NIAGARA MOHAWK POWER CORPORATION DECLARES PREFERRED STOCK DIVIDENDS

SYRACUSE, N.Y., Nov. 20, 2023

• .85% on the $100 par value, 3.40% Series;
• .90% on the $100 par value, 3.60% Series;
• .975% on the $100 par value, 3.90% Series.

The preferred stock dividends are payable on December 29, 2023 – December 31 falls on a weekend, therefore the payment date is moved -- to holders of record on December 18, 2023.

The Company, doing business as National Grid, provides electricity service to approximately 1.6 million customers and natural gas service to approximately 565,000 customers in upstate New York. The Company is based in Syracuse, N.Y.

National Grid is an indirect subsidiary of National Grid plc (LSE: NG; NYSE:NGG). National Grid delivers electricity to approximately 3.3 million customers in New York and New England. It is the largest distributor of natural gas in the northeastern U.S., serving approximately 3.4 million customers in New York and New England.

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SOURCE Niagara Mohawk Power Corp.