We Have the Energy. You have the Power. EnergyMark is a local retail and wholesale supplier of natural gas and electricity, with over 85 years of combined experience. EnergyMark is known for its friendly customer service and its ability to offer the most competitive prices with a choice of rate plans that are customized to the individual needs of our customers. EnergyMark has more than 10,000 residential, commercial, and industrial customers throughout New York State and Northwestern Pennsylvania. We can supply natural gas and/or electricity to any customers served by National Fuel, National Grid, New York State Electric & Gas (NYSEG), and Rochester Gas & Electric (RGE). For more information, please visit www.energymarkllc.com or call our Main Street office in Williamsville at (716) 614-1800