"This giant bubble on the island of Sardinia holds 2,000 tonnes of carbon dioxide. But the gas wasn’t captured from factory emissions, nor was it pulled from the air. It came from a gas supplier… “The facility compresses and expands CO2 daily in its closed system, turning a turbine that generates 200 megawatt-hours of electricity, or 20 MW over 10 hours.”
This concept was started 3-5 years ago, when retail batteries where $500/kwh. They are now under $100/kwh. Concept is worthwhile for diversification of resources and talent.
There’s not enough minable copper or lithium to make all of the batteries we will need. So e alternatives will have to emerge if we are to reduce the need for generating power on demand with fuels.