42°01′12″N 87°55′21″W / 42.01995°N 87.92241°W / 42.01995; -87.92241 The Gas Technology Institute (GTI) is an American non-profit research and development organization which develops, demonstrates, and licenses new energy technologies for private and public clients, with a particular focus on the natural gas industry. GTI is located in Des Plaines, Illinois.