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In a bid to further reduce emissions such as NOx and SOx, Antwerp Port Authority has announced that it is to reward 'clean ships' calling at the port from next month.

Following a decision made by the port authority’s board of directors, the most environmentally friendly ships will be granted a discount of 10 percent on tonnage dues from 1st July 2011.

The new measure follows on from an initiative launched by the International Association of Ports and Harbours (IAPH), in which the port authorities of Le Havre, Bremen, Hamburg, Rotterdam, Amsterdam and Antwerp introduced the Environmental Ship Index (ESI).

To participate in the ESI, shipping companies are required to register their ships at www.environmentalshipindex.org. On the basis of the data entered, such as fuel consumption and emissions, each ship is given a score on a scale from 0 to 100 (from highly polluting to emission-free).

So far more than 250 ships have been given a score. The ports themselves decide what advantages to offer participating ships.

In the case of Antwerp, seagoing ships with a score of 31 or more will be granted a discount of 10 percent on the tonnage dues. The port authority will guarantee this discount for a period of at least three years, thus offering continuity for shipping companies that invest in improving the ESI score of their ships.

If fewer than 25 seagoing ships qualify for the discount, then the port authority will reward the 25 vessels with the highest ESI score. This latter measure applies until the end of 2011 and has been introduced to encourage shipping companies to register their vessels for the index.

The ships that qualify for a discount will be determined every three months on the basis of an update of the ESI. The port authority will then make the discount available retroactively for the past quarter. For example, the ESI for seagoing ships calling at Antwerp during the period 1 April to 30 June will be determined on 1 July.

The introduction of the ESI forms part of the port authority’s policy of sustainable development of the port. Antwerp Port Authority uses low sulphur fuel for its own fleet. In addition, ships and barges are able to use onshore power supplies at various locations in the port, so they do not need to run their engines while at berth.