Earthquakes in New England? No, it's deregulation and acquisitions that have altered the energy landscape. National Grid USA's five utility subsidiaries deliver electricity to 3.5 million customers in a 29,000-sq.-mi. service area in Massachusetts, New York, and Rhode Island. It transmits electricity across almost 8,920 miles of high-voltage lines in New England and New York. The company is also the region's largest distributor of natural gas with about 3.6 million customers. National Grid USA is a subsidiary of UK-based electricity and gas transmission company National Grid.