sscotsman is pretty much spot on. Electric snow blowers have their place and will work well in a lot of applications but cannot replace a motorized one when it comes to large areas and distance from the house.
I picked op a Toro 1800 Power Curve electric at a garage sale last summer in really nice shape for $12 bucks. I didn't even know they made those things. My purpose was to clear my rear deck which I had to shovel/push snow off of before. Amazing little machine that weighs 24# takes me 10 min to do what took 45 before.
For my drive I have a Kubota BX2230 w/50" blower that takes a good hour to do. Not the place for a little 18" electric.
If you do decide to get it make sure you use a minimum 14/3 extension cord so you don't burn out the motor.
You can also check that model out on Utube and see them in action and get some feedback.