA / National Grid MA

Pending bill information may change as legislation advances. Bill text, watt caps, and effective dates are subject to amendment or failure. This is not legal advice.

What to Expect If This Passes

🔌

Up to 1200W, no permit

The bill as drafted would allow systems up to 1200W AC connected to a standard household outlet — no permit, no utility approval required.

⚡

No net metering

The bill does not include net metering for plug-in systems. Excess generation would not be credited. Self-consumption maximization is key.

🏠

Renters included

The bill does not restrict installation to homeowners. Renters would still need landlord consent, but no permanent installation is required.

Electricity Cost Trend

↑ 4.0%/yr avg — Moderate
Rates up 22% over the past 5 years
From $0.238/kWh in 2021 → $0.290/kWh today. Every year you delay solar, your bills compound.
4.0%
avg. annual increase
Historical avg. residential rate ($/kWh)
$0.238
2021
$0.248
2022
$0.258
2023
$0.268
2024
$0.279
2025
$0.290
2026
20-year projected rate
$0.635/kWh
at 4.0%/yr escalation
Extra you'll pay over 20 yrs*
$2,836
vs. today's rates (1,000 kWh/mo household)
Best time to go solar
Now
Each year of delay = a year of higher grid bills

Estimated Savings Preview

Based on Massachusetts's $0.290/kWh avg. rate and 4.1 sun hours/day. Use this to plan — not to make a purchase yet.

Default: 4.1h/day (Massachusetts avg)
$1,200
$900$2,200
800W
400W1200W
60%
30%100%
$0.290/kWh
$0.080/kWh$0.400/kWh
Rate Escalation Scenario
Year 1 Generation
611 kWh
51 kWh/mo
Year 1 Savings
$177
$15/mo
Payback Period
7 yrs
by year 7
25-Year Savings
$6,878
net $5,678
ℹPanels typically last 25–30 years with a 25-year output warranty. Microinverters carry a 10–25 year warranty depending on brand. Battery modules degrade faster — expect 10–15 years before capacity drops below 80%. The 25-year savings figure above assumes the panel and inverter run for the full window; budget ~$200–$400 for an inverter swap around year 15 if needed.
Cumulative Savings vs. Break-even ($)
Selected scenario2% escalation8% escalationBreak-even
Calculator AssumptionsSavings estimates are projections based on average sun hours, self-consumption assumptions, and rate escalation scenarios. Actual results vary by roof orientation, shading, usage patterns, and local rate schedules. The federal ITC for residential solar expired December 31, 2025.

Stay in the Loop

We monitor the Massachusetts legislature and will email you the moment H4744 / H5151 is signed into law or fails. No spam — one email per bill outcome.

Legal DisclaimerLaws change. Information on this site reflects our best understanding of current statutes as of the date shown. It is not legal advice. Verify requirements with your state utility commission, local building department, and a qualified attorney before installation.