The average reduction should be 11 percent, it said.
Utility officials said, however, that business customers could expect an average reduction of 3 percent in their bills.
The average reduction is 53 percent two times what is mandated by law.
The 5% cut will mean an average reduction in bills of about £40 a year and will come into effect on 7 February.
It ran in March 2011 and achieved an average 28% reduction.
What is the projected average reduction in sentence for eligible defendants?
This worked out at an average reduction of £26.30 per year for that period.
The average reductions would be largest for families with two or more children.
The average reduction in the frequency of nightmares after seven months was from more than four a week to about two.
The average reduction is estimated to be $255 a household.