“The wind doesn’t always blow and sunlight isn’t always striking every solar panel. Renewable energy desperately needs a very big battery, a load leveler. Without
some form of energy storage, renewables are physically limited to less than a twenty percent share of the grid. At twenty percent, renewables are more of a headache than a resource for a grid manager. Electricity storage tools are expensive. Very expensive. Too expensive to justify on their own or at societal scale.”