Earth Notes: General Bibliography (NEED2021)

• [NEED2021] Hiten Shah National Energy Efficiency Data-Framework (NEED): Summary of Analysis, Great Britain, 2021 (accessed 2022-01-25), UK BEIS, 2021-06-24, copyright UK Open Government Licence v3.0 (report) (BibTeX).
  abstract

  This report presents analysis of domestic energy consumption using the latest version of the National Energy Efficiency Data-Framework (NEED). The pattern of average consumption by household and property attributes remains broadly stable over time. Energy consumption (both gas and electricity) tends to be lower for smaller properties, and newer properties tend to consume less gas. The estimated median savings in gas consumption in 2019, from energy efficiency measures installed in England and Wales in 2018, ranges from 4 per cent for loft insulation to 18 per cent for solid wall insulation. Solar PV installations result in an estimated 14 per cent median saving in electricity consumption. While gas savings from cavity wall insulation remain stable in the 5 years following installation, the annual gas savings from both new condensing boilers and loft insulation decline by around 10 per cent over the first 5 years. The electricity savings from solar PV decline by around 20 per cent in the 5 years following installation. This analysis is based on the measures installed in England and Wales over the years 2011 to 2014 and may reflect changes in physical structures and occupant behaviour.
  note

  [Notes some decline in savings after installation of loft insulation and condensing boilers. Gas consumption increases strongly with floor area of home, but also with number of adults and age of property. Electricity use does not icrease with property age as not much used for space heat: "It is estimated that only 14 per cent of properties are off the gas grid and use non-gas fuel sources, including electricity to heat their homes." And "Detached properties tend to have the highest gas and electricity consumption, which partly reflects the fact that they tend be the largest properties (see Figures 2.5 and 2.6). As flats are generally the smallest properties, they tend to have the lowest gas and electricity consumption. In 2019 converted flats had a median gas consumption 28 per cent higher than purpose-built flats, despite the fact that both property types tend to be similar sizes. This reflects the fact that most converted flats are in dwellings originally built before 1919," see Figure 2.6. Owner-occupied homes tend to have the highest gas consumption, then privately rented, with council and housing association the lowest.]