The development will consist of revisions to parent permission FCC Reg. Ref. FW20A/0087 to include the following: Alterations to plant areas at second/third floor level of the permitted DB5x data hall (formerly known as Building No. 3). The plant areas are now located externally but remain below the permitted parapet height. No visible elevational changes to DB5X. No changes to permitted DB6x and DB7x data halls (formerly known as Building Nos. 1 and 2) and the rotunda building. Removal of the permitted MV generator building and removal of 7 no permitted car parking spaces and replacement with a proposed gas generator compound comprising 9 no. gas generators enclosed with external screening of c.11m high with 9 no associated flues 0.18m high; provision of 1 no. switchroom building comprising electrical rooms and a control station at ground floor level (c.478sqm at c.6m high) and air compressor (c.38sqm at C.4.5m high); Revisions and reduction in the number of fuel tanks from 12 no. permitted fuel tanks to 6 no. proposed fuel tanks within a fuel compound (c.12m high, c.10m from project datum) and relocation and revisions to the permitted fuel pumphouse c.41sqm; Removal of the permitted skip compactor and bin store and provision of a proposed AGI Compound comprising the following: AGI Buildings 1 and 2 (total floor area c.106sqm, c.4.5m high each) with a proposed service entrance/access from the estate road; Relocation of 2 no. permitted transformers within a concrete enclosure (without roof) at 8m high to the north of the proposed AGI Compound. Provision of 2 no. smaller transformers and load bank (c.29sqm); Increase in height of the 7 no. permitted water tanks to c.18m high; Relocation and revisions to the permitted heat recovery plant room (C.48sqm) and slight relocation of the permitted sprinkler pump room (c.32sqm). No changes to the permitted salt saturators, sprinkler tanks and water treatment room c.228sqm; Reconfiguration of the permitted car parking layout providing a total of 52 no. car spaces reduced from 59 no. car spaces previously permitted. Provision of an additional bike shelter serving 10 no. bicycle spaces. Internal access road enlarged locally at the entrance to the permitted rotunda/front of house building; All associated site development works, services provision, drainage works, minor amendments to landscaping and associated boundary treatment works. No works are proposed to the existing telecommunication pylon and overhead lines running diagonally through the site from south west to north east; The total gross internal floor area of the development including data halls and ancillary structures is reduced to C.19,040 sqm from c.25,225 sqm under FCC Reg. Ref. FW20A/0087; All other development as permitted under FCC Reg. Ref. FW20A/0087; A permitted 110kv substation located to the south east of this site was subject of a separate Strategic Infrastructure Development application to An Bord Pleanála (ABP Ref. 307296-20) under section 182A of the Planning and Development Act 2000 (as amended).