The 4th International Conference of Energy Harvesting, Storage, and Transfer (EHST’20) aims to become the leading annual conference in fields related to energy harvesting, storage, and transfer. Topics for EHST’20 include, but are not limited, to the following: Biomass, Biofuel, and Bioenergy Energy and Environmental Pollution Energy and Nanotechnology Energy Distribution Energy Financing Energy Storage Electric Vehicles Fossil Fuels Fuel Cells Geothermal Energy Hydroenergy Nuclear Energies, Prospects and Issues Smart Buildings Solar Cell Theory and Applications Solar Thermal Energy Wave and Tide Energies Wind Energy