On April 28-29, 2015, at the workshop “Appeals from decisions of the President of Energy Regulatory Office” organized by MM Conferences in Warsaw, Piotr Suski delivered a lecture on “Standard of judicial review of sanctions imposed by the President of Energy Regulatory Office“. The presentation was devoted to an analysis of court judgments in appeal cases from decisions of the President of the ERO (and other regulators) imposing penalties on entrepreneurs. Mr. Suski discussed how courts apply procedural and substantive guarantees similar to those applicable in criminal matters. The aim of lecture was to present guarantees that should be taken into account by the regulator when imposing penalties for violations of the energy law as well as to be invoked by entrepreneurs in appeals from such penalties.