Engineers funded by the EU have developed a prototype water-hydraulic power take-off (PTO) system as an environmentally friendly alternative to an oil-hydraulic system. Since it is water based, the PTO eliminates the risk of oil leaks into the marine environment.
The aim of the AQUAGEN (Development of cost-effective, water based power take-off system for marine energy applications) project was to create a more dependable, environmentally friendly PTO system.
Further details: Green alternative for hydraulic system