Tecogen Inc revenue for the last year amounted to 25.14 M USD, the most of which — 14.52 M USD — came from its highest performing source at the moment, Services, the year earlier bringing 12.06 M USD. The greatest contribution to the revenue figure was made by United States — last year it brought Tecogen Inc 25.14 M USD, and the year before that — 25.00 M USD.