Tate Modern Oil Tanks Tour

I went to visit this, this weekend.

Did you know that Tate Modern still converts electricity for South London?
They still have massive and really noisy converters all along the turbine hall on the right as you walk in. That's partly how they're going to finance this:

It sounds great. It will have 11 floors of galleries, cafés and educational bits and bobs. The Turbine Hall will be twice the width and twice the fun.