Under Regulation 25 of S.I. No. 60 of 2005, which transposed Article 3(6) of the Electricity Directive (2003/54/EC), the Commission for Energy Regulation (CER) is required to ensure that all electricity suppliers provide reliable information on bills and promotional materials sent to customers regarding the contribution of each energy source to the overall fuel mix of the supplier concerned.
The latest CER figures (2010), on an all-island basis, show the following fuel mix for electricity generation; Gas 64%, Coal 16%, Renewables 12%, Peat 6% and Oil 2%. I have been informed by the CER that the 2011 fuel mix figures will be published shortly.
The sourcing, cost and quantity of the raw materials used for electricity generation is a commercial decision by each company. However, I can confirm that Coal, Oil and the majority of the gas are sourced internationally while renewables and peat are sourced domestically.