A

Under “General information”, data can be entered on how frequently ships are berthed and for how long. These data are needed to calculate operational costs and emission changes.

B

Depreciation period and interest rate affect annual costs, with higher interest rates and shorter depreciation periods leading to higher annual costs. 

C

Here the investments costs at the terminal can be filled in. The tool distinguishes various cost categories, which are summed to yield the total investment costs. Annual costs are calculated using the interest rate and depreciation period. Investment costs are not relevant for the auxiliary engines, as these are vital outside the ports.

D

In this section the shipside investments costs are filled in. A range of cost categories are listed, which are summed to yield the total investment costs. Annual costs are calculated using the interest rate and depreciation period.

E

The operational costs depend on fuel and electricity consumption levels, fuel and electricity prices and electricity taxes. From these data, annual costs are calculated. Savings on auxiliary engine maintenance costs can be filled in here, with negative costs standing for benefits. The total benefits are calculated from the number of hours at berth, as input to the General information section. There is an option to calculate with a CO₂ price in advance. This option enables simulation of the influence of inclusion of the Maritime industry in the EU ETS on the cost effectiveness of OPS.

F

The total annual costs are calculated by summing the various cost categories under B to F. The costs or benefits accruing from using OPS can be calculated by comparing the ‘auxiliary engine costs’ with the ‘OPS costs’ (row 65), the outcome of which is presented in Box I.

G

The emission benefits are calculated by using emission factors from the data section and total annual consumption figures. Total annual consumption is calculated on the basis of the ships’ consumption and the number and duration of port calls. The emission benefits can be found by comparing the figures in rows 76-80. The type of fuel can be changed from diesel to HFO here, as well as the energy source used for power generation (by clicking on a pull-down menu)

H

The total annual costs can be calculated by subtracting the ‘auxiliary engine costs’ from the ‘OPS costs’. Negative costs mean that OPS yields a financial benefit. The cost effectiveness is expressed in Euro per unit of pollution. Pollution units are used to sum the various air pollutants, with SO₂ and PM being judged to be 2.2 and 12.8 times more harmful on the basis of a study by AEA Technology (2005).

I

For each pollutant the relative emission reduction is calculated using the figures in rows 76-80.