If batteries are the enabler, couldn't you just over generate using a cheap base load tech, dumping excess to battery? Or are renewables plus batteries cheaper than base load tech plus batteries?
Yeah battery storage is a arbitrage business. Buy cheap sell high. Buy midnight wind from North Texas at three cents a kwh and resell it on a cloudy humid afternoon in Phoenix for thirty.
Currently fossil fuel and nuclear power is really cheap late at night. In the future it'll be less predictable but there is absolutely a business there.
