Given the central role of energy in sustainable development, decision-makers need well-grounded insights about the current status and future developments of the energy systems to plan accordingly. The course MJ2382 Energy Data, Balances and Projections gives an in-depth look at how energy demand (electricity and all fuels) in diverse countries can be studied, together with exploring basic energy system economic concepts related to energy infrastructure investments, energy-environment economics and the role of indicators for sustainable development.