The module covers two major aspects of energy systems. The first aspect is the technology that underpins energy systems design and the second aspect is the energy management that can help organisation to improve their energy efficiency. Topics covered under this module are: modes of energy supply, energy distribution systems, constraints on carbon and non-carbon-based energy resources, challenges, data acquisition, control in energy systems and constraints on end-use efficiency of energy, environmental sustainability of energy supply systems, energy audit, and energy management.