greenhouse gas emissions / large scale energy refurbishment operations / electricity / buildings energy efficiency improvement / Smart energy management systems / energy efficiency improvement / energy bills / renewable energy sources / energy performance / energy end / energy efficiency increase objective / average energy refurbishment rate / oil importations / energy efficiency / energy certification scheme / energy saving potential / energy efficiency policies / energy services market / energy renovation / energy efficiency improvement measures / energy services / Energy efficiency renovation / real energy / final energy consumption / energy / /