Estimates suggest abandoned mine shafts could store enough electricity to power the planet
An abandoned mine in Finland is set to be transformed into a giant battery to store renewable energy during periods of excess production.
The Pyhäsalmi Mine, roughly 450 kilometres north of Helsinki, is Europe’s deepest zinc and copper mine and holds the potential to store up to 2 MW of energy within its 1,400-metre-deep shafts.
The disused mine will be fitted with a gravity battery, which uses excess energy from renewable sources like solar and wind in order to lift a heavy weight. During periods of low production, the weight is released and used to power a turbine as it drops.
That's similar but different in a lot of meaningful ways. Hydro pumping like that requires a relatively large body of water next to a large geographical height right nearby. This new system doesn't require any water, and it uses a man made hole in the ground that's already been created and which otherwise would be simply unused
It was definitely a bad thing in "Press Your Luck", the game show where the term was coined. The "Whammy" was a little monster who took all your money.
"How to use Whammy in a sentence" 5th one down is "I love being able to sing for my job and its my passion to so it's a double whammy"
Edit: funnily enough, keep scrolling and you have the British dictionary definition and let's face it you are speaking English.
There it directly says, "something which has great, often negative, impact"
So right there in your link, it's not always negative.
I read of another it was the same physics but different scenario. I think it was like excess energy moves heavy carts up a hill. When energy is needed, these carts get released and their potential energy from hill and the basic idea of regenerative breaking to repurpose it's kinetic energy.
That’s the whole point of grid energy storage. Even if there are losses, it’s acceptable considering that otherwise you would need to burn fossil fuels in a peaker plant to keep the grid balanced. You aren’t supposed to recharge a battery like this with fossil fuels.