Energy Secretary Ed Davey has claimed that adding around £100 to annual household energy bills by 2020 will reduce costs in the long term, but this was described by an industry insider as an "heroic assumption", ITV Business Editor Laura Kuenssberg said.
Another industry source cast doubt on the government's assumption that energy efficiency will offset increasing costs.
It is the Government's long awaited light bulb moment. The Energy Bill published today envisages changes that would reach into our lives.
By 2020 we will be paying nearly £100 a year more for energy. But whether bills will come down again afterwards is still in dispute.
The coalition will announce plans on updating the energy infrastructure of pylons and power stations, and cutting our reliance on carbon.