Tecogen Inc. (TGEN)

Tecogen Inc. is a manufacturer of clean energy equipment based in Waltham, Massachusetts. The company designs, builds, installs and services natural gas-powered systems that produce electricity, heating, cooling and hot water on site for commercial, institutional and industrial customers.

Its products include combined heat and power cogeneration units, Tecochill natural gas engine-driven chillers, and Tecopower and InVerde inverter-based cogeneration systems. These systems are designed to lower energy costs and emissions by capturing waste heat and reducing reliance on the electric grid. The company has also developed Ultera emissions control technology for gas engines.

Tecogen's customers include hospitals, schools, apartment buildings, hotels, recreational facilities, indoor agricultural operations and manufacturers. A significant part of its business comes from long-term maintenance and service contracts on its installed equipment. Its common stock trades on NYSE American under the ticker TGEN.