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Not so easy to make a quick getaway when it takes 3 hours to juice up your motor, eh Brits?

Roland6 Silver badge

>pumped storage is ineffecient Ffestiniog Power Station has an average efficiency of 72–73% .

But pumped storage wasn't intended to be efficient and won't be efficient because of the need to pump water from the bottom reservoir back to the top reservoir.

>battery storage is great 90%+ efficiency

I would treat this figure with caution as it is a reference to the ability to recover energy stored in the battery and not the energy needed to put that energy into the battery, nor the energy consumed in input/output voltage conversions.

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