"[...] the energy companies would use it to further confuse pricing to the point where you wouldn't have a clue which was the cheapest."
I am confused enough already. On my last gas bill British Gas showed my annual consumption was the same as the year before. It also raised my monthly budget payments from £28 to £41. A couple of weeks later another letter arrived raising that to £45.
A few weeks later a letter said that a mistake had been made on my billing and a new bill would be sent within 7 days. That was 20 days ago - no letter yet. Ringing the number provided gave a long spiel on how to claim "poverty" benefits etc before going to the whack-a-digit system. Finally getting the "speak to human" option - "We are very busy - current waiting time is 30 minutes". My cordless phone only lasts about that long before needing a recharge.