Niagara Mohawk Power Corporation Declares Preferred Stock Dividends

SYRACUSE, NY--(Marketwired - Mar 1, 2016) - 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 January 1, 2016 to March 31, 2016 at the following rates for all outstanding series of its preferred stock:

• .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 March 31, 2016, to holders of record on March 17, 2016.

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 Massachusetts, New York, and Rhode Island. It is the largest distributor of natural gas in the northeastern U.S., serving approximately 3.4 million customers in Massachusetts, New York, and Rhode Island.

About National Grid
National Grid (LSE: NG) (NYSE: NGG) is an electricity and natural gas delivery company that connects nearly 7 million customers to vital energy sources through its networks in New York, Massachusetts and Rhode Island. It is the largest distributor of natural gas in the Northeast. National Grid also operates the systems that deliver gas and electricity across Great Britain. Through its U.S. Connect21 strategy, National Grid is transforming its electricity and natural gas networks to support the 21st century digital economy with smarter, cleaner, and more resilient energy solutions. Connect21 is vital to our communities' long-term economic and environmental health and aligns with regulatory initiatives in New York (REV: Reforming the Energy Vision) and Massachusetts (Grid Modernization). For more information please visit our website: www.nationalgridus.com, or our Connecting website. You can also follow us on Twitter, watch us on YouTube, Like us on Facebook and find our photos on Instagram.