How Plug-In Solar Works (and Why Regulations Matter)

Plug-in solar systems, sometimes called balcony solar or plug and play solar, consist of one or more solar panels paired with a microinverter (that converts the power from DC into AC power, the kind usable for your home). You put the panels on a balcony railing, patio, or yard, run a cable to an outdoor wall outlet, and the system immediately begins reducing how much electricity you draw from your utility. Read our guide to how plug-in solar works for more information.

The 1,200W Threshold: What Most Laws Say

Most plug-in solar laws in the United States set the power limit to 1,200 watts of AC output. Colorado is an exception; the limit comes in higher at 1,920W. This means the amount of power going into your home at one time from plug-in solar can't go above this level. For example, you can have 1,335W of solar panels with a 1,200W microinverter. The microinverter keeps the system within the 1,200W limit, even if the panels can produce more power.

States with Enacted Plug-In Solar Laws

Eight states have signed plug-in solar into law. Six are already in effect; two more have been signed but don't take effect until later dates. States are listed alphabetically below.

Colorado: Signed, Effective January 1, 2027

Governor Jared Polis signed House Bill 26-1007 into law on May 7, 2026, after it passed the House 48–16. The bill sets the highest wattage limit of any enacted state.

What the law allows:

• Portable-scale solar generation output up to 1,920W, the highest cap in the country
• No utility approval, no interconnection agreement, no fees for qualifying devices
• Meter collar adapters, with the Public Utilities Commission required to update interconnection rules by December 31, 2026

General provisions took effect August 12, 2026. The ban on selling uncertified devices under 391W and the anti-restriction/HOA protections are separately delayed to January 1, 2027 under the bill's own text.

Connecticut: Signed, Effective July 1, 2026

Governor Ned Lamont signed House Bill 5340 (Public Act 26-127) on May 20, 2026, as part of a broader renewable energy package.

What the law allows:

• Portable solar photovoltaic output up to 1,200W
• No utility approval, interconnection agreement, or fees for qualifying devices
• Devices must meet the state building and fire codes and be certified by UL or another nationally recognized testing lab

Maine: Law in Effect Since July 15, 2026

Governor Janet Mills signed LD 1730 into law on April 6, 2026.

What the law allows:

• Eligible systems up to 1,200W combined inverter output
• Systems up to 420W may be self-installed with no utility notification
• Systems between 420W and 1,200W require a licensed electrician on a dedicated single-outlet circuit, plus utility notification within 30 days of installation

Maryland: Law in Effect Since May 12, 2026

Governor Wes Moore signed House Bill 1532 (the Utility RELIEF Act) on May 12, 2026, as an emergency bill.

What the law allows:

• One portable solar energy generating system per residential meter, up to 1,200W
• output
• Connection via a standard electrical outlet
• No utility approval required; devices must be UL-certified or meet an equivalent standard

New Hampshire: Law in Effect Since July 2, 2026

Governor Kelly Ayotte signed Senate Bill 540-FN (Chapter 262) on July 9, 2026, with the substantive provisions effective retroactive to July 2, 2026.

What the law allows:

• Portable solar generation devices up to 1,200W, output connected through a standard 120V receptacle
• No utility approval, interconnection agreement, or fees for qualifying devices
• Devices must comply with UL 1741 or IEEE 1547 anti-islanding standards

Utah: Law in Effect Since May 7, 2025

Utah was the first state in the country to formally legalize plug-in solar. House Bill 340 (Solar Power Amendments) was signed by Governor Spencer Cox on March 25, 2025, and took effect May 7, 2025. It passed the Utah House 72–0 and the Senate 27–0 — truly unanimous bipartisan support.

What the law allows:

• Systems up to 1,200W AC connecting via a standard 120V outlet
• No interconnection agreement, no utility approval, no fees, and no additional equipment requirements
• Devices must be certified by UL or an equivalent nationally recognized testing laboratory and must include anti-islanding protection

Note: Utah plug-in solar systems are not eligible for Utah's net metering program. The benefit is bill reduction, not export credits.

Vermont: Law in Effect Since July 1, 2026

Governor Phil Scott signed S. 202 (Act 149) into law on June 16, 2026.

What the law allows:

• Plug-in photovoltaic devices up to a combined 1,200W output per electric meter
• No utility approval, interconnection agreement, or fees for qualifying devices
• Devices must connect only to smart meters and comply with UL 3700 or an equivalent standard
• Renters must give landlords 10 days' notice before installing

Virginia: Signed, Effective January 1, 2027

Virginia became one of the earlier states to legalize plug-in solar when Governor Abigail Spanberger signed House Bill 395 / Senate Bill 250 (Chapter 1052) into law on April 22, 2026.

