Is balcony solar legal in New Hampshire now?

Not yet. SB 540 passed the New Hampshire legislature and was enrolled June 17, 2026, but it is awaiting Gov. Kelly Ayotte's signature — it has not been signed. If signed, it would allow a single plug-in solar device up to 1,200W without utility approval, interconnection paperwork, or fees, taking effect around July 27, 2026. Until then, install under your utility's existing interconnection rules.

What would SB 540 allow?

If signed, SB 540 would allow any utility customer to use one plug-in solar device up to 1,200W (panel capacity) per household. The device must be certified by an accredited testing laboratory (UL or equivalent). No utility approval, no interconnection agreement, and no fees would be required for systems within the cap.

When would the plug-in solar provision take effect?

Around July 27, 2026 — but only if SB 540 is signed. The bill has passed the legislature and is awaiting Gov. Ayotte's signature; the balcony solar provisions are not law and not in force yet.

What can I do now while SB 540 awaits signature?

You can still install a plug-in solar kit today, but you have to do it under your utility's existing interconnection rules — not under SB 540, which is not yet law. 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?

Passed legislature — awaiting Governor Avg rate ~24¢/kWh Updated: June 22, 2026

Last verified: June 22, 2026 · source data

Quick answer: Not yet signed. New Hampshire’s plug-in solar bill (SB 540) passed the legislature and was enrolled June 17, 2026, but it is awaiting Gov. Kelly Ayotte’s signature. If signed, systems up to 1,200W of panel capacity would be allowed without utility approval, interconnection paperwork, or fees, provided the equipment is certified by an accredited testing laboratory (UL or equivalent) — taking effect around July 27, 2026. Average residential rate is around 24¢/kWh.

Thinking about installing? See our best plug-in solar kits for 2026 and estimate your yearly savings.

⏳ SB 540 passed — awaiting the Governor. New Hampshire’s plug-in solar bill (SB 540) was enrolled June 17, 2026 and is on Gov. Kelly Ayotte’s desk; it has not been signed. If signed, it would 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 would take effect around July 27, 2026 if signed.

What SB 540 would do (the plug-in solar part)

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

Cap: 1,200 watts of panel capacity per household (one plug-in solar device per 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.
Would take effect around July 27, 2026 — if signed.

If signed, this would put New Hampshire on the same legal footing as Utah, Maine, Virginia, Colorado, Maryland, and Connecticut.

National context: NH has passed — awaiting the Governor

New Hampshire’s SB 540 passed the legislature (enrolled June 17, 2026) and is awaiting Gov. Ayotte’s signature. Seven U.S. states have already signed plug-in solar laws (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, effective July 1, 2026)

New Hampshire (SB 540) would be the 8th state to sign if Gov. Ayotte signs. New York (SUNNY Act, A.9111C / S.8512C) has also passed its legislature and awaits the governor.

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. If SB 540 is signed, it would make plug-in solar a default for any NH renter or homeowner.

What you can do now (while SB 540 awaits signature)

You don’t have to wait for SB 540 to be signed 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 today.
Whether a one-page interconnection notification is required.
Whether they require a specific microinverter UL-listing (UL 1741 / UL 3700).

If SB 540 is signed: from its effective date (around July 27, 2026) the 1,200W cap would apply statewide, with no utility paperwork 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 if SB 540 is signed, building rules still apply.

FAQ

Is balcony solar legal in New Hampshire now?: Not yet. SB 540 passed the legislature and was enrolled June 17, 2026, but it is awaiting Gov. Kelly Ayotte’s signature — it has not been signed. If signed, the plug-in / balcony solar provisions would take effect around July 27, 2026, allowing a single plug-in solar device up to 1,200W without utility approval, interconnection paperwork, or fees.
What would SB 540 allow?: If signed, it would allow any utility customer to use one plug-in solar device up to 1,200W (panel capacity) per household. The device must be certified by an accredited testing laboratory (UL or equivalent). No utility approval, no interconnection agreement, and no fees would be required for systems within the cap.
When would the plug-in solar part take effect?: Around July 27, 2026 — but only if SB 540 is signed. The bill has passed but is not yet law.
What can I do now while SB 540 awaits signature?: You can still install a plug-in solar kit today, but you have to do it under your utility’s existing interconnection rules — not under SB 540, which is not yet law. 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.

Sources

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

Last reviewed June 22, 2026. Status: passed the legislature (SB 540, enrolled June 17, 2026); awaiting Gov. Ayotte’s signature — not yet law. If signed, plug-in solar provisions would take effect around July 27, 2026. Informational, not legal advice. Verify current New Hampshire rules and your utility’s policy directly.

Is Plug-In Solar Legal in New Hampshire?

What SB 540 would do (the plug-in solar part)

National context: NH has passed — awaiting the Governor

What you can do now (while SB 540 awaits signature)

FAQ

Sources

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