misterbleepy, thanks for the post. Truly a massive energy-storage and power-generating system. It took them over ten years to build and become operational, probably at an astronomical price. 75% efficient, but interesting that they can get a generator on-line in only ten seconds.
Only three such sites in the UK.
Musing, as a contrast, a similar-capacity battery storage system (if enough battery cells were available) would -
1. Cost how much?
2. Consume how much surface area or volume?
3. Recurring cost, both maintenance and capital replacement?
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