# Theta Motoren GmbH > Theta Motoren GmbH (Aachen, Germany) develops the Arcual opposed-piston engine combined with an axial generator - a compact, multi-fuel electric power generator for decentralized, hydrogen-ready power generation and backup systems. ## Pages - [About / Home](https://www.thetamotoren.de/): Overview of the Arcual opposed-piston engine and axial generator technology. - [Technical Data](https://www.thetamotoren.de/technical-data/): Engine specifications - 750 cc displacement, 20 kW power output, multi-fuel operation (incl. hydrogen and diesel). - [Applications](https://www.thetamotoren.de/applications/): Diesel generator substitution, backup power, distributed power, combined heat & power, mobility & cooling logistics. - [Team](https://www.thetamotoren.de/team/): The team behind Theta Motoren GmbH. - [Contact](https://www.thetamotoren.de/contact/): Contact form and company details. ## Contact - Email: info@thetamotoren.de - Address: Juelicher Str. 72a, 52070 Aachen, Germany