Energies (ISSN 1996-1073; CODEN: ENERGA) is a peer-reviewed open access journal of related scientific research, technology development, engineering, and the studies in policy and management and is published semi-monthly online by MDPI. The European Biomass Industry Association (EUBIA), Polish Society of Applied Electromagnetics (PTZE), and Association of European Renewable Energy Research Centres (EUREC) are affiliated with Energies and their members receive a discount on the article processing charges. Subject Areas • Electrical engineering - Electrical power systems; - Power electronics; - High voltage; - Smart grids and microgrids; - Electric vehicles. • Energy and environment, sustainable energy - Bio-energy; - Distributed energy systems; - Carbon emission and utilization; - Clean energy; - The hydrogen energy chain; - Energy and climate change; - Sustainability analysis metrics: theory and applications. • Energy storage and applications - Advanced energy materials; - Batteries, fuel cells, and capacitors; - Micro- and nanoenergy conversion systems. • Energy Sources - Fossil; - Nuclear; - Geothermal; - Hydro; - Wind; - Solar, thermal and PV; - Other (OTEC, wave, tidal, etc.). • Energy fundamentals and conversion - Heat and mass transfer; - Thermodynamics; - Entropy analysis; - Exergy analysis. • Energy and buildings - Smart cities and urban management; - Phase change materials for energy storage. • Diagnostics and prognostics of energy conversion chains - Artificial intelligence in energy systems design and control; - Monitoring and control systems. • Chemical energy - Fuels; - Energy and combustion science; - Petroleum engineering; - New working fluids for energy applications. • Energy economics and policy • Energy use in industry