On 16/05/16 15:14, Mike Tomlinson wrote:

"This is because the two reservoirs are linked by one of Britains biggest
post-war industrial projects: the Dinorwig pumped storage power station,
hidden within this mountain. It is effectively a monster battery: power is
stored by pumping water from Llyn Peris to Marchlyn Mawr at night, then
generated by letting it flow back down at times of peak demand"

http://www.theregister.co.uk/2016/05...tric_mountain/


What's even more amazing is that with the press of a button marked
"MAXGEN"[1], it can go from zero to full output in 15 seconds.

[1] At least when the control was at Bankside