David MacKay is a physics professor who is also chief scientific advisor to the UK Department of Energy and Climate Change. 

From the Guardian today:

Every person in Britain will need to pay about £5,000 a year between now and 2050 on rebuilding and using the nation's entire energy system, according to government figures. But the cost of developing clean and sustainable electricity, heating and transport will be very similar to replacing today's ageing and polluting power stations, the analysis finds.

More interesting comment from AJ Lucas ahead of their restart of today's trading after a seven month suspension, during which their stake in Cuadrilla is turning into a very interesting play.  On one hand, one can't expect them to talk the story any way but up,  but their spin is interesting nevertheless:

 Lucas's crown jewel is an effective 56 per cent interest in the Bowland prospect near Blackpool in Britain via a 25 per cent direct stake and a 42 per cent holding in Cuadrilla, which since its drilling results at the Preece Hall 1 well may hold the key to a new phase in the British gas supply industry.

AJ Lucas,  the Australian drilling services provider has had shares suspended since May for other reasons, but trading starts Wednesday Oz time. AJL is the only way of outside investors getting into Cuadrilla Resources the UK company which  has had some promising initial results and estimates in Lancashire, so they are naturally interested in talking up their investment.  AJL holds 42% of Cuadrilla, with the rest held by hedge fund Riverstone and the management team. So we shouldn't be surprised if the CEO of AJL tells the Sydney Morning Herald

If the science is what we think it is, it's a very substantial resource,'' the chief executive of AJ Lucas, Allan Campbell, tells BusinessDay. ''It comes down to what the rocks say - they've got all the answers.

A key objection of the UK's Tyndall Centre report on shale gas depends on a key misunderstanding about the impact of gas on electricity generation. Gas is not the enemy of renewables. In fact, current renewable solar and wind tech just won't work without gas as back up.  In that sense,  plentiful gas, which naturally becomes both physically secure and not open to price spikes, enables renewables.  But the Tyndall Centre doesn't see it that way: