I was asked today by one of my sellers if they should call the utility company and cancel there utilities. I informed them if they cancel their utilities, the buyer will have to pay a reconnection fee, and they won't be to happy.
So, the answer is no. What you should do when selling a home, is call your utility provider, and inform them you are selling your home. Let them know that the buyer will be calling to change over the account into their name. Your agent should be in contact with the buyers agent, and they will schedule a date for the utilites to be changed over. The buyer usually changes it on the funding/closing date.
This may seem like something very simple, but can be a headache if over looked. You don't want to pay for someone else's utility bill, and you never know if a buyer will cooperate with you after they have moved in. They may be un-willing to pay for the utilities for the time they were still in the sellers name.