No, they can not.
They also cannot refuse you service because a previous tenant has a balance with them. They will not hesitate to turn the utilities on in your name. If you have no payment history with them, they will probably require a deposit.
Guys, share whatever you're smokin'.

The idea that they would deny him service because someone else didn't pay their bill is ludicrous. Especially since
who knows he lived there at the time of the delinquent roommate? Every CSR that works for the utility? lol.. Don't be silly.
OP, call 'em up and say "I just moved in and need to turn on electrical service". They will say "OKAY!" and set your shit up. I'm sure they can see a list of accounts under each address, but that doesn't matter. They will simply sell his account to a collections agency if he doesn't pay up.