These data are based on the number of new dwellings connected by the ESB to the electricity supply but exclude conversions and demountables. They may not accord precisely with local authority boundaries. The classification used for "type of dwelling" up to 2004, is no longer available. Data after 2004 is available on the website. The most current data is published on these sheets. Previously published data may be subject to revision. Any change from the originally published data will be highlighted by a comment on the cell in question. These comments will be maintained for at least a year after the date of the value change.