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The development of an 110kV substation at the former Mitsui Denman site. The proposed substation will comprise of: a two-storey Gas Insulated Switcher (GIS) 110/20kV substation building, an associated single storey Gas Insulated Switchgear (GIS) 20kV substation building, associated outdoor electrical equipment, including filter banks, transformers, cable sealing ends and surge arresters, two number lightning protection masts (12.5 metres in height), associated internal access road, boundary treatment including substation perimeter fencing and all ancillary site development works. Construction of two number 110kV underground cable ducts between the proposed substation and the existing Eirgrid 110kV substation to the North in Wallingstown. The site area of the proposed substation is approximately 0.60ha. The proposed substation is to support development in the Wallingstown area in Little Island. - Extension of duration of permission granted under planning reference: 16/5606.