- As of late September 2026, nine states have signed plug-in solar laws: Utah, Maine, Virginia, Colorado, Maryland, Connecticut, Vermont, New Hampshire and New Jersey.
- Almost all cap a system at 1,200 watts of AC output. Colorado allows 1,920 W.
- Every law requires certified equipment with anti-islanding protection, and most exclude plug-in systems from net metering.
- The details that differ, and that you need to check, are utility notification, landlord rules and the effective date.
Two years ago, plugging a solar panel into a wall outlet was a legal grey zone almost everywhere in the United States. Utilities treated any device that sends power into your home wiring as “generation”, which meant an interconnection agreement, an electrician and weeks of paperwork for a few hundred watts. Utah broke that pattern in 2025. In 2026 eight more states followed, and more than a dozen others have bills in progress.
The laws were written in different statehouses, but they borrow heavily from each other, so they share a common skeleton. Once you understand that skeleton, reading your own state’s rules takes minutes. This guide walks through it. For the current status of every state, see our plug-in solar law tracker.
In this article
- 1. A size cap, usually 1,200 watts
- 2. Certified equipment with anti-islanding
- 3. No interconnection agreement, but sometimes a notification
- 4. No net metering
- 5. Landlords, HOAs and local governments
- 6. Effective dates that lag the headlines
- What about states without a law?
- A quick checklist for your state
1. A size cap, usually 1,200 watts
Every law defines a “portable” or “plug-in” solar device by its maximum output. The number that shows up again and again is 1,200 watts AC, measured at the inverter, not at the panels. Utah, Virginia, Maryland, Connecticut, Vermont, New Hampshire and New Jersey all use it. Maine uses the same ceiling but adds a lighter tier at 420 W. Colorado went further than anyone, to 1,920 W.
Why 1,200? A standard US household circuit is 120 V and 15 or 20 A, protected by a breaker that trips at 1,800 or 2,400 W. If a solar device feeds 1,200 W into a circuit while you also run a heater on the same circuit, the wires can carry more current than the breaker sees, because the breaker only measures what comes from the panel. Keeping the solar input modest limits that risk. We explain the physics in why plug-in solar is limited to 800 W or 1,200 W.
You will also see 391 W in some laws (Colorado and Maryland). Devices at or below that figure get lighter treatment, for example no listing requirement or no need for wiring changes.
2. Certified equipment with anti-islanding
No state lets you plug in any panel you find online. The typical wording requires the device to be “listed” or “certified by a nationally recognized testing laboratory”, such as UL. Newer laws, including Maine’s and New Jersey’s, name UL 3700, the plug-in solar safety standard published in December 2025, or an equivalent.
The one feature every law insists on is anti-islanding. If the grid goes down, the inverter must stop producing within a fraction of a second. That protects line workers who expect a dead line, and it also means a plug-in kit will not keep your lights on during an outage unless it has a battery designed to run off-grid. More on that in plug-in solar during power outages.
3. No interconnection agreement, but sometimes a notification
This is the heart of every plug-in law: the device is exempt from the interconnection process that rooftop systems go through. Utilities cannot demand approval, charge fees or require extra equipment for a compliant device. States split on whether you must tell the utility at all:
| Approach | States |
|---|---|
| No notification needed | Utah, Connecticut, New Jersey, Colorado |
| One-time notification | Virginia (State Corporation Commission form), Maryland (notify your utility before installing), Maine (only above 420 W) |
| Utility may set up a notification method | New Hampshire |
Notification is not permission. In Virginia, for example, the utility has 15 days to raise a concern after you submit the form, and silence means you can go ahead.
4. No net metering
Rooftop solar owners in many states get credited for electricity they export. Plug-in owners generally do not. Utah, Vermont, Virginia, Maine and New Jersey explicitly keep plug-in devices outside net metering. In practice this means any power your home does not use in the moment flows to the grid for free. It is the main reason to size a kit to your daytime baseload, a topic we cover in self-consumption explained.
5. Landlords, HOAs and local governments
Here the laws differ most. Some are silent. Others give renters real rights:
- Virginia: landlords with more than four units cannot ban qualifying devices on balconies or patios, though they can set reasonable size and placement rules. Tenants give written notice first.
- Colorado: landlords and HOAs cannot prohibit properly secured installations; tenants must notify the landlord, who may set fire and electrical safety guidelines. These protections start January 1, 2027.
- New Jersey: tenants give landlords and associations at least 14 days’ written notice with compliance documents; blanket bans are limited and towns cannot require permits for placement or use.
Our guide to landlords, HOAs and balcony solar covers what to put in that notice.
6. Effective dates that lag the headlines
A governor’s signature is not the same as legal to plug in. Virginia’s law was signed in April 2026 but takes effect January 1, 2027. New Jersey’s was signed September 1, 2026 and takes effect March 1, 2027. New Hampshire delayed most provisions to January 1, 2027. Always check the effective date before you buy.
What about states without a law?
Buying a kit is legal everywhere. Connecting it to your home wiring without a law or utility agreement is the grey area. In most states the utility’s tariff technically requires an interconnection agreement for any generator, however small. Enforcement is rare, but if something goes wrong, your insurer may ask questions. If your state has no law yet, the safe routes are to apply for a standard interconnection, use panels off-grid with a portable power station, or wait. Bills are advancing in California, New York and Massachusetts among others.
A quick checklist for your state
- Is the law signed and in effect?
- What is the wattage cap, and does your kit’s inverter respect it?
- Does your kit carry the certification the law names (UL 3700 or equivalent)?
- Do you need to notify your utility or landlord, and how far in advance?
- Will exported power be credited? (Usually no.)
This article summarizes laws for general information and is not legal advice. Statutes and utility procedures change; confirm with your utility or state energy office before installing.