A while ago a test of electric cars was made here in Denmark. A few cars were put in the hands of "ordinary people" who commuted some 25km back and forth to work. The test was conducted during six months of the cold season.
It wasn't an expensive Tesla X, but a rather modest micro car with a 25-30 kW/h battery which could be charged overnight using a pretty standard household electric installation. And an advertised range of slightly over 100km.
The general consensus of the test drivers was that it was COLD! And it was pretty difficult to look out of the windscreen because of dew.
In order to make it home in the afternoon it was clever not to run the heating system. That wouldn't have been a problem during summer, but then those cars were not equipped with air conditioning.
When there was snow on the road, or worse - half melted snow, the the wheel drag increased to the point where they had to call rescue service to make it back home.
The special low drag tires on the cars were awful in winter conditions, and illegal in most other European countries in winter conditions. Snow tires were not available. If they had been available, then they would have increased the power consumption since good snow tires have considerably higher running drag on a dry road than ordinary summer tires. (Funny thing, unlike all neighbor countries, here in Denmark it isn't strictly illegal to drive in snow on summer tires - it's only stupid - it will change when the law makers find out).
As for the Tesla X, it would be nice if they gave us a few more numbers, for instance the battery capacity. But from the data given we can calculate some rough data.
A 7 seat full size car with exceptionally low air drag and exceptionally low drag tires on a dry road - roads flat as Texas - driving constantly 55 mph will require approximately 20kW power. Going not 55 miles, but 280 miles, that will be 110kW/h on the wheels. Assuming a 90% efficiency on the motor and power train that calls for a 120kW/h battery. That's heavy duty stuff!!! No wonder it is expensive.
Charging that at home in just four hours, well, that's possible. But that will require an electric installation which is roughly ten times bigger that what blows our fuses at an ordinary household installation. That installation will cost a nice little fortune in addition to the car. Still expensive, but way less expensive if you can accept a full charge to last 12 hours instead.
Electricity comes for free, well, almost. Not so much in my country where it is taxed like everything else, more so for households than industries. I pay US$ 0.39 per kW/h. Assuming 90% efficiency on the battery charger, and 90% on the battery itself a full charge runs on just under 150kW/h = $58.
$58 for 450km isn't too bad. That's roughly the same as my VW
Golf 1.4 TSI with today's local gas price = $8.00/gallon. So if you pay less than $8/gal, then you'd better also have some cheaper electricity.
But what are the real figures when we drive up and down hills, start and stop in town traffic, run headlights, heating/air-con, windscreen wipers, and when we drive on snow using snow tires etc.? Is it less than half like the Danish test showed? 200km for $58 isn't a bargain.