Small plug-in solar systems are drawing interest from renters and homeowners who want to offset some of their electricity use without installing rooftop panels.
Often called balcony solar, plug-in solar is just the latest way people have been finding new uses for solar at home. For another example, read Green Builder Editor-in-Chief Matt Power’s popular article on solar-powered air conditioning and mini-splits. As Matt writes in it: “Someone who wants to dabble in solar can put up three panels and start saving on electricity right away.”
For balcony solar, the legal picture is changing quickly: as of October 28, 10 states had enacted laws addressing the devices, and six states’ laws were in force. Even where a law has taken effect, the rules are not uniform, and a utility approval exemption does not automatically settle every building, fire or electrical code question.
Connecticut shows why the distinction matters. The state’s 2026 law took effect October 1 and allows one qualifying system under 1,200 watts per electric meter without utility interconnection approval. But the law also requires compliance with building and fire codes. Connecticut’s proposed code revisions were rejected in April over an unrelated dispute about fire-truck access, and state officials have not set a timeline for updating the codes to address plug-in solar specifically.
In an October report, the Connecticut Mirror described confusion among state and local officials about how current codes apply. One fire marshal told the paper that installations are not legal until a code is passed. That is a local official’s interpretation, not a definitive statewide ruling. The practical point for residents is that the law removes a utility barrier while leaving questions about code compliance and local enforcement unresolved.
“Plug-in solar could make clean energy more accessible to renters and homeowners who can’t install rooftop systems,” says Green Builder Media CEO Sara Gutterman. “The opportunity is real, and so is the need for clear safety standards that keep pace with the technology.”
Six states’ plug-in solar laws had reached their effective dates by October 28: Utah, Maryland, Vermont, Maine, Colorado and Connecticut. Most set a system limit of 1,200 watts, while Colorado allows up to 1,920 watts.
Several states add requirements beyond a wattage cap. Maine allows a combined output up to 420 watts without the law’s higher-output installation and notice requirements. Above 420 watts and up to 1,200 watts, each system must be installed by a licensed electrician on a dedicated circuit with a single outlet, and the customer must notify the utility within 30 days. Maine also bars net energy billing for these systems.
Vermont permits up to 1,200 watts per meter, but only for homes with smart meters. It requires UL 3700 certification or an equivalent, bars plug-in systems from net metering, and does not compensate customers for power exported to the grid. Tenants must give their landlord at least 10 days’ notice; landlords can impose reasonable restrictions and require tenants to pay for electrical work.
Maryland allows one portable solar system of up to 1,200 watts per electric meter for residential use. Residents must notify their utility before installation and provide information about the system’s safety certification. Colorado’s law allows up to 1,920 watts, bars utilities from requiring prior approval or a device-related fee, and requires installations to follow applicable building and fire codes. The state also created protections for renters and property owners’ associations, with some provisions taking effect in 2027.
Four more states have enacted laws that are not fully operational yet. California and Virginia take effect January 1, 2027. California’s law caps systems at 1,200 watts, requires compliance with the National Electrical Code and California Electrical Code, and calls for certification of the plug-in photovoltaic system by UL or an equivalent testing laboratory. Utilities may require a simple online registration. The interconnection exemption is scheduled to expire in 2030 unless lawmakers extend it.
Virginia’s 1,200-watt law also takes effect in January. It requires safety certification and a utility notification form before installation. It gives tenants certain rights to install a qualifying device, while allowing reasonable landlord restrictions. New Jersey signed its Garden State Balcony Solar Act in September; it is scheduled to take effect March 1, 2027. It sets a 1,200-watt limit, requires a recognized plug-in system safety certification, and protects qualifying installations from blanket bans by municipalities, landlords and housing associations, while allowing reasonable placement rules and notice requirements.
New Hampshire’s law is also scheduled to begin in 2027, but its building-code provision depends on the state first certifying that a nationally recognized safety standard exists for safely connecting plug-in solar systems. Until that condition is met, the law does not provide a complete, operational code pathway.
New York’s SUNNY Act passed both legislative chambers, but as of this writing it had not become law. Its bill would exempt qualifying devices from interconnection and net-metering requirements and require the state energy code to account for them.
The state laws generally remove or limit utility interconnection review for small systems that meet specified conditions. They do not make every product marketed as “plug-and-play” compliant. Requirements vary: some states call for certification of the complete plug-in system, while others use broader language covering a nationally recognized testing laboratory or the National Electrical Code.
That distinction matters. UL Solutions told the Connecticut Mirror that certification of individual parts does not automatically certify the assembled system, because hazards can arise from how components interact. A system also needs protection that stops it from energizing the grid during a power outage, which helps protect utility line workers.
Meters and billing create another practical issue. Connecticut’s law requires a warning about possible excess generation. If a household produces more power than it is using and the meter cannot register the flow correctly, the customer may not receive a credit and could be charged for power sent back to the grid. Vermont, meanwhile, explicitly excludes plug-in systems from net metering and does not compensate exported electricity.
In states without an express plug-in solar law in force, existing utility interconnection rules and applicable electrical, building and fire codes may still govern. That does not necessarily mean plug-in solar is prohibited statewide. It means residents must check the rules that apply to their utility, community, and installation before buying a system.
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