A giant water battery in the Alps could revolutionize energy storage

We all know we need to switch to renewable energy sources such as wind and solar power if we are to prevent a global climate catastrophe. Currently, a third of our global electricity comes from low carbon sources, but the main issue is that we still use giant batteries for storage which contain metals that contaminate ecosystems.
Emma Keeling traveled to the Swiss Alps to visit the Nant de Drance power plant that uses water to not only generate electricity again, but to store energy. This level of flexibility provides a vital solution to the issue of renewable energy storage.

[@CMZneu]

Hell yeah pump storage! Sure 80% efficiency is not the number one best but it's more than good enough given how reliable and simple it is, batteries for long term storage will get better in the future but who knows what type of rare metal it will need and the longevity of it, after all it's never gonna get better than 100% efficiency so i think 20% inefficiency is just fine for a technology that is extremely well developed and understood.

[@blackrock4fingermexicanstyle]

5:45 comes water right out the wall ?????