The man charged with regulating the energy industry will answer to MPs later today after it emerged profits of Britain's "Big Six" energy suppliers multiplied five-fold to more than £1 billion since 2009.
Ofgem chief executive Andrew Wright is giving evidence to the Commons Energy and Climate Change Committee at 9:30am.
Data released by Ofgem yesterday, show the combined underlying earnings - before interest payments or tax - of the Big Six of £1.19 billion in 2012, a rise of £221 million in 2009.
British Gas, E.ON, EDF, npower, ScottishPower and SSE blamed rising wholesale energy prices, higher distribution costs and Government green levies for the increases.
More top news
John Underhill said geological changes 55 million years ago mean the UK's geology is unsuitable for shale oil and gas production.
Argos will have to pay an additional £1.5 million to staff they underpaid, a government investigation has ruled.
The government reportedly plans to allow visa-free travel to continue after Brexit for visitors from the European Union.