Electricity can be very dangerous. You should never put anything into electric sockets, except plugs. There are many sources of electricity such as: Fossil fuels: coal, oil and wood. Sources of electricity were fossil fuels 67%, renewable energy 16% (mainly hydroelectric, wind, solar and biomass), and nuclear power 13%, and other sources were 3%. The majority of fossil fuel usage for the generation of electricity was coal and gas. The electricity produced in power stations is carried through wires into buildings. This is called mains electricity.