Member profile NYSEG Share: Utilities NYSEG Visit Website 1387 Dryden Rd. Ithaca, NY 14850-8810 (607) 762-6298 (607) 347-2760 (fax) About Rep Info About NYSEG, a subsidiary of Energy East Corporation, serves 838,000 electricity customers and 250,000 natural gas customers across more than 40% of upstate New York. For more information about NYSEG, visit www.nyseg.com. Whom to Contact Gavin Mosley