Optimizing cost effectiveness of OPS
The cost effectiveness of environmental measures is given by the ratio between their costs and benefits, the latter expressed in terms of avoided emissions. This yardstick allows different measures to be compared.
In the case of OPS, cost effectiveness can be improved by taking measures to reduce costs and/or by opting for cleaner electricity. A few examples:
The greater the number of hours an OPS system is used per year, the lower the costs per unit of pollutant emitted. A doubling of the number of hours at berth would increase cost effectiveness by roughly a factor 2.
If no frequency converter is needed, investments costs may be an estimated 10 % to 30 % lower, depending on the local situation.
If high-voltage power is available, the investment costs per berth will be much lower, as high-voltage supply generally requires significant investments.
By reducing onboard power consumption, both operational costs and investment costs can be saved.
A broader option would be not to equip entire terminals with OPS, but to restrict it to a limited number of berths and ensure these berths have high occupancy.