“At present, the Shoalhaven project typically uses cheap baseload coal power during the night, at perhaps $30-$40 a megawatt-hour to shift water back up to the top reservoir at Fitzroy Falls, then generates power at perhaps $140/MWh during peak demand, perhaps in the early evening.”
https://www.copyright link/business/energy/hydro-energy/origin-energy-keen-to-double-nsw-pumped-hydro-project-20180506-h0zpgr