Renewable energy is very much the topic for the Twenty-teens.
But it’s so much more than #electricity generation from #solarPV and #wind (as great as those technologies are).
- hydropower - traditionally harnessed from dams, now expanding into power from water currents, waves and tides.
- biomass energy can provide heat, mechanical power or electrical power. Sources include landfill gas, crop residues, fuel crops (e.g. corn, sugar), and waste-to-energy. 2nd generation biofuels (from non-food crops), biomass gasification, and microalgae-derived fuels are all in heavy development.
- geothermal heat can be converted to electricity in locations with good (high temperature) hot water or rocks underground. The costs can be high but it’s a reliable and steady source.
- solarthermal gets less attention than solar PV, but at scale provides options for industrial heating as well as electricity.
The renewables revolution is only just getting started.