Sometimes you have a nice dam that can either tap or leave alone, knowing that the water will still be there when you need. Sometimes you just have a flowing r

Sometimes you have a nice dam that can either tap or leave alone, knowing that the water will still be there when you need. Sometimes you just have a flowing river -- and sometimes that river doesn't flow so fast. Hydro isn't a single thing. The former can be used to compensate when the wind doesn't blow and the sun doesn't shine. The latter can't really. Uruguay has the former. Parts of the US has the former. Does all of the US?