"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.”
They don’t want working energy storage. That’s why there are so many fairy dust projects like nuclear fusion.
And on the other hand, there are well-proven established techniques like heat pumps, PV panels, Lithium batteries, electric cars, high voltage DC power lines, and seasonal heat storage. Which should be built and used at a large scale because they work - but aren’t.