GigaOm provides a useful overview, noting “pumped storage is currently the dominant—and nearly only—grid-scale storage solution out there,” then extrapolates into just how much pumped hydro storage there could be and what it would entail.
Politics in the Zeros
"A republic, if you can keep it." Defeat MAGA
Politics in the Zeros
"A republic, if you can keep it." Defeat MAGA