Under Ofcom's revised proposals, household energy bills will rise an average of £12 per year between 2013 and 2021.
The amount is not cumulative as investment and costs "vary year-on-year".
Ofgem said energy bills are expected to rise from today's prices in the following manner:
- 2013/14 - £8.50
- 2014/15 - £7.30
- 2015/16 - £11.20
- 2016/17 - £11.60
- 2017/18 - £13.30
- 2018/19 - £14.50
- 2019/20 - £14.20
- 2020/21 - £15.10
The energy regulator said half the total average bill - £6.20 - is related to tax changes affecting the gas distribution network companies "that are outside Ofgem's control".
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Cloud and outbreaks of rain will ease away eastwards during the morning, clearing the east coast around midday with sunny spells developing.
Police and emergency services are attending the scene.
Rebel-held east remains at risk while the pumping station supplying the western part of the city is once again in operation.