It doesn't save them money in the long run. However, in the short run, it saves them a bunch of money, since they are simply promising to buy panels from Panaso

It doesn't save them money in the long run. However, in the short run, it saves them a bunch of money, since they are simply promising to buy panels from Panasonic, and they don't have to pay up front for the machinery, labor, and raw materials to produce them. This is a big deal--many have been wondering where Tesla is going to get all of the cash from, and now they don't need quite so much cash.