The 2013 Proxy Statement is now available online: http://www.sec.gov/Archives/edgar/data/1318605/000119312513158904/d506419ddef14a.htm Haven't read it yet, but they often contain interesting tidbits of information. - - - Updated - - - From the proxy:
Didn't they setup a lot of skylights in the ceiling to let a lot of natural light in?! PV panels may not be feasible for that reason.
At one point (maybe in the Norway talk) he mentioned that the reason the solar panels were not installed to offset the charger stations is because Tesla did not have the credit for it. That could be the reason why there are not panels on the factory roof. I think we will find out soon if thats the case. Their credit score will go up when they post the numbers in the black edit: Thanks for link to report ... very nice tidbits
gg - 3%-4% of roof area is what you typically need to provide good daylighting if you have the right diffusing material in the skylight and reflecting material on the ceiling/walls, so that still leaves a lot of roof! Weight might be a factor, though I suspect it would be typical for the roof structure of 20+ years ago to be upsized to hold the dynamic loads of cranes, etc in certain areas. Not sure if Tesla has much, if any, interior roof loads (haven't toured factory). From video it looks like all the robotics and product movement is based off the floor structure. All this is OT to proxy statement, just gap-filling.