National Grid
Screening Process

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 have not already visited it, please refer to the Expedited Application page before proceeding.

In the Expedited Process, once the Interconnecting Customer has been notified that its distributed generation (DG) Interconnection Application (IA) has been deemed complete (i.e. all application materials are accounted for), National Grid shall direct the Interconnecting Customer (and its representatives) through the following process:
  1. A National Grid Technical Support Consultant (in the Technical Sales & Engineering Support department – part of the Distributed Generation Services (DGS) group) will conduct an initial technical review screening. This initial technical review screening generally includes:
    1. A review of the local and area National Grid Electric Power System (EPS)
    2. A review of the proposed DG design diagrams and other IA materials
    3. An identification of any missing or deficient customer documentation or EPS information
    4. An identification of obvious regulatory or code infractions based on a comparison of the proposed DG design diagrams and the National Grid EPS
    5. Answers to screening questions (as per “Figure 1 – Schematic of Massachusetts DG Interconnection Process” and the accompanying notes provided in the Interconnection Tariff)
  2. Once the Technical Support Consultant has completed its initial technical review screening, National Grid will provide the Interconnecting Customer with a Screening Memo.
    1. If the proposed DG design diagrams result in the IA passing all of the screening questions, National Grid will offer a Conditional Approval to the Interconnecting Customer along with the Screening Memo. (Visit the Conditional Approval page to view the next step of the process.)
    2. If the proposed DG design diagrams result in the IA failing the screening questions, National Grid will offer the Interconnecting Customer an Exhibit D – Supplemental Review Agreement along with the Screening Memo.

    Note 1: In some cases, where extremely minor National Grid EPS system modifications are required (and the IA would otherwise pass the screening questions), National Grid may opt to waive its right to require a Supplemental Review. In such instances, Interconnecting Customers will be provided additional guidance in the Screening Memo about how to proceed.

  3. In the case where National Grid provides an Exhibit D – Supplemental Review Agreement, if the Interconnecting Customer wishes to proceed with the Supplemental Review:
    1. The Interconnecting Customer signs and returns the Exhibit D.
    2. Upon the receipt of a signed Exhibit D, National Grid will prepare and issue an invoice (as indicated on the Legal Information Document).
    3. The Interconnecting Customer pays the invoiced cost in full.
    4. The Interconnecting Customer may be required to provide additional information, documentation, and/or corrections (as identified in the Screening Memo) before proceeding.
    5. Upon receipt of the full payment (and all necessary revised documentation), National Grid will initiate the Supplemental Review.
  4. Once the Supplemental Review is initiated, a Technical Support Consultant will coordinate with an Interconnection Engineer (in the Retail Connections Engineering department – part of the DGS group) and any other necessary engineering resources to conduct the Supplemental Review. The Supplemental Review generally includes:
    1. A quick review of the information provided in the Screening Memo
    2. Answers to the Supplemental Review Screens (as per “Figure 1 – Schematic of Massachusetts DG Interconnection Process” and the accompanying notes provided in Interconnection Tariff)
    3. An identification of possible design diagram changes that may allow the IA to pass the Supplemental Review Screens (if applicable)
  5. Once the Interconnection Engineer has completed the Supplemental Review, National Grid will provide the Interconnecting Customer with a Supplemental Review Memo.
    1. If the proposed DG design diagrams result in the IA passing all of the Supplemental Review Screens, National Grid will offer a Conditional Approval to the Interconnecting Customer along with the Supplemental Review Memo. (Visit the Conditional Approval page to view the next step of the process.)
    2. If the proposed DG design diagrams result in the IA failing the Supplemental Review Screens, National Grid will offer the Interconnecting Customer:
      1. Options to address the failed Supplemental Review Screens (if applicable, refer to guidance in the Supplemental Review Memo)
      2. An executable Exhibit E – Impact Study Agreement, including a cost estimate and anticipated timeline for the Impact Study
  6. In the case where National Grid provides an Exhibit E – Impact Study Agreement, if the Interconnecting Customer wishes to proceed with the Impact Study:
    1. The Interconnecting Customer signs and returns the Exhibit E.
    2. Upon the receipt of a signed Exhibit E, National Grid will prepare and issue an invoice (as per the payment terms offered in the Exhibit E and as indicated on the Legal Information Document).
    3. The Interconnecting Customer pays the invoiced cost in full.
    4. The Interconnecting Customer may be required to provide additional information, documentation, and/or corrections (as identified in the Supplemental Review Memo) before proceeding.
    5. Upon receipt of the payment (and all necessary revised documentation), National Grid will initiate the Impact Study. (Visit the Study Process page to view the next step of the process.)

    Note 2: In the event that the Interconnecting Customer signs and returns an Exhibit E, the interconnection application will be transferred from the Expedited Process to the Standard Process. For the remainder of the application process, the interconnection application will be considered a Standard Process application.

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.