The government has allocated funds for two years to pay for reforms designed to reduce bills by switching some elements of it's insulation programmes to government spending.
Q&A on energy bill changes
The Autumn Statement allocated £320m a year to measures designed to protect vulnerable bill payers - previously funded through bills, but only until 2015/16.
The figures reveal the most expensive measure is the widely trailed and supported freeze in fuel duty - which cost more than all the government's other energy reforms put together by 2018 (£780m).
Support for grants for insulation in homes, rented apartments and government buildings will cost £180m a year, but will also expire by 2016.
Ministers have calculated their changes to home insulation measures will be carbon neutral, due to the additional support measures paid through taxation.
If the measures are not replicated after the next election, however, insulation measures will be curtailed.