I have read that a lot of people are saying theirs has not gone down at all however mine is the lowest bill I have ever had so I can only attribute it to this.
We had solar panels put in so our electricity account is in credit now, so I really couldn't say what difference the tax would have made. I think it's a pity they got rid of it though.
I am about to change Electricity suppliers as it has NOT gone down and I think they are crooks! They are one of the Dirty Three that Greenpeace and others have reported!