The numbers are one search away. In fact even without the numbers intuition should be sufficient to see that it makes sense. Auto industry accounts for 20% of t

The numbers are one search away. In fact even without the numbers intuition should be sufficient to see that it makes sense. Auto industry accounts for 20% of total Li batteries. Where as consumer electronics (which is probably growing way faster than electric Auto) accounts for around 37%. Most of the reports I have seen tend to estimate that Auto's share would increase upto 30% by 2020 while renewable energy storage would grow to 60%. It is not really hard to see that real breakthroughs in mass production and lowered prices for Li batteries will come not from auto applications but from power generation sector. I do not know of any sustainably profitable power company that is operating in that area. It also probably explains why Musk is thinking of things like Solarcity and Powerwall. hint: Search "Global Demand for Li batteries" in Google images to see various charts.