The Australian solar tech that may have found a low cost solution to deep storage

https://reneweconomy.com.au/the-australian-solar-tech-that-may-have-found-a-low-cost-solution-to-deep-storage/

"Raygen: off the shelf organic Rankine cycle turbines, chiller systems and pit storage... easier and cheaper using low temperatures... bird safe... lowest cost firming and dispatchable renewable energy... split into 30MW blocks, with 30 towers and their attendant heliostats, sharing hot and cold water storage, 90°C temperature difference... 4MW and 51MWh, with 3MW connection to grid... round trip efficiency 70% (low thermal/ high electrical efficiency), equivalent to pumped hydro, 1 MW into chiller and 0.7 dispatched"

Related: Successful PROMES-CNRS thermocline test of latent/sensible heat storage
https://www.solarpaces.org/successful-promes-cnrs-thermocline-latent-sensible-heat-storage/