As in all things "Green", there is much misinformation in the public domain. A while back I read an article on the Tesla "supercharging" stations in the US which noted that these were equipped with roof-top solar panels and therefore accepted that the power was "renewable". No one did any checking on the relevant figures of solar output versus the charging load, let alone ask the obvious question about night-time motoring.
Tesla used to promote the obvious alternative of battery-swapping, with the claim that it could be done in a similar timescale to filling a tank. There was a lot of comment to the effect that this is impractical with the current models and it seems to have dropped off the radar.
Some of the car mags are running EVs on long-term tests now so it will be interesting to see how they get on.
With the UK's mix of power generation I suspect that a "well-to-wheel" assessment would find that a modern diesel beats an EV on CO2.

NW; the Tesla battery-swap demo is shrouded in suspicion, going by comments on a few motoring blogs. Apparently it was done behind screens and without independent witnesses. Several mechanical types commented that, having seen the structure of the car and how the battery is mounted, rapid replacement seemed impractical.
If/when I ever get to see one in the flesh, it will be interesting to have a close look.
Battery-swap is probably the only viable solution to the charging and range issues at the moment. But it has many problems of its own: inventory costs; provision of specialist "service stations" with skilled fitters etc; how to control for mistreated units; etc..
IIRC, Tesla's batteries are guaranteed for 10 years. Since replacement costs are >k$10 (from what I have read), the cars won't be worth much as they age.

Tesla seem to be leading the charge (sorry) as they have by far the best range (claimed).
However they are not cheap: I have just read a review of a high-spec Tesla S which sells for $97,000 in the US.
Here are a couple of excerpts:
<< The genius of its delivery is all about instant, perfect accelerator response. Flatten it and the Model S takes off from a standing start with the ferocity of a super-saloon. We timed the car at a 4.7sec two-way average to 60mph, which is marginally slower than Tesla’s claim. But it’s also faster than the Mercedes-Benz CLS63 AMG we timed in 2011 – a car that was burning fossil fuel at a rate of 7.8mpg.
The Tesla Model S can’t sustain being flat out for very long, however. For short bursts of full-power acceleration, the electric powertrain works brilliantly. But we couldn’t complete one flying lap of the dry handling circuit before the battery, inverter and electric motor tripped into safe mode and cut peak output by at least 50 per cent.
Including our performance tests, the car averaged 411Wh/mile overall but, out on the road, we frequently saw trip economy of less than 300Wh/mile. On a typical motorway run, expect a range of 220 to 250 miles. If you’re prepared to cruise at a 50-60mph A-road pace, 300 miles would be routinely achievable.
That’s about three times the real-world operational range of any EV we’ve tested before. It won’t be enough for everyone, particularly considering the time that the car takes to charge (15 hours from a 32-amp UK public charging point; half that from a fitted high-output Tesla home charger). >>
....and if you only have a standard 13 Amp socket it will presumably take over 30 hours.