Eversource Energy (Massachusetts) interconnection application

Documents Eversource Energy (Massachusetts) asks for

• Interconnection application formExhibit A Simplified Process application, signed by Interconnecting Customer Gridpol prepares this.
• UL 1741 / IEEE 1547 certificationInverter manufacturer UL 1741 listing documentation; UL 1741 SB required since Oct 1, 2023
• Single-line diagram (one-line)Electrical sketch/one-line; for Simplified does not need PE stamp (Eversource seminar); Expedited/Standard needs MA Electrical PE stamp Gridpol prepares this.
• Site plan / site layout (when applicable)Required for Expedited/Standard (plan view, lot lines, pole numbers, meters, title block; no PE stamp) Gridpol prepares this.
• Battery spec sheet (when applicable)Energy Storage Questionnaire/BESS sheet required for completeness when storage included
• Net metering / net billing agreement (when applicable)Schedule Z - net metering application, if net metering sought
• Other utility-specific document (when applicable)Exhibit H Retail Customer Agreement / Exhibit I Landowner Consent if applicable
• Final inspection sign-offCertificate of Completion signed by local wiring inspector

How the Eversource Energy (Massachusetts) process runs

1. (If new/upgraded service needed, request it first.) Installer submits Simplified Process application (Exhibit A) with supporting documents through the utility portal.
2. Utility acknowledges receipt within 3 business days; completeness determination within 10 business days.
3. Utility completes screens within 15 business days (20 if Screen 5 fails); total max 25 business days (30 with Screen 5 failure).
4. Utility countersigns application approval line = Conditional Approval to Interconnect (minor system modifications billed if needed).
5. Install facility; local electrical wiring inspector signs Certificate of Completion (installing electrical contractor also completes it).
6. Return Certificate of Completion (and completion documentation); utility may perform Witness Test within 10 business days or it is deemed waived.
7. Meter installation; utility issues Authorization to Interconnect within 5 business days after requirements met and meter installed. No parallel operation before Authorization to Interconnect.

Fees

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

Size levels and limits

Net metering classes: Class I <=60 kW, Class II 60-1,000 kW, Class III 1-2 MW.

Storage, EV and stamps

Common issues the utility lists

• Single-phase inverters on a three-phase service do not qualify for Simplified
• Application must be signed by Interconnecting Customer, show AC and DC size, voltage, phases, generator type, fault current; correct fee received (Eversource application checklist)
• Missing Energy Storage Questionnaire when storage included -> application not complete

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

Sources

• Eversource MA - Application to Interconnect: https://www.eversource.com/residential/about/doing-business-with-us/interconnections/massachusetts/massachusetts-application-to-interconnect (retrieved 2026-11-13)
• NSTAR Electric d/b/a Eversource - Standards for Interconnection of DG, M.D.P.U. No. 55G (eff. Aug 20, 2026): https://www.eversource.com/docs/default-source/rates-tariffs/mdpu-55a-interconnection-distributed-generation.pdf?sfvrsn=897b4555_4 (retrieved 2026-11-13)
• Eversource MA - Interconnection Resources: https://www.eversource.com/residential/about/doing-business-with-us/interconnections/massachusetts/massachusetts-application-to-interconnect/interconnection-resources (retrieved 2026-11-13)
• Eversource MA - DG Application Check List: https://www.eversource.com/docs/default-source/doing-business/dg-application-checklist.pdf?sfvrsn=41ac310f_2 (retrieved 2026-11-13)
• Eversource MA - Net Metering: https://www.eversource.com/residential/about/doing-business-with-us/interconnections/massachusetts/net-metering (retrieved 2026-11-13)