With utilities, it has long been practice, if not legal requirement, for them to detail the costs. Often, they are passing along government fees. I've got zero issue with that. It gets different when they add on fees and blame the government when it isn't really a gov fee or requirement.
My least favorite tipping is those pre-purchase tipping. Coercion of a tip like that suggests that my service may be poor (or worse) if I don't tip. I avoid return visits to anyplace like that.
As to tip%. It used to be 10%. Easy to figure. Since prices go up, why would the % go up, too? Tips should always be for good service, not a default. Once we had horrible service at a fancy restaurant in Vegas (off strip). We made a point of tipping the water boy, who was excellent, and gave a dollar or less to the waiter who was awful.
One of my daughters waited tables at a regional chain. They assumed 20% tip and took from her total to tip out the back of house, too. Effectively, if she didn't average at least 20%, she was losing money.