Mike Mitchell wrote:

As far as I can tell this
is because adjusting the amount of power generated is difficult and
takes a lot of time - so when demand drops suddenly (or unexpentedly)
they just turn on lots of heaters to soak up the spare. Neat eh?

Not really. What do I want with a heater coming on outwith my control
when it's already hot enough to fry an egg on the floor in summer?

Errr, you'd have them switched off at the wall in summer.

--
Scott

Where are we going and why am I in this handbasket?