I frequently hear this argument, and my first reaction was to agree with this. However I don't think that creating a flexible grid that can handle the erratic g

I frequently hear this argument, and my first reaction was to agree with this. However I don't think that creating a flexible grid that can handle the erratic generation and consumption of power is as easy as it sounds. My gut feeling is that the devil is in the details, and it may take much longer than non-experts think (most of who I presume think that simply slapping energy storages to a system with varying input-output rates solves everything). Unfortunately I'm not an expert in this field, and I'm not even sure what the field of engineering is called that deals with large energy grids.