On 14 Apr 2006 21:53:18 GMT, (Andrew Gabriel) said:

I wrote a more detailed article about this a few years ago, which
discusses various notable historic events, like how the power grid
had to handle the majority of the UK using the toilet at the same
instant, which resulted in the largest ever surge in demand on the
UK power grid (which with advanced planning, it handled just
fine)...
http://groups.google.com/group/sci.e...1a4f753?hl=en&

You mention Dinorwic/Dinorwig - there's a more detailed posting about
it at

http://groups.google.com/group/uk.rec.subterranea/msg/dd48c794775000bf

--
Alan J. Wylie http://www.wylie.me.uk/
"Perfection [in design] is achieved not when there is nothing left to add,
but rather when there is nothing left to take away."
-- Antoine de Saint-Exupery