Steven L. Zelkowitz

National Grid IGTS Corp. sells solar water heating systems. The firm offers energy-saving devices, solar energy systems, and high-efficiency gas heating equipment for home use. The company is headquartered in Hicksville, NY.

KeySpan Corp. distributes natural gas. It also provides electricity and other energy services. The firm manage a portfolio of service companies and strategic investments in natural gas exploration, production, pipeline transportation, distribution, storage and Canadian gas processing. The company was founded in 1895 and is headquartered in Brooklyn, NY.

Williams Pipeline Partners LP owns and operates natural gas transportation & storage assets. It owns a 35% interest in Northwest Pipeline GP, which owns and operates a natural gas pipeline system that extends from the San Juan Basin in northwestern New Mexico & southwestern Colorado through Colorado, Utah, Wyoming, Idaho, Oregon, and Washington. The frim operates through its subsidaries Williams Pipeline GP LLC and Williams Partners L.P. The company is headquartered in Tulsa, OK.

Part of The Williams Cos., Inc., Williams Pipeline GP LLC is a company that provides investment services. The company is based in Tulsa, OK.