The main challenges that need to be addressed in order to increase the sustainability of the energy system include increasing import dependence, diversification of energy mix, volatile energy prices, rising energy demand, growing threats posed by climate change, decarbonization of the economy, slow progress in energy efficiency, and opportunities arising from increasing the share of renewable energy sources. The focus of the research carried out in the CESISP Sustainability and Energy Policy Lab is on the economics and regulation of the energy market and in particular: renewables, decarbonization, energy efficiency, clean energy technologies, sustainable mobility, gas distribution.