@blablarg18 From my experience, the reality is that they're not as great as they're made out to be. For instance, there are several cases here in Ontario (Canada) where local fire departments have had to consult with the manufacturer of various EV's because in the event of a bad crash, the batteries are known for heating up and randomly bursting into flames, having to be put out multiple times by the fire department, only to burst into flames again.
As well, there lies the issue of the batteries. Not only are they not recyclable, but to make matters even worse, they come at a crazy cost and need to be replaced every few years. IMHO, the "green vehicle" concept needs to come a lot further than it already has to be a viable replacement for traditional gas powered vehicles.
As for the power situation, here in Ontario, most of our electrical supply comes from running water such as rivers, and lakes, or even the biggest supply of them all.... Niagara Falls. So in that sense (at least in Canada), they do have far fewer emissions, however on a global scale, a lot of the electricity used to power these things comes from coal or nuclear power plants, which put out just as much emissions to produce the energy as the gas powered vehicles do, thereby making them ineffective as a "green" solution.