The unreliability of solar and wind power compared with that generated by fossil fuels is well known and with it the concomitant need for storage facilities such as large battery packs to smooth things over. Modern electrical grids operate on alternating currents (ac), and these need to be of a fixed and reliable frequency (usually either 50hz or 60hz). This frequency’s stability is maintained by a phenomenon called grid inertia, which results from the real, physical inertia embodied in the power-generating turbines of fossil-fuel (and also nuclear and hydroelectric) power stations. What more is need in the green energy transformation ?
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