Sweden have by hour and more recently by 10 minute electricity billing. Companies use it in automatic load balancing, car chargers use it, and IoT pilled dads in their 50s make home assistant schedules based on it.

It's pretty good! The need came from the high variability of wind power. Less dystopian than ... data centers... urgh.

It's of course optional. If you optimise well you can beat the monthly or daily tables and save quite a bit. If you don't care; you pay whatever the grid operator estimates.