The 200 meter long, 7800 dwt ro-ro ferry Mecklenburg-Vorpommern allided with a quay at Rostock, Germany.   The ferry had lost power after an engine failure causing the allision.   A tug was requested and proceeded to help moor the Mecklenburg-Vorpommern back to dock.   No reports of injuries or pollution being released.  All passengers and vehicles were safely unloaded.   The ferry was pulled from service to allow an inspection of the vessel.