At no point did I say that Scotland’s hydro is untapped. I said it is used “on tap” to fulfill peaks in demand.
Aye sorry, I was half-cut when I typed the reply!
For numbers on ‘untapped’ Scottish hydro-potential: http://www.british-hydro.org/UK%20Hydro%20Resource/Scottish%20Hydro%20Resource%20Study%20Aug%202008.pdf
However, it’s unlikely we’ll see any more large projects due to the perceived/actual environmental impacts of building dams etc. Microgeneration is much more likely to be a better option, with the Feed-in Tariff.
In terms of the economics of wind power, on-shore is expected to be comparable to CCS (once commercialised), while off-shore will remain significantly more expensive, mostly due to the very high initial capital costs. However CCS projects are able to provide the base-load that wind can’t, and so are a better option anyway at least in that regard.