"Information on the types of energy consumed in occupied New Zealand private dwellings is used for marketing research and to monitor changes, over time, in the energy types used by New Zealand households. It is an indicator of the habitability of houses, when used in conjunction with information on dampness and insulation levels and is an important variable in deriving the deprivation index. The information may also be combined with other variables to help forecast and plan energy requirements and distribution, enable natural resource accounting, and monitor trends in energy efficiency and conservation.
Energy Types Used in Private Dwellings is a hierarchical classification with 2 levels. It has nine categories at the highest level and 26 categories at the second level – excluding residual categories."