[jsingleton]

Pumped storage is typically reported separately from Hydro. So much so that Hydro is officially referred to as "Non-pumped storage Hydro". Pumped isn't included as a renewable because the energy mix will depend on when it's recharging as a consumer of the grid. Typically this is overnight so usually nuclear power and wind is used as coal and gas spin down then.

Currently both pumped and hydro are making up about 1% of the UK grid each: http://www.gridwatch.templar.co.uk

It's only useful to think about it in the short term as long term it adds nothing. It just functions as a buffer.

You can go round one in Wales: http://www.electricmountain.co.uk