Faith and belief in the current team assembled. We know there is a need for storage that is going to increase exponentially, we know the grid and electricity problems globally are overwhelming, It appears their product is pretty solid, so we are banking on the team and the leaders of this company to make it happen. At this juncture if you believe in the team you buy the stock, if you don't then you wait.
What isn't even factored into this equation really is that this is a 2013-2015 story. Their are electricity issues now that are severe and oil is a 100 a barrel with 8.6% (by government numbers) to what is probably 15% unemployment. What if unemployment is back down to 4 or 5% and Europe and Japan are recovering, India straightens itself out for a business climate. Who knows, should be fine.