Tesla is open to other car manufacturers paying to join the network but none have. As of now the supercharger stations only allow Model S and Model X to charge.
I keep hoping someday Nissan, Ford, Chevy, or Toyota will jump in and announce a deal to access the US supercharger network but it doesn't look to happen any time soon.
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Watch for the Tesla Model 3 announcement at the end of this month and compare vs the Chevy Bolt (not the Volt) as those are going to be the cars to beat.
Tesla has made it difficult for other vendors to join by demanding that they share Tesla's "front loaded" pricing scheme. I think this is a huge mistake. It limits the Supercharger to premium cars. As far as I can tell, everything necessary is there in the existing network--all another EV would need is an appropriate connector and the software to use it (CHAdeMO and CCS demonstrate that their batteries and other innards can...the car may need to limit charge to 50KW or so but that's already part of the protocol). A pay per use scheme with separate billing would save $2-3K from the initial cost of the car. That front loaded cost is being used to build out the network, but the market is small enough that it's frustratingly slow. a bigger company would not have to wait.
The Bolt is a big risk for Tesla. It's the first car that even comes close on any of the things that are special about Teslas, and if the 3 isn't competitive with it on price and convenience of long-trip charging, then Tesla risks losing a lot of market share fast. The X is so similar to the S that it's largely cannibalizing S market share instead of bringing new customers in. two fizzles in a row could kill Tesla. GM holds a lot of cards here: They could embrace supercharging and build a lot more supercharger stations, which would be good for both Tesla and the Bolt. OR, They could go with CHAdeMO or CCS and install 1000 long-trip charge stations in the US in a few months, which would pretty much force Tesla drivers to buy the adapter and undermine growth of the supercharger network for the foreseeable future--no matter how superior the technology may be, convenience and good enough will win. OR, they could do their own version of what Tesla is doing and build their own incompatible network, and make it very expensive for others to use it. I guarantee that there's a big faction in the marketing department at GM that wants to do this, and the possibility of killing Tesla is seen as a good thing by them. I hope wiser heads prevail, but it wouldn't be the first time greed for short term profits beat out the long term good of the industry at GM.
--Snortybartfast
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