So most of the power used by those Tesla autos is coming from burning hydrocarbon fuels, just someplace other than under the hood.
While cars do run at least partially on carbon based fuels burned at power plants, how much it pollutes depends greatly on where you live. But don't think for a moment that they are somehow "just as bad" as gas powered cars. In most states, EVs are *considerably* greener than any gas powered car, even the latest hybrids.
Kentucky and WV have the most carbon-based electricity production. Even then, an average EV gets the equivalent of a 45 MPG car, meaning it's better than anything short of a Prius.
In MD, where I live, it's the equivalent of a 70 MPG car.
In the best state, WA, it's the equivalent of an 85 MPG car.
In Quebec, which is 99% renewables, it's effectively carbon-free. It's also the cheapest electricity in North America at 7.7c/kwh.
Then there's the cost of electricity vs gas. In no state is it cheaper to run a car on gas than electricity. Even in HI, where electricity is the most expensive, it's still cheaper to run on electricity. Going the other way, in ND, where electricity is the cheapest in the country, it's ~1/3 the cost of gas per mile.