It depends on what you consider to be a battery. As an energy storage solution, pumping water up into a tower and then letting it drop during high demand is si

It depends on what you consider to be a battery. As an energy storage solution, pumping water up into a tower and then letting it drop during high demand is simple. Its earth friendly because then at peaks it can take some of the load off the generation, which could be less environmentally friendly. Renewables are better than fossil fuels, and not spending the energy to build solar panels is better than the process to create solar panels. As long as it's not a toxic battery, then it should be a pretty good interim.