“ What's wrong with windmills? “ – Sir Osis of Liver
Unpredictable sources like wind and solar mean very little to the grid unless there are means to store the energy they generate. Sending in electricity to the grid during off-peak hours is just waste. Output of nuke and coal/gas-fired plants cannot be adjusted easily, so they have to keep generating regardless of wind or solar. Peak-to-valley ratio of the demand is about two-to-one. If we can store the surplus energy during off peak hours and send back the stored energy during peak hours we do not need new plants and even we can decommission many plants. Although the wind and solar are more glamorous (scientifically and politically) and their research and construction are easier to get tax money subsidies, first thing is first. Let’s find the way to store the energy they produce. Of course efforts have been made to store the surplus energy… pump-up hydro, NaS battery, flywheels, molten salt etc. But, the Li-ion battery currently developed for the automotive use is most promising. In other words, when we have the Li-ion battery suitable for propelling automobiles, then the same battery can be used to store the off-peak hour surplus for peak-hour operation of air conditioners, kitchen stoves, TV’s, computers, baseboard heater, cloths dryers etc. etc.