30th Street Heliport, a privately owned heliport owned by the Hudson River Park Trust. US Helicopter offered regularly scheduled helicopter service connecting the Downtown Manhattan Heliport with John F. Kennedy International Airport in Queens and Newark Liberty International Airport in New Jersey, before going out of business in 2009. Utilities Gas and electric service is provided by Consolidated Edison to all of Manhattan. Con Edison's electric business traces its roots back to Thomas Edison's Edison Electric Illuminating Company, the first investor-owned electric utility. The company started service on September 4, 1882, using one generator to provide 110 volts direct current (DC) to 59 customers with 800 light bulbs, in a one-square-mile area of Lower Manhattan from his Pearl Street Station. Con Edison operates the world's largest district steam system, which consists of of steam pipes, providing steam for heating, hot water, and air conditioning by some 1,800 Manhattan customers. Cable service is provided by Time Warner Cable and telephone service is provided by Verizon Communications, although AT&T is available as well. Manhattan witnessed the doubling of the natural gas supply delivered to the borough when a new gas pipeline opened on November 1, 2013. The New York City Department of Sanitation is responsible for garbage removal. The bulk of the city's trash ultimately is disposed at mega-dumps in Pennsylvania, Virginia, South Carolina and Ohio (via transfer stations in New Jersey, Brooklyn and Queens) since the 2001 closure of the Fresh Kills Landfill on Staten Island. A small amount of trash processed at transfer sites in New Jersey is sometimes incinerated at waste-to-energy facilities. Like New York City, New Jersey and much of Greater New York relies on exporting its trash to far-flung areas. New York City has the largest clean-air diesel-hybrid and compressed natural gas bus fleet, which also operates in Manhattan, in the country. It also has some of the first hybrid taxis, most of which operate in Manhattan. Health care There are many hospitals in Manhattan, including two of the 25 largest in the United States (as of 2017): Bellevue Hospital Lenox Hill Hospital Lower Manhattan Hospital Metropolitan Hospital Center Mount Sinai Beth Israel Hospital Mount Sinai Hospital NewYork–Presbyterian Hospital NYC Health + Hospitals/Harlem NYU Langone Medical Center Water purity and availability New York City is supplied with drinking water by the protected Catskill Mountains watershed. As a result of the watershed's integrity and undisturbed natural water filtration