Onshore power supply (OPS) allows for electricity generated by visiting ships' diesel auxiliary engines to replaced by power that has been generated on shore. In this way, during docking periods, ports can substantially reduce production of harmful pollutants such as nitrogen oxide, sulphur oxide and diesel fine particulate matter. To a lesser extent, carbon dioxide (CO_2) can also be reduced. Switching to electric power can also help cut noise levels - a big plus for ports in city centres. New legislation requires all vessels berthing in European ports for more than two hours to burn marine gas oil with a sulphur content of less than 0.1 % in their auxiliary boilers, or use OPS.
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