The final nail in the fossil fuel coffin

 From Just Have a Think

When he describes batteries as, say, 500 MW and 2000 MWh, what that means is that the battery can produce 500 MW of electricity for 4 hours (2000/500).  MW is a measure of the output, MWh (or kWh in the case of an EV battery) in this context, is a measure of how much electricity has been stored.

We still don't have a cure for multi-day windless periods--dunkelflaute--but that may be the only place where we will still need gas peaker plants (for now).   For most of the world within 40 degrees of the equator, 8 hours of storage will be enough, as night demand is about two-thirds of average day-time demand.  This means that solar combined with 8 hours of storage will provide power 24/7.  And that's ignoring the huge capacity available with EVs.  For example, Australia has 16 million passenger vehicle and 4 million light commercial trucks.  At 40 kWh storage per EV, that totals to 800,000 MWh/ 800 GWh of stored electricity.  Obviously, only some of that is available at any given time, but even if merely one quarter is available, this would provide 200 GWh of storage.  Even before you add grid-scale batteries, which are about 23 GWh at the moment.