Meanwhile the US only increased capacity in pumped hydroelectric by 2.1 Gw between 2010-2022 for a whopping 22 Gw total capacity. Hydroelectric generally hovers about 28% of total renewable energy electricity generation.

The biggest problem (in the US) has been a lack of investment in new pumped hydroelectric projects not connected to improving existing dam infrastructure. Permitting huge new projects but smaller is unattractive unless it is geographically/geologically favorable like with most of the new sites being planned in California and Arizona.