Is balcony solar legal in New Hampshire now?

Yes — signed into law. Gov. Kelly Ayotte signed SB 540 on July 2, 2026. The plug-in / balcony solar provisions take effect January 1, 2027. From the effective date, a single plug-in solar device up to 1,200W is legal without utility approval, interconnection paperwork, or fees.

What does SB 540 actually allow?

It allows any utility customer to use one plug-in solar device with a maximum inverter output of 1,200 watts AC per metered customer. The device must be certified by an accredited testing laboratory (UL or equivalent). No utility approval, no interconnection agreement, and no fees are required for systems within the cap.

When does the plug-in solar provision take effect?

January 1, 2027. The bill was signed July 2, 2026 but the balcony solar provisions are not in force until that date.

What can I do before January 1, 2027?

You can still install a plug-in solar kit today, but until January 1, 2027 you have to do it under your utility's existing interconnection rules — not under SB 540. Call Eversource NH, Unitil, NH Electric Cooperative, or Liberty Utilities, ask what wattage they allow behind-the-meter, use a UL-listed microinverter, and keep written confirmation.

Is Plug-In Solar Legal in New Hampshire?

Legal — signed (effective January 1, 2027) Avg rate ~24¢/kWh Updated: July 2, 2026

Quick answer: Plug-in / balcony solar is legal in New Hampshire under SB 540, signed on July 2, 2026. One system per metered customer with up to 1,200W AC inverter output is allowed without utility approval, interconnection paperwork, or fees, provided the equipment is certified by an accredited testing laboratory (UL or equivalent), effective January 1, 2027. Average residential rate is around 24¢/kWh.

Recommended starter kit for New Hampshire

Plug-in solar is legal in New Hampshire — here’s the simplest way to start.

TOP PICK

AUECOOR 600W Complete Grid-Tie Kit

$$$

600W · 6×100W panels + 1000W inverter · ships from China, ~3–6 wks

Check price on Amazon

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Y&H 600W Grid-Tie Microinverter

600W · IP65 · LCD data display

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Prices approximate — last checked July 10, 2026. Compare all kits →

✅ SB 540 signed into law July 2, 2026. Gov. Kelly Ayotte signed New Hampshire’s plug-in solar bill (SB 540) on July 2, 2026. The plug-in / balcony solar provisions allow any utility customer to use one plug-in solar device up to 1,200W per household, with no utility approval, no interconnection paperwork, and no fees — provided the device is certified by an accredited testing laboratory (UL or equivalent). The provisions take effect January 1, 2027.

What SB 540 actually does (the plug-in solar part)

SB 540 creates a clear state-level path for plug-in / balcony solar in New Hampshire. Key terms:

Cap: 1,200 watts AC inverter output — one plug-in solar generation system per metered customer.
UL-certified equipment. The microinverter (and panels where required) must be certified by an accredited testing laboratory — in practice this means a UL listing or equivalent.
No utility approval, no interconnection agreement, no fees for systems within the cap.
Effective date: January 1, 2027.

This puts New Hampshire on the same legal footing as Utah, Maine, Virginia, Colorado, Maryland, Connecticut, and Vermont.

National context: NH is the 8th state to sign

New Hampshire is the 8th U.S. state to sign a plug-in solar law. The signed-into-law list now (chronological):

Utah — HB 340 (March 2025) — first ever
Maine — LD 1730 (April 6, 2026)
Virginia — HB 395 / SB 250 (April 22, 2026)
Colorado — HB26-1007 (May 7, 2026) — highest cap (1,920W)
Maryland — HB 1532 (May 12, 2026)
Connecticut — HB 5340 (June 4, 2026)
Vermont — S.202 (June 16, 2026)
New Hampshire — SB 540 (July 2, 2026)

New York (SUNNY Act, A.9111C / S.8512C) and New Jersey (Garden State Plug-In Solar Act, S2368/A4836 — passed both chambers unanimously on June 30, 2026) have also passed their legislatures and are awaiting their Governors’ signatures.

Why New Hampshire matters: among the highest residential electricity rates in the U.S. (~24¢/kWh) — meaning an 800W kit pays back in ~3 years vs. 5–7 years in lower-rate states. SB 540 makes plug-in solar a default for any NH renter or homeowner.

What you can do now (before January 1, 2027)

You don’t have to wait until January 1, 2027 to install plug-in solar — you just have to do it under your utility’s existing interconnection rules until then. New Hampshire’s major investor-owned utilities and co-ops:

Eversource NH (largest, most of the state)
Unitil (Seacoast, Capital area)
NH Electric Cooperative (rural northern / western NH)
Liberty Utilities (small footprint)

What to ask (and get in writing):

Maximum wattage allowed behind-the-meter without a permit before January 1, 2027.
Whether a one-page interconnection notification is required.
Whether they require a specific microinverter UL-listing (UL 1741 / UL 3700).

From January 1, 2027 onwards: the 1,200W cap under SB 540 applies statewide; no utility paperwork is required for compliant kits.

Run your numbers with our savings calculator — New Hampshire’s default rate is 24¢/kWh, which makes payback unusually fast: an 800W kit typically offsets ~$190/year here, payback in ~3 years on a typical $500–700 kit.

Ready to start? Compare the top kits for your home in our Best balcony solar kits 2026 guide →

Renting an apartment / condo? Read our HOA & balcony solar guide first — even with SB 540, building rules still apply.

FAQ

Is balcony solar legal in New Hampshire now?: Yes — signed into law. Gov. Kelly Ayotte signed SB 540 on July 2, 2026. The plug-in / balcony solar provisions take effect January 1, 2027. From the effective date, a single plug-in solar device up to 1,200W is legal without utility approval, interconnection paperwork, or fees.
What does SB 540 actually allow?: It allows any utility customer to use one plug-in solar device with a maximum inverter output of 1,200 watts AC per metered customer. The device must be certified by an accredited testing laboratory (UL or equivalent). No utility approval, no interconnection agreement, and no fees are required for systems within the cap.
When does the plug-in solar part take effect?: January 1, 2027. The bill was signed July 2, 2026 but the balcony solar provisions are not in force until then.
What can I do before January 1, 2027?: You can still install a plug-in solar kit today, but until January 1, 2027 you have to do it under your utility’s existing interconnection rules — not under SB 540. Call Eversource NH, Unitil, NH Electric Cooperative, or Liberty Utilities, ask what wattage they allow behind-the-meter, use a UL-listed microinverter, and keep written confirmation.

Nearby states: Maine · Massachusetts · Vermont · see the full 50-state tracker.

Sources

Last reviewed July 2, 2026. Status: signed into law (SB 540); plug-in solar provisions effective January 1, 2027. Informational, not legal advice. Verify current New Hampshire rules and your utility’s policy directly.