World's average annual electric energy per capita is around 3MWh. Nuclear alone can cater the need of world for 1200 years. its amazing figure. Nuclear and coal are base loads(primary sources) and without these renewable sources, there is no sustainability. Battery is always a secondary source.

Even though, the world needs energy sources to recharge the sufficient batteries. That's why people are searching for various kinds of energy sources. What I'm worrying about is that can the needs be satisfied or if the earth can tolerant too much heat released during the production of energy.

World's average annual electric energy per capita is around 3MWh. Nuclear alone can cater the need of world for 1200 years. its amazing figure. Nuclear and coal are base loads(primary sources) and without these renewable sources, there is no sustainability. Battery is always a secondary source.

Nuclear is already going "out of market" just looking at the figures of cost / MWh produced by this energy source (not considering the impact costs of dismantling such a plant). Solar is MUCH cheaper already in most world countries... and here your point: batteries are good means to overcome the natural fluctuation of Solar/Wind (issue that those traditional - non-renewables energy sources don't have).

Nuclear could be a source of energy for energy storage, but as a base load generation technology I don't see battery storage becoming a driver to change operations or economic viability of nuclear. Intermittent wind and solar would however in my opinion become more viable with an increased capacity factor and utilization with energy storage using battery, electrochemical and/or hydrogen energy storage.

I agree with Nelaturi V Raghavaiah , a secondary (rechargeable) battery (sB) is a ... secondary energy source for electrical circuits. A similar example is getting food from refrigerators (deep freezers); we must replace the food we get at an easy time/ing.

So, we, always, need/have to use a BIG-primary source to drive a small part of this energy towards a sB (rechargeable/secondary battery); we need/have to replace the (discharged percentage of the) battery energy we get upon a common load use), upon discharging; we replace/restore at an, easy, later, time/ing (charging).