I'd like to remind people that Tesla's people on the phone are currently telling people that the wait time for a Powerwall "in most regions" is 6 to 12 months, and they appear to be *understating* the wait time. Powerpack *contracts announced* amount to gigawatt-hours. Last news from Musk is that TE was cell-starved.
I realize that "guidance" was merely to double last year's production, but if that's the case, it's due to production limitations at the cell, module, or pack level, (or possibly the installation level, but they do sell to third-party installers), and not demand limitations. I wish we could get more insight; if they can ramp up the other aspects of Powerwall/Powerpack production, they can absorb every cell they can get, easily.
Suppose that they do need to stockpile 7.5 GWh of cells for a few months. At $100/kWh (plausible), that's $750 million. This sounds like a lot of cash but it's absolutely manageable if there's a clear pathway to using them up later in the year (Shanghai, more TE pack production lines, better production rates at Fremont, whatever)