NIAGARA MOHAWK POWER CORPORATION DECLARES PREFERRED STOCK DIVIDENDS PR Newswire SYRACUSE, N.Y., Aug. 16, 2023 SYRACUSE, N.Y. , Aug. 16, 2023 /PRNewswire/ -- Niagara Mohawk Power Corp. (the "Company"), an indirect subsidiary of National Grid USA ("National Grid"), announced that its Board of Directors has declared dividends for the period July 1, 2023 through September 30, 2023 at the following rates for all outstanding series of its preferred stock: .85% on the $100 par value, 3.40% Series; .90%...