On 08/02/2021 13:44, Clive Arthur wrote:
On 08/02/2021 08:42, polygonum_on_google wrote:
Anyone convinced?

Powering up: UK hills could be used as energy 'batteries'

snipped

Figures from BBC article...

'Bigger than Olympic swimming pool'.Â* Say twice as big, so 5000 m^3

'2.5 x density of water' so 12500 T or 12.5E6 kg

'200m high' so 200 * 12.5E6 * 9.81 joules = 24.5E9 J


I wonder how large a clock spring would have to be to store 24.5 GJ -
they're pretty efficient. Would it fit in the same volume as the
tarn-battery discussed?

Genuine question, not a wind-up.

--
Cheers
Clive