Customers on "poor value" out-of-date tariffs, who are paying a higher rate than their supplier's cheapest standard tariff, will be switched to the cheaper rate.
Addressing MPs later, Mr Davey said a lot of people were on out-of-date tariffs and "bringing them down is going to save some of those people, indeed some of the most vulnerable, money and that is the right thing to do".
He added that the decision to go for the latest possible date for tariff cuts was influenced by what had happened with a similar green energy scheme earlier that summer.
For each observation, data included information on hospital diagnosis and procedures (International Classification of Diseases, 9th revision (ICD9), Clinical Modification codes), inpatient mortality, hospitalization and discharge dates, DRG tariffs and demographic variables (municipality of patient residence, age and sex).
Accelerated consideration for release for the 3,000 prisoners jailed indefinitely for the public protection who have already passed their tariff date.
A woman who claims she was wrongly convicted of murdering her aunt 13 years ago will be released on parole next week, her earliest tariff date.
In 2005, May was released, a week before her 12-year tariff date, becoming the first prisoner to gain release 'on time' while still denying the offence.
He also confirmed that moves were under way to try to reduce the 4,000 prisoners serving indeterminate sentences for public protection, many of whom have served well beyond their recommended "tariff" date.
A woman who was convicted of killing her elderly aunt could become the first lifer professing her innocence to be released on her tariff date, if a recommendation from the Parole Board is approved by the home secretary this month.
The statistics also reveal that there are still more than 5,000 prisoners serving the now abolished indeterminate sentence for public protection, of whom 70% have already passed their "tariff" date.
(27) The availability of transparent, up-to-date and comparable tariffs is a key element for consumers in competitive markets with several providers offering services.
