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National Grid Discount Rate Application. CODES (1 days ago) I receive benefits from the program(s) indicated and the National Grid residential account above is in my name, and I am income eligible. Signature Date Please mail or fax, your eligibility documentation: National Grid Accounts Processing, Massachusetts Discount Rate, Post Office Box 960, Northborough, MA 01532-9906 Fax: 877-388-9077
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