To ask the Scottish Executive what strategies have been introduced to reduce fuel burn and emissions across the CalMac, Cowal and Northlink Ferries Ltd fleets and how successful these strategies have been.
CalMac Ferries Ltd
CalMac Ferries Ltd has commissioned a carbon footprint study to identify options to reduce carbon dioxide (CO2) emissions from its operations.
The objectives of this project were to:
1. Calculate a carbon footprint of CalMac''s shipping and onshore activities
2. Identify potential options for reducing CO2 emissions from CalMac''s shipping and onshore activities
3. Assess the feasibility of options in light of CalMac''s operational restraints
4. Recommend the next steps to reduce CalMac''s carbon footprint.
The programme has commenced with plans to change the propeller blade types on four of the ships from the major vessel fleet which is calculated to reduce fuel and save 2000 tonnes of CO2 per year.
The project is ongoing.
NorthLink Ferries Ltd
Hamnavoe was converted to allow the main engines to run on 40cSt (centiStokes) fuel instead of the more expensive Marine gas oil (MGO).
This change of fuel type is on track to deliver significant benefits in terms of lower fuel costs and lower fuel volume consumption given the higher energy content.
Hascosay and Clare were both moved from MGO to lower cost 40cSt which also has a higher energy content.
In 2010 Hildasay replaced Hascosay and this vessel operates on 220cSt fuel.
Hjaltland and Hrossey are designed to minimize the fuel used for the different design speeds. An example of this is the ability to run on one or two engines through a single propeller with the second propeller fully feathered and stopped with two of the blades aligned with the propeller shaft A-frame “ hence minimizing the underwater drag.
In 2009 NorthLink replaced the underwater antifouling paint on Hjaltland and Hrossey with a newer Teflon type product which has an improved environmental action and which through reduced drag reduces the volumes of fuel used. Indications to date suggest that the percentage fuel volume saving claimed by the paint manufacturers is being exceeded.
Shore procedures have been tightened to ensure that vessels are able to depart quickly after the last check-in time and maximize the time available for a crossing. This ensures the minimum engine power and fuel consumption is used to achieve an on time arrival.