Cost-optimal building performance requirements; energy labels in shops – how often do we really see them; results of verification of 2010 CO2 emissions reduction within the Green light to savings programnme; the new Act on supported energy sources and its impact on the efficiency of biomass and biogas use; how much do energy-efficiency subsidies cost; re-commissioning – energy savings with low costs; summary of international activities, seminars and presentations organised by SEVEn; energy-efficiency of yours data centre; driving (energy) class and course ECOWILL; LED light bulbs for households; EPC advancement in the Czech Republic.