Very Short Introductions: Brilliant, Sharp, Inspiring Energy is vital for a good standard of living, and affordable sources of power that do not cause climate change or pollution are crucial. Renewable energy is recognised as providing the answer, with countries from around the world deciding at COP28 in 2023 to aim to triple the global renewable energy capacity by 2030, for the transition away from fossil fields to be on track for net-zero emissions by 2050. This Very Short Introduction describes the main sources of renewable energy- solar PV, wind, hydropower, and biomass - their innovative technologies, and what each could deliver. It also discusses the relatively small contributions expected from tidal, wave, geothermal, and nuclear power, and from carbon capture and storage. Nick Jelley presents how the variability of solar PV and wind power can be handled in an electricity grid predominantly powered by renewables, and discusses recent innovations in batteries and other energy