What makes you think electric cars need "reliable" electricity?
Charging a car is something which is very well suited to using excess or unreliable energy supplies. Whilst the tech is not yet there to manage the process for electric cars to take power from the grid when there is excess (lots of wind, lower than normal base consumption) actually helps manage the grid by reducing spiky demand.
The only bit missing to make this happen is the "smarts" from somewhere for the chargers to stop taking power from the grid when it's under heavy load.
Use of local (by which I mean personal/individual/on-house) solar or wind power is also ideal because it can take when available and store it to use. With the right control gear you could also only charge your EV if these sources are available (or any other conditions you wanted).