Why is the concept of pumping water uphill not commonly used as a source of electricity generation, similar to pumped-hydro systems?

There are about 4 places where they have large pumped hydroelectric storage in California. A couple...
There are about 4 places where they have large pumped hydroelectric storage in California. A couple...
AYEYY, NA’ KOMITUNA KA… [The meaning of which is, “Hmm, I’m wondering…” i.e in Lingala (Lit. Languag...
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