Here is the source article:
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streetinsider.com has picked up on it too:
http://www.streetinsider.com/Rumors/Tesla+Motors+%28TSLA%29+and+JA+Solar+%28JASO%29+Building+Charging+Stations+in+Shanghai/9394882.html
I don't think that this will have a big direct financial impact on JA Solar's financials. But the free PR can have a huge effect on JA's brand awareness and is great marketing.
JA Solar (from everything I have read) is the leader in panel efficiency in China, but more importantly makes the highest quality panels. They brag that their cells are "the best" and aren't afraid to say it in public (I was just watching a video yesterday where the JASO guy, who was sitting right next to the JKS guy, said that "everyone knows that our cells are the best," and the JKS guy didn't even flinch).
Another thing that makes JASO stand out is that they prefer to make everything in house to keep an eye on quality control. They want their panels to produce the most electricity over the 25 year period with minimal failures. Their goal is to lower levelized cost of electricity "LCOE" and not to simply minimize dollar per watt peak cost. Other Chinese solar companies do a ton of outsourcing, whether it be for module assembly or cell purchases.
For obvious reasons Tesla had to go with a local solar company to supply panels and install them. I would guess that they went with JASO, because they wanted the highest quality panels to minimize the chance of downtime due to panel failure; and Tesla can also install more watts with higher efficiency panels from JASO. A supercharger station breaking down is just as bad as a Model S breaking down.
I think that this is great news for JASO, because it is starting to prove my investment thesis in this company: that highest quality, highest efficiency panels at a reasonable cost will rule the market, which will slowly move away from power plants into distributed generation. Companies can get away with lower efficiency products for now, because it doesn't really matter too much in the power plant market. But DG is the future and efficiency will rule that market.