Energy efficiency regulation / greenhouse gas emissions / electricity market / energy intensity / electricity operators / electricity / energy consumption / retail energy suppliers / electricity generation / electricity suppliers / finance operations / gas branches / electricity consumption / energy bills / oil‐fired facilities / energy efficiency measures / electricity industry th / low carbon energy sources / energy efficiency varying / energy performance / energy demand equal / energy sources / electricity sector / energy efficiency targets / energy use / energy efficiency / energy suppliers / energy efficiency certificates / energy services / energy package / energy savings / energy / /