National Grid
Conditional Approval

The information contained or referred to herein is for reference purposes only, and shall not be relied upon for any purposes. The user of this webpage should independently verify all information before proceeding forward with any project.

If you are looking for information about preparing a new application, please refer to the Pre-Application Process page.

The information on this page only applies to distributed generation (DG) Interconnection Applications (IA) considered under the Expedited Process or the Standard Process. For information about other IA’s please refer to the Simplified Application page.
  1. Once all required reviews and studies for an IA are complete, National Grid’s Distributed Generation Services (DGS) group will draft an executable Interconnection Service Agreement (ISA) based on the results of the required reviews and studies. As per the Interconnection Tariff, the ISA will generally include:
    1. A description of the customer’s proposed DG system and National Grid’s Electric Power System (EPS)
    2. Any special operating requirements for the customer
    3. A description of required EPS System Modifications (e.g. upgrades to the existing electric service)
    4. An estimated cost & estimated timeline for National Grid construction (if applicable)

    Note 1: The information and requirements provided in the Interconnection Service Agreement (ISA) will vary depending on the level of review or study that was required by the Interconnection Tariff, the configuration of the customer’s proposal, and the existing National Grid Electric Power System (EPS).

  2. The Conditional Approval email will include the following:
    1. The most recent technical findings document (e.g. screening memo)
    2. The executable ISA, which includes:
      1. Exhibit G – Interconnection Service Agreement (including any attachments)
      2. Exhibit H – Retail Customer Agreement (if applicable)
    3. A checklist of pending Completion Documentation

    Note 2: The Exhibit H must be submitted in any instance where the owner and/or operator of the DG system is not the named responsible party on the host retail electric billing account (also known as the “Host Customer” or “Retail Customer”).


  3. Once National Grid issues the Conditional Approval, the Interconnecting Customer must respond in a timely manner (as per applicable time frames in the Interconnection Tariff).
    1. If the Interconnecting Customer does not agree with the terms, conditions, and attachments of the executable Interconnection Service Agreement (or the results in the technical findings document), please refer to the appropriate process section in the Interconnection Tariff.
    2. If the Interconnecting Customer agrees with the terms, conditions, and attachments of the executable Interconnection Service Agreement, the Interconnecting Customer must promptly return the signed, dated, and initialed Interconnection Service Agreement (including the Exhibit H, if applicable).
  4. Once National Grid receives the signed ISA, National Grid will:
    1. Issue an invoice for the EPS System Modification costs based on the payment terms of the ISA and the Interconnection Tariff (if applicable)
    2. Execute the ISA and return it to the Interconnecting Customer.
    3. Proceed with its obligations to interconnect the Interconnecting Customer’s DG system based on the terms and conditions of the ISA and the Interconnection Tariff.

    Note 3: The Massachusetts DPU has implemented a new system for determining and tracking Net Metering eligibility. Refer to the Net Metering webpage for more information regarding the MassACA system of assurance. It is the responsibility of the Interconnecting Customer to secure a Net Metering cap allocation (if applicable) prior to National Grid offering Net Metering Services to the host billing account.

  5. Once the Interconnecting Customer submits the signed ISA, it should proceed with the construction of its DG system and work to meet its other obligations based on the terms and conditions of the ISA and the Interconnection Tariff. (Visit the Construction Process page to view the next step of the process.)
Please refer to the Interconnection Documents webpage for a list of all relevant interconnection process documents.

Please refer to the Interconnection Process webpage for a high-level overview of the distributed generation (DG) interconnection process.

Contact E-mail: Distributed.Generation@nationalgrid.com

DISCLAIMER: All content and information provided on this ‘process’ webpage, including links to other National Grid webpages or documents and all of the content and information provided therein, is solely to provide customers, contractors, and other parties with additional useful guidance regarding National Grid’s typical distributed generation interconnection process and matters related thereto. In all instances, the content and information provided by National Grid is superseded by the applicable laws, rules, regulations, tariffs, and regulatory decisions governing the distributed generation interconnection process and all matters related thereto in the relevant jurisdictions, all as may be amended from time to time. The content and information contained herein is not intended to be all inclusive of every process or action available to users with respect to the interconnection of distributed generation. It is the sole responsibility of users of this website to independently verify the process to interconnect its distributed generation, as well as the status of any changes, pending changes, or updates to the process described herein. National Grid shall not be held liable under any circumstances for any errors, omissions, inaccurate, and/or out-dated content or information provided herein.