The regular public transport DunajBus might cause an actual decrease of number of vehicles on the roads by 1.500 cars a day; this fact itself represents an important contribution towards the environmental sustainability. At the Danube Transport Day, The European Commission has encouraged stakeholders to put a substantial effort into finding environmental-friendly transport solutions in accordance to the EÚ commitment to decreasing the emissions. That means to exploit engine solutions as an alternative to traditional diesel propulsion. In order to achieve this goal Prodanubia has organized several foreign missions, visiting e.g. the Echandia Marine in Swedish Stockholm – an important innovator in electric marine propulsion technology and expert in the electric ferry systems of the future. The Echandia Marine has been the first to develop a prototype of fast passenger electric ferry. Results of prototype testing co-funded by a European program represent an important milestone in the process of obtaining a reliable solution of eco-friendly propulsion. Several alternative technologies are currently being tested; hopefully Dunajbus will be the first complex waterborne transport system in the world to use an environmentally friendly propulsion alternative.