The Western Australia (WA) government has spent $1 million on exploring the feasibility of using depleted oil and gas wells, salt caverns, and underground mines to store the vast quantities of hydrogen it plans to produce in the near future. The state which has its eyes on becoming a hydrogen-making giant and is set to host the world’s biggest facility, the Western Green Energy Hub—a 50 GW (gigawatt) renewable energy hub set to cost $95 billion and be capable of producing 3.5 million tonnes of hydrogen per year. In all, WA has around 100 GW of hydrogen-making renewable energy hubs in the pipeline over the next decade—double the roughly 50 GW in Australia’s entire stable of coal, gas, and renewable power stations. But there are few places that can store such large quantities of hydrogen in the state, an issue that has prompted the WA government to explore forms of …