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Become an Approved Supplier

This section will help you become an approved Gas Energy Supplier, as well as provide additional information for our Gas Retail Access Program. There are three steps to becoming a gas supplier.

Please obtain approval from the following:

New York State Department of Public Service (PSC):Energy Supply Company Retail Access Application Instructions.

ESCO - Retail Access Application for Energy Supply Companies

Once you are approved by the PSC, please complete our tariff application form for either or both the NY or Long Island territories, along with the GTOP Seller Service agreement, two signed originals of the NAESB contract for the applicable territory, two signed originals of the Capacity Release Agreement for the appropriate territory, the NYS Department of Taxation and Finance Resale Certificate ST-120 for the appropriate territory, and a taxpayer W-9 form.

Once we receive these applications, the approval process to determine credit worthiness will begin.


*Note: please reach out to Greg Accardo prior to completing the forms for the most current versions as they change frequently.

Mail originals of the application, taxpayer form, and the Certification letter to:

National Grid
175 E Old Country Road
Hicksville, NY 11801

Attention: Greg Accardo
Customer Choice/Supplier Services
Telephone: (516) 545-5755

Once the application and creditworthiness requirement are satisfied you must complete EDI Phase III testing with the company.

You will be required to post a cash deposit based on the level of testing required which will accrue interest, and be refunded at the time of commencing retail sales in the Company's service territory. If, for any reason the ESCO fails to commence retail operations within three months of completing EDI testing, the deposit will be forfeited to the Company.

  • EDI Core Transactions only: $5,000
  • EDI Core Transaction and Single Bill Testing: $10,000

Please complete the following form:

EDI Pre-testing Request (doc) - Complete and Return via e-mail to the addresses listed above.

For additional information on EDI Data Dictionaries and Implementation guides you can refer to the following PSC link:

If you have any questions about completing these forms, please contact the representatives listed in Step Two.

Once the above steps are met, we will notify the PSC that you are eligible to participate in our Gas Retail Access program. Your name will also be added to our Energy Supplier list and website.

Billing services agreement:

If you are interested in having National Grid perform consolidated billing services, in addition to complying with the foregoing process, please print out the appropriate agreement form below as well as the appendix for the National Grid service territory in which you intend to participate: either or both KeySpan Gas East Corporation d/b/a National Grid (KEDLI Form) or The Brooklyn Union Gas Company d/b/a National Grid NY (KEDNY Form).

Please return three signed copies of the agreement form for the territories in which you seek approval. The attached Appendix A contains the Terms and Conditions for National Grid’s Purchase of Accounts Receivable Program for both territories and is incorporated by reference into both forms of agreement and should be printed out and kept for your records.

Upon receipt of the signed agreement(s) and fulfillment of all other program requirements, National Grid will return a fully executed agreement(s) to you.