A few months ago when I switched from my old 2009 Infiniti FX 50S to a 2013 Volt my insurance went down about by about 3 dollars a month. I called GEICO to complain that given the comparative value and horsepower differences of the cars my insurance should have dropped by more than $3. The first agent I spoke to said Volts are expensive to insure because they are part electric. I didn't buy that. I called around and got much better quotes from other providers. I called GEICO back and gave them those figures. The agent said that the other companies must have been running their quotes using some new method based on credit score and that she'd run GEICO's version for me. My insurance dropped by over $70 dollars a month for the exact same coverage. So maybe insurance on a Volt and other electric cars is higher, but it is certainly may be worth calling your company to make sure that they've applied every applicable discount and used every calculation method to make sure that you are getting the best rate that you can.
Best to call your company and see if they can apply any additional discounts to your policy. I'm with Allstate and they give me discounts for winter tires, taking a safety program, new vehicle discount, etc.