The Article makes a big deal about the efficiency of panels, which essentially means how many watts I can get from a square foot of solar panel. I think for th

The Article makes a big deal about the efficiency of panels, which essentially means how many watts I can get from a square foot of solar panel. I think for the consumer it's much more important how many watts I get per dollar, not per square foot. I'll put 18% efficient panels on my roof over a 22% that costs twice as much per watt, for example. I think the real advantage of this factory for solar city is the lower price that comes with economies of scale. So even if five or ten years down the road someone else makes panels with higher efficiency, it won't really matter unless they can also match the price.