Yup, even with the majority of power supplied here in Alberta created by coal plants, it still are less emmissions from using an electric car. Why? Economies of scale means that it's pretty easy to clean up a large plant than every small car.
In response to another question, many diesel cars would do better on fuel than a Prius - for sure if you do mostly highway driving. In fact, lots of cars coming out now can do very well on the highway, something that the Prius is decent at, but certianly isn't the highway fuel mileage king. Driving around the city, though, most cars don't come close to the Prius.
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