AIDA Cruises is looking to help preserve Rostock, Germany's natural environment with every trip it makes to the popular cruise destination.

Carnival Corp's German brand has signed a letter of intent with officials from the city and the state of Mecklenburg-West Pomerania to build an on-shore power plant for its incoming passengerships.

"Cruise tourism is of particular significance to Mecklenburg-Western Pomerania," state prime minister Manuela Schwesig said.