> Solar and wind ... cannot be the sole basis for a power grid without positing some new energy storage .. for which there is nothing on the horizon. In invest

> Solar and wind ... cannot be the sole basis for a power grid without positing some new energy storage .. for which there is nothing on the horizon. In investment and projects true, in technology no. It's just a bit expensive and politics.. Useful technologies (dramatic reduction of required storage): * HV DC long-range transmissions (Russia) * offshore wind (Hornsea) * load scheduling (home dual tarrifs, remote-managed water heaters, regulated aluminum smelting, upcoming vehicle charging, ..) * plain old overprovisioning Slow Storage: * electrolytic hydrogen stored in caverns (estimated cca 40% efficiency) * automated train (cars) loaded with rocks on a slope (85% eff.) Fast storage: * batteries (Tesla) * flywheels Not that useful for scaling: * pumped / regulated hydro - currently very important but scaling limited by geography.