The final nail in the coffin is Tesla Energy. I am a bear on Tesla Energy too but let's make the argument that the demand for retail energy storage surges and that Tesla Energy is a good enough product able to hold itself steady on large margins.
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What if Tesla Energy is a good product, but it is not the best (bear case)? Let's say the Chinese get serious and flood the market with a battery system that maybe has only 90% of the Powerwall quality but is half as cheap because of hidden subsidies to what they perceive as strategic companies like they did with the PV industry? Then it's not just Powerwall that sinks, but SolarCity as well since its hands are tied and it can't simply pick the better component for its customers. Double loss!
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Schonelucht brings up an important and valid point about Tesla Energy and the GigaFactory. And IIRC you also brought it up in another thread as well. If I understand / interpret correctly you fear the Chinese might consider the storage market of strategic importance that they will 'buy' themselves into that market by offering Li-ION cells (or packs) at a price that can only be reached by subsidies or taking losses, similar as what happened in the Solar panel market. And as price is everything in the storage market (where the end-products are not complex and offered by many) you seem afraid that will block Tesla from selling as they need to make a profit.
I think that there is one important variable that might not have been considered there, and that is the very steep growth of the market in case of lower Li-ION cell pricing, in combination with the time needed to build factories like the Gigafactory.
As soon as the Gigafactory starts to produce the first cells, Tesla can sell any cell produced. IMHO it will be even more production constrained than the Model-S ever was. One example that points to this is the fact that Tesla recently significantly increased the PowerPack price, now being very high compared to even the current cell costs. Tesla has a lot of room to lower prices should that be needed to increase TE demand. That room to lower prices, while making a nice profit, will dramatically improve once the GigaFactory start producing and ramps up production.
You warned for other competitors, with a long list of storage offerings. Nobody on that list will be able to compete with the Tesla cell pricing, and if they do the demand will grow faster than the price lowers.
Now, say the Chinese want to to grab more market share, and lower the price below their profitability level.
Not an immediate problem for Tesla, they have the Model-3 as guaranteed demand. However, the Chinese undercutting even the Gigafactory price will result in a far more a dramatic increase in demand, as even more new applications for Li-ION storage suddenly become competitive.
Maybe you remember the ERCOT / Brattle report that stated big utility storage to become economic at a price below US$ 350 / kWh. In fact IIRC they already thought a 700/kWh level was very interesting. Tesla can make a VERY healthy profit selling at US$ 200,--/kWh as they are aiming for US$ 100,--/kWh costs for GigaFactory cells. Even today, Tesla can sell at US$ 350/kWh with a profit, remember they have PACK pricing below US$ 190,-- already and initial PowerPack price was US$ 25k for 100 kWh (!) before the increase to current price.
http://www.brattle.com/system/news/..._Distributed_Electricity_Storage_in_Texas.pdf
Imagine what the demand will be at the US$ 150,-- / kWh end-user price point ! I think the Chinese will not be able to build factories fast enough to fill that demand, even if they are willing to take these even bigger and bigger losses due to the higher volume.
And of course, that new proven demand from the market will even make it easier for Tesla to find investors for GF-2, -3 etc, etc.
IMHO the demand for Gigafactories, at the production costs and resulting sales prices it aims for, is much bigger than the worldwide production can fulfill in the next 10 years building cell production as fast as possible.
BTW, I remember Elon's "GigaFactory-as-a-product" reference very well. The Chinese might even end up being the first customers for it !