One worth mentioning in this context is the Western Sydney Pumped Hydro Project. It sounds like a no-brainer. It uses the existing Lake Burragorang (formed by

One worth mentioning in this context is the Western Sydney Pumped Hydro Project. It sounds like a no-brainer. It uses the existing Lake Burragorang (formed by Warragamba Dam) and an existing hole with infrastructure at the old Wollondilly Coal Washery, 400m above the lake and 3.1km from it. It will offer 8GWh of storage, close to Sydney, basically for the effort of digging a 3.5km tunnel and installing turbines. https://www.waternsw.com.au/water-services/renewable-energy-and-storage-program/Western-Sydney-Pumped-Hydro-Project https://www.waternsw.com.au/water-services/renewable-energy-... To their credit, Sydney Water has a range of projects based on adding pumped hydro to exiting dams, of which the above is one. Total storage capacity of projects announced to date is 25GWh. They seem ideal for firming rooftop solar around Sydney/Newcastle/Wollongong. https://www.waternsw.com.au/water-services/renewable-energy-and-storage-program https://www.waternsw.com.au/water-services/renewable-energy-...