Eversource NH solar: going solar with New Hampshire's main utility in 2026

Eversource Energy (operating as Eversource New Hampshire, the former Public Service of New Hampshire or PSNH) is the primary electric utility serving most of New Hampshire's residential solar customers. Understanding how Eversource NH handles solar interconnection and net metering is essential before you sign an installation contract in the state. This guide covers the complete picture: who the utility is, how your net metering credits are calculated and billed, and how to navigate the interconnection process from application to permission to operate.

Who is Eversource New Hampshire?

Eversource Energy is a publicly traded New England utility holding company that also operates in Massachusetts and Connecticut. In New Hampshire, Eversource operates as the state's largest electric utility, serving roughly 500,000 customers across much of the state. The company assumed the PSNH brand following its acquisition and operates under the Eversource name today. If your NH electric bill says Eversource or PSNH, this guide applies to you. Other NH utilities include Unitil (serving parts of southern NH near the Massachusetts border) and the New Hampshire Electric Cooperative (NHEC), a member-owned cooperative serving rural parts of the state.

How Eversource NH net metering works

Under New Hampshire's net metering law (RSA 362-A:9), Eversource must offer residential solar owners full retail-rate credits for excess generation. The mechanics: your solar system connects to the Eversource grid through a bi-directional meter that measures both what you consume from the grid and what you export. Monthly, Eversource credits excess exports at your retail electricity rate — approximately $0.22 to $0.26 per kilowatt-hour in 2026 depending on your rate class. Credits reduce your current month's bill; any remaining credits carry forward to the following month.

NH does not have mandatory time-of-use rates for most residential customers, so your net metering credit rate is the same regardless of when your panels produce. This simplifies the payback math considerably compared to states with complex time-varying credit structures.

Eversource NH interconnection process step by step

Step 1 — Application. Your installer submits an interconnection application to Eversource NH that includes system specifications, single-line electrical diagrams, and your account information. For residential systems under 100 kW, NH uses a simplified interconnection track.

Step 2 — Technical review. Eversource engineers review the application for technical compliance with NH interconnection standards. Most residential applications pass quickly; complex situations may require additional review.

Step 3 — Interconnection agreement. Eversource issues an interconnection agreement that specifies your net metering credit rate, billing arrangement, and program terms. Read it before signing, particularly how year-end surplus credits are handled.

Step 4 — Installation and inspection. Your installer completes the system. Eversource or a certified inspector verifies the installation meets standards.

Step 5 — Bi-directional meter and PTO. Eversource installs or activates a bi-directional meter and issues permission to operate. Net metering begins. Total typical timeline: 6 to 10 weeks.

Unitil and NHEC: other NH utilities

Unitil serves portions of southern New Hampshire near the Massachusetts border, including parts of Nashua and surrounding communities. Unitil also offers full retail-rate net metering under NH law, with its own interconnection application process that parallels Eversource's. The New Hampshire Electric Cooperative (NHEC) serves rural parts of central and northern NH. NHEC's net metering program operates under cooperative board policy rather than state investor-owned utility rules; contact NHEC directly for current terms, credit rates, and the interconnection process specific to cooperative members.