An article by Kate Galbraith, The New York Times.

SAN FRANCISCO — The biggest problem with solar panels and wind turbines is that they do not produce energy all the time.

So what is the solution?

Batteries. And other technologies that store energy to be released when it is needed.

As renewable energy becomes increasingly commonplace, interest in energy storage technologies is growing around the world. Researchers in Germany, Japan, the United States and elsewhere are finding governments increasingly willing to support their ideas, although many projects are in the early stages. Cheap, large-scale energy storage is considered the holy grail of renewable power because it would allow wind and solar farms to provide constant energy to the electric grid.

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