Do I Have to Tell My Utility About Plug-In Solar? Notice vs. Approval by State

By PlugInSolarUS Editorial Team · Published 2026-09-21 · Updated September 21, 2026 · 8 min read

A dated, practical guide to utility notice, approval, agreements, fees, registration, and the separate code and property questions for qualifying plug-in solar in five states.

This guide covers enacted frameworks in Maryland, Connecticut, Maine, Colorado, and Virginia as checked on September 19, 2026. It is a consumer checklist, not legal advice or an electrical design. Product listing, circuit suitability, and meter or tariff treatment can be site- and utility-specific.

First, separate the six terms

Notice tells the utility about a device; it may be before or after installation and is not automatically permission. Registration records that notice through a form. Approval means the utility must say yes first. An interconnection agreement governs connection and ongoing operation; it is more than notice. A fee is a utility charge. Local, code, and property requirements are separate obligations involving authorities, building or fire rules, an electrician, a landlord, or an association.

Why be this careful? A statute can eliminate a utility approval or agreement step for a narrow class of qualifying equipment without declaring every device safe, every outlet appropriate, or every property rule unenforceable. Do not treat an interconnection exemption as a waiver of code, fire, property, or local-authority obligations.

Five-state practical table

Maryland: required notice, but not utility approval

Maryland’s Public Service Commission says a residential customer may install no more than one qualifying portable solar energy generating system per electric meter, up to 1,200 watts. The customer must notify the electric company before installation and provide a certification describing the device’s safety features and maximum generating capacity. The same PSC guidance says the utility cannot require approval before installation or a fee or charge. If an automatic locking disconnect switch is required, however, the customer pays to have it installed.^[1]

That makes Maryland a clear example of notice versus approval: contact the serving utility first, but do not call the notice a permission slip. The PSC lists utility-specific contacts and forms, so use the route for your service territory rather than assuming one statewide portal applies. It also warns that, depending on the meter, excess generation may be treated as zero consumption or added to consumption; ask your utility how your particular meter records reverse flow.^[1] For a deeper Maryland overview, see Maryland’s Utility RELIEF Act guide.

Connecticut: agreement relief begins October 1

Connecticut Public Act 26-127 takes effect October 1, 2026. For a device meeting its definition—including a maximum output of 1,200 watts, behind-the-meter 120-volt connection, State Building Code, NEC and IEEE 1547 requirements, recognized-laboratory certification and UL 1741 requirements, and outage protection—the law exempts the device from PURA interconnection-agreement requirements. It permits no more than one such device behind a customer’s meter. The act also bars an electric distribution company from requiring company approval before installation, a related fee, or additional controls beyond those integrated into the device.^[2]

There is no customer notification or registration step in that qualifying-device provision. That absence is not a code exemption: the same act expressly preserves the State Building Code, Fire Safety Code, State Fire Prevention Code, and applicable local ordinances and regulations. It also requires a consumer warning that excess generation can be charged as usage unless the customer has a meter that allows net metering. Confirm meter behavior before using an export-credit estimate. Read the dated details in our Connecticut HB 5340 guide.

Maine: post-installation notification depends on output

Maine allows one or more eligible plug-in systems with combined inverter output up to 420 watts per service address. Above 420 watts and up to 1,200 watts, each system must be installed by a Maine-licensed electrician on a dedicated circuit with a single outlet, and the customer must give the transmission and distribution utility a Commission-prescribed notification within 30 days of installation. That notice includes the service address, inverter capacity, and a statement of compliance. The utility may not deny an installation that complies with the section.^[3]

For an eligible system, Maine bars advance utility approval, an interconnection application, agreement, or study, and a related utility fee. It also excludes these systems from net energy billing. Those are utility and billing rules, not a promise about a building. The law specifically requires a customer using a structure they do not own to avoid compromising the structure or violating state or local building, fire, or zoning codes, and to restore the structure on removal.^[3]

Colorado: possible utility notice and ongoing property limits

Colorado’s law defines a portable-scale solar generation device as one single photovoltaic system per address, with associated equipment, up to 1,920 watts to the grid and labeled and listed by a nationally recognized testing laboratory. It requires an outage-protection feature and prohibits connecting more than one device to a single wall outlet. A retail or wholesale energy provider cannot require prior approval, a related fee, or extra controls beyond those integrated under the device’s UL listing. But the provider may require notification showing the device’s presence and size in kilowatts.^[4]

Colorado preserves fire-code requirements and applicable local building codes related to health and safety. Starting January 1, 2027, property owners may still impose reasonable conditions, including prior notice and restrictions addressing fire or electrical overload, property damage, safety, and device location. The limited exemption for devices at or below 391 watts concerns specified installation or product-listing provisions that would require wiring alterations; it is not a blanket code waiver. See our Colorado HB 26-1007 guide for the state-specific framework.^[4]

Virginia: a real notice process, but not until 2027

Virginia’s current Code page labels its small portable-solar section effective January 1, 2027. When effective, it exempts qualifying devices from interconnection requirements, net-energy-metering provisions, and utility approval or device-related fees, while still requiring the customer to notify the electric service provider before installation using the Commission’s form. The utility then has 15 days to review the form for accuracy and completeness and identify deficiencies. If it does not respond in that period, the notification requirement is deemed met and the customer may install the device.^[5]

The SCC’s form is also effective January 1, 2027 and asks for device location, manufacturer/model information, output, and testing-certification information. Submit only the official form and only when the framework is effective; do not mistake the 15-day completeness review for a discretionary approval process. The form’s instructions say to resolve any identified accuracy or completeness deficiencies before proceeding.^[6] Until then, treat Virginia’s forthcoming process as future guidance, not a present installation authorization. Our Virginia notification walkthrough provides additional context.

A precise pre-purchase checklist

1. Match the rule to the address. Confirm your state, serving utility, and whether you are in a single-family or multifamily setting.
2. Document the actual configuration. Record the number of devices, output, outlet/circuit plan, listing or certification, and outage-protection feature. Aggregate limits and one-device rules matter.
3. Use the required sequence. Maryland and future Virginia require prior notice; Maine’s higher-output pathway uses notice within 30 days after installation; Colorado notice is utility-dependent; Connecticut’s qualifying provision does not create a customer submission step.
4. Keep evidence. Save the submitted form, delivery confirmation, utility response, device documentation, and any licensed-electrician record.
5. Run a separate safety and property check. Ask the local authority having jurisdiction about permits or inspection, follow code and fire requirements, and obtain any landlord, lease, or association permission that applies. A utility exemption does not answer these questions.
6. Ask about the meter before counting savings. Request written guidance on how your tariff and installed meter treat exported electricity, if any.

Still comparing equipment? Use the Plug-In Solar Buyer’s Guide to organize product and site questions before you notify anyone.

The Bottom Line

“No utility approval” does not mean “no action required.” Maryland requires advance utility notice; Maine can require a post-installation notice for systems above 420 watts; Colorado lets a provider require notice; Connecticut’s qualifying-device provision removes agreement and utility-approval steps beginning October 1, 2026; and Virginia’s notice process begins January 1, 2027. In every case, confirm your exact device and address, follow the applicable code and property rules, and keep the utility, electrical, and local-authority questions in separate lanes.

Sources

• Maryland Public Service Commission: Balcony Solar
• Connecticut General Assembly: Public Act No. 26-127 (HB 5340)
• Maine Legislature: Public Law 2026, Chapter 644 (L.D. 1730)
• Colorado General Assembly: House Bill 26-1007
• Code of Virginia § 56-596.8: Small portable solar generation devices
• Virginia State Corporation Commission: Small Portable Solar Generation Device Notification Form