As the world adds solar and wind energy capacity at an unprecedented scale, we are increasingly faced with an energy variability crisis. Solar panels only produce energy when the sun is shining, and wind turbines when the wind is blowing. Unfortunately, energy demand curves are often directly at odds with these production trends. This creates a major dilemma for the energy grid, as well as for energy markets. And market volatility, including record-breaking negative energy prices in places where renewables have been deployed at a massive scale,…