I actually learned just recently that most of our energy consumption goes to creating heat or cooling, like 70% or something. So right now we are creating elect

I actually learned just recently that most of our energy consumption goes to creating heat or cooling, like 70% or something. So right now we are creating electricity to convert to heat or cooling, while we technically could just store the heat instead. A large enough pool of water could store heat for long periods (months) with minimal energy loss. So the notion that energy from renewable sources such as the sun can't be stored effectively is not true, and in fact the big part of our energy needs could be stored this way.