this post was submitted on 22 Dec