What the law allows (effective January 1, 2027):

• Systems up to 1,200W connecting via a standard outlet on the customer's side of the meter
• No utility approval, no interconnection agreement, no fees
• Devices must include anti-islanding protection and meet current National Electrical Code standards
• Landlords with more than four rental dwellings cannot prohibit tenants from using qualifying devices
• The State Corporation Commission's notification form is due by September 1, 2026, and a safety work group report is due by November 15, 2026, ahead of the law's effective date

New Jersey

New Jersey: Signed September 1, 2026. Effective March 1, 2027. Max output: 1,200W. Bill: S2368 / A4836.

The Garden State Balcony Solar Act (S2368/A4836) was signed June 30, 2026 by Governor Sherrill. It allows portable solar generation devices up to 1,200W of output without an installation permit or utility approval, and it prohibits landlords and HOAs from banning these devices.

Sources: Legiscan A4836, LegiScan S2368

States Where Legislation Is Advancing in 2026

California

SB 868 (the Plug and Play Solar Act, Sen. Scott Wiener) passed the Senate Energy, Utilities and Communications Committee 14–0 in March 2026 and, as of late August 2026, has passed both the Senate and Assembly and is enrolled, heading to Governor Newsom's desk. As passed, it would exempt qualifying portable solar generation devices from interconnection requirements through January 1, 2030, and would restrict the sale of non-qualifying low-wattage devices from that date forward. California electricity rates have nearly doubled over the past decade, making affordability the central argument. PG&E, SCE, and SDG&E have opposed the bill.

Sources: Environmental Working Group | Bill status (Digital Democracy)

Massachusetts

H 5175 (the House's version of "An Act Relative to Energy Affordability, Clean Power and Economic Competitiveness") passed the House 128–27 on February 26, 2026, with plug-in solar provisions capping systems at 1,200W and banning utility fees for qualifying devices. The Senate passed its own version (S.3143) on July 1, 2026. A conference committee is now reconciling the two versions before a final bill goes to Governor Healey's desk.

Source: Massachusetts Legislature

New York

The SUNNY Act (S8512C / A9111C), sponsored by Sen. Liz Krueger and Assembly Member Emily Gallagher, passed both chambers of the legislature in late May 2026 and is on Governor Hochul's desk; she has until the end of 2026 to sign or veto. As passed, the bill would exempt portable solar generation devices up to 1,200W AC inverter output from interconnection and net metering requirements, taking effect 90 days after becoming law.

Source: New York State Senate bill text

Rhode Island

Companion bills H 7269 and S 2658 remain pending in committee as of the most recent session activity. Rhode Island has some of the highest electricity rates in the country, making it a closely watched state for plug-in solar advocates.

Other States with Active Bills

Bills remain pending in committee, without recent movement toward a floor vote, in Delaware (SB 270, which as introduced would cap devices at 800W), Michigan (HB 5764), North Carolina (HB 1129 / SB 957), Ohio (HB 755), Pennsylvania (HB 1971), and Washington, D.C. (B26-0602).

States with Stalled or Defeated Bills

Bills in the following states were introduced in the 2026 session but stalled, died in committee, or were defeated, in alphabetical order:

• Alaska (HB 257) — introduced but has not advanced.
• Arizona (SB 1606) — stalled in committee.
• Georgia (HB 1304) — held in committee without a vote in February 2026 after opposition from Georgia Power and the state's electric membership cooperatives; sponsors plan to reintroduce in 2027.
• Hawaii (SB 2902 / HB 1644) — stalled; Hawaii's electricity rates are the highest in the country, so a future law here would be especially high-impact.
• Idaho (HB 612) — stalled.
• Illinois (SB 3104 / HB 4371 / HB 4516) — the Senate version stalled in committee in April 2026 after union opposition over lineworker safety concerns; sponsors plan to revisit the issue in a future session.
• Indiana (SB 74 / HB 1084) — stalled in committee.
• Iowa (HF 2046 / SF 2056) — companion bills introduced but not advanced.
• Minnesota (HF 3555 / SF 3873) — folded into a broader omnibus bill; standalone progress has stalled.
• Missouri (HB 2528 / HB 2444) — introduced but has not moved forward.
• New Mexico (SB 157 / SM 10) — stalled.
• Oklahoma (HB 4060) — passed the House 88–4 but stalled in the Senate.
• Oregon (HB 4080) — did not move forward in the state legislature.
• South Carolina (H 4579) — stalled.
• Washington State (HB 2296) — passed the House 56–38 in February 2026, but the plug-in solar language was stripped before a larger bill passed.
• West Virginia (HB 5648) — stalled.
• Wyoming (HB 146) — voted down February 20, 2026.

Sources: The Current (Georgia), Capitol News Illinois, LegiScan, State of Wyoming Legislature, pv magazine USA, Bright Saver Legislation Tracker

States in the Regulatory Gray Area

In most US states that haven't yet passed plug-in solar legislation, the situation is undefined, not illegal. Plug-in solar systems occupy a gray area between "appliance" and "parallel generator" that existing utility regulations weren't written to address.

The practical reality in many of these states:

• Many utilities don't actively monitor or enforce interconnection rules for small plug-in systems, particularly those with certified zero-export technology.
• The risk of enforcement is low but not zero for systems 1,200W and under with certified equipment.
• If a utility discovers an unapproved parallel generator on your service, the outcome ranges from a warning letter to service disconnection pending compliance.

The safest approach in a gray-area state: use a system with anti-backfeed technology like a smart meter, UL-certified equipment, and reach out to your utility to ask whether a notification or simplified process applies to small zero-export systems. Many utilities are open to plug-in solar.

What Is an Interconnection Agreement, and Do You Need One?

An interconnection agreement (ICA) is a contract between you and your utility that formally authorizes your system to operate in parallel with the grid. It establishes safety standards, metering requirements, and liability terms.

Interconnection agreements were originally designed for large rooftop solar installations, systems that export significant amounts of power back to the grid and require careful coordination with utility infrastructure.

For small residential systems, the process is typically much simpler than it sounds:

• Tier 1 / Level 1 systems (under 10kW in most states): typically involve a short application, no study, no engineering review, and no fee or a minimal fee
• Processing times are usually 10–30 business days for a complete application
• Most utilities have online portals for submitting applications

If you're installing a plug and play solar system outside of Utah, here's what the process generally looks like:

1. Contact your utility's distributed generation or interconnection team (often found under "solar," "renewable energy," or "net metering" on the utility website)
2. Submit a simplified interconnection application, usually just the system specs and equipment documentation
3. Your microinverter must be certified under UL 3700 or UL 1741
4. You may need a building permit depending on your municipality; check with your local building department
5. Some utilities require inspection of the installation before the system can operate

The bottom line: for systems over 1,200W, or in states with formal ICA requirements, an interconnection agreement is usually a manageable process rather than an impossible barrier.

Frequently Asked Questions

Is plug-in solar legal in the US?

Yes, plug-in solar is not federally prohibited, and it is legal in all US states; no state has banned plug-in solar. However, some states or utilities require you to apply for an interconnection agreement before you can operate a grid-tied system. Several states, including Utah, Colorado, Vermont, New Hampshire, Connecticut, Maine, Virginia, and Maryland, have laws that allow people to install plug-in solar systems without getting their utility's permission.

What does "zero-export" mean and why does it matter?

Zero-export means the system includes technology, such as a smart meter, that monitors your home's total power draw and prevents any electricity from going back into the grid (also known as "backfeeding.") This means all the power the panels generate is consumed within your home or restricted before it can flow back to the grid.

This is important because interconnection rules were built for systems that export. If nothing crosses the meter, the strongest legal and practical argument is that utility interconnection requirements don't apply.

Can I install two 1,200W systems to get 2,400W without an interconnection agreement?

Every current and pending plug-in solar law defines the limit as 1,200W to 1,920W per dwelling or per metered account. For a larger setup, an interconnection agreement with your utility is the safest path.

Do I need a building permit?

Building permits are not typically required for plug-in systems, especially for ground-mounted systems. If you plan on installing the panels on your roof, wall, or balcony, then you want to check with your local building department on whether a building permit is needed.

Can my landlord prohibit me from using plug-in solar?

In Utah, the law does not restrict landlord authority over tenants. In Virginia (effective January 2027), landlords with more than four rental dwellings cannot prohibit tenants from using qualifying devices. In most other states, your lease terms govern; check whether there are restrictions on exterior modifications, electrical equipment, or energy devices before installing.

What is the status of the UL 3700 certification?

UL Solutions launched the UL 3700 Outline of Investigation for plug-in solar systems in December 2025. The final framework is expected in 2027. No plug-in solar kits have received a full-system UL 3700 certification. OwnWatts carries UL 3700-certified microinverters, UL-certified panels, and UL-certified mounting systems. Our products are vetted as safe, effective, and affordable.

Appendix: Full State-by-State Data Table

The table below lists every US state's plug-in solar legislative status, maximum system wattage, and key dates in one place. It reflects the same dataset used in the interactive map above and is sourced from original bill text where available.

*Colorado's general provisions took effect August 12, 2026; the sale restriction on uncertified sub-391W devices and the anti-restriction/HOA protections are separately delayed to January 1, 2027 under the bill's own text.

This article is for informational purposes and reflects the regulatory landscape as of August 31, 2026. Solar regulations change frequently. Always verify the current requirements with your state's public utilities commission and your utility's distributed generation team before installation.