Energy storage technology may be the singular, most important component in our nation’s transition away from fossil fuels to renewable energy, since utility-scale, battery systems provide the flexibility to absorb, store and deploy energy at locations where and when the power is most needed. Energy storage is crucial to replacing America’s fleet of polluting, fossil fuel plants because they integrate the increasing amounts of wind, solar and hydropower being transmitted hundreds of miles without jeopardizing grid reliability — sometimes the wind isn’t blowing or the sun isn’t shining where and when the power is most needed.