the BBC report:
"ScottishPower is bidding for £1bn in funding from the UK government to help pay for the project. Both ScottishPower and the Department of Energy and Climate Change insist negotiations are continuing. But sources have told BBC Scotland the future of the scheme is now in serious doubt. They said there were question marks over the UK government's commitment to an "as-yet unproven technology".
The last few words in (my) bold sum it up.
The funding is public money and derives from a number of public policy assumptions about carbon and its relationship to global warming. These assumptions are also unproven - at the very least in respect of the catastrophic effects which Al Gore portrayed a couple of weeks ago in his fear-fest with the Scottish Government.