NHEC (New Hampshire Electric Co-op) interconnection application

Documents NHEC (New Hampshire Electric Co-op) asks for

• Interconnection application formOnline Interconnection Application (solar, solar+battery, battery only); equipment data incl. NHEC pole number; UL 1741 SA inverters per IEEE 1547-2018 Gridpol prepares this.
• Single-line diagram (one-line)One-line drawing required for all interconnection-facilities and battery/backup installations; show exterior production meter socket, utility-accessible disconnect, 'line to solar - load to utility' Gridpol prepares this.
• Battery spec sheet (when applicable)Battery section: manufacturer/model/qty, kW/kVA, kWh, UL 1741 SA/SB listing, grid charging, off-grid/backup operation, switching
• Interconnection agreementMutual Indemnity Agreement (T&C X / NH PUC 904.03) accepted in the form
• Other utility-specific documentRenewable Energy Certificate Member Agreement - choose option (e.g. keep RECs with monitoring fee, give to NHEC, sell to NHEC)
• Final inspection sign-offAfter install: local building inspector (or NH licensed electrician if none) signs the Interconnection Application for code compliance
• Other utility-specific documentWitness test: load-break test (generator shuts down within 2 s) performed by member/contractor and signed on the application

How the NHEC (New Hampshire Electric Co-op) process runs

1. Optional pre-application review; finalize design with installer; read T&C Section X and Schedule of Rates/Fees
2. Submit online Solar & Battery Interconnection Application with one-line drawing, REC agreement and indemnity; pay application fee
3. NHEC completeness review within 20 business days; queue number assigned; system modifications estimated and prepaid if needed
4. NHEC notifies application complete - install (exterior production meter socket at 66 in., utility-accessible disconnect, placards)
5. Local building inspector (or NH licensed electrician) signs application; contractor performs load-break witness test and signs
6. NHEC inspection; if passed NHEC installs meters and signs application authorizing operation (copy to member)

Fees

Utility fees are paid by the installer or customer; they are not part of the Gridpol plan.

Size levels and limits

NHEC T&C Section X

Storage, EV and stamps

Common issues the utility lists

• Application without one-line diagram will not be accepted
• Incomplete application (NHEC states missing items in writing)
• Production meter not 66 in. above grade or within 10 ft of LP gas regulators/tanks
• Missing/incorrect placards (red background, white lettering) on net and production meters
• No exterior utility-accessible disconnect at production meter
• Wrong wiring: solar must be on line side (top), grid/panel on load side (bottom)
• Load-break test fails (no shutdown within 2 s)
• Increase of AC inverter rating after application (loses queue position)

Gridpol’s pre-submission check covers these before we file.

Sources

• NHEC Solar & Net Metering: https://www.nhec.com/solar-net-metering/ (retrieved 2026-11-13)
• NHEC Solar & Battery Interconnection Application (online form): https://smarthub.tfaforms.net/1513 (retrieved 2026-11-13)
• NHEC Terms & Conditions, Section X Net Metering: https://www.nhec.com/terms-and-conditions/ (retrieved 2026-11-13)
• NHEC Schedule of Fees effective Jan 1, 2026: https://www.nhec.com/wp-content/uploads/2025/10/Schedule_of_Fees_20260101.pdf (retrieved 2026-11-13)
• NHEC Solar Interconnection - Avoid These Common Mistakes: https://www.nhec.com/wp-content/uploads/2025/03/Avoid-These-Common-Mistakes.pdf (retrieved 2026-11-13)