Plug-in solar in New Hampshire
New Hampshire's plug-in solar law is enacted but takes effect January 1, 2027. It allows one system per metered customer up to 1,200 W AC, and does not make utility notification mandatory.
When does New Hampshire's law take effect?
Most of the act takes effect January 1, 2027. One building-code provision (RSA 155-A:16) takes effect on a later contingent date, when the Department of Energy certifies that a national standard exists for safely connecting plug-in solar to a building's electrical system.
Do you have to notify the utility?
No. Notification is not mandatory. The utility may develop a method for the customer to inform it of the system's wattage after installation, but is not required to, and may not require approval, an interconnection review, or an agreement.
What is the power limit?
One system per metered customer, with a maximum inverter output of 1,200 W AC.
What certification does New Hampshire require?
Certified by a nationally recognized testing laboratory to meet nationally recognized safety standards applicable to distributed energy resources. The act does not name UL 3700.
How New Hampshire differs
New Hampshire's law is enacted but not yet in force; most of it takes effect January 1, 2027, with one building-code provision on a later contingent date. Notification is optional rather than required.
Compare plug-in solar rules by stateSB 540-FN; Chapter 262, Laws of 2026. Last checked August 28, 2026.
Also check landlord or HOA rules, local code, utility requirements outside this statute, and product instructions where relevant.