This BRE report provides information on trends relating to energy use and energy efficiency in Registered Social Landlord (RSL) homes. Its aim is to present as complete a picture as possible of the trends in energy use and energy efficiency in RSL homes from the mid-1980s to 2000. Although this report focuses on RSL homes, it draws comparisons with other tenures (primarily with owner-occupied homes) to illustrate important points. Tables, graphs and charts illustrate long-term trends.