Mann, Margaret; Putsche, Vicky; Shrager, Benjamin (February 24, 2022). Grid Energy Storage: Supply Chain Deep Assessment(PDF) (Report). United States Department of Energy. Retrieved August 6, 2022.
energystorage.org
"Pumped Hydropower". Energy Storage Association. Archived from the original on January 24, 2022. Retrieved November 16, 2020.
energyvault.com
"EnergyVault". EnergyVault: Enabling a Renewable World. EnergyVault. 2020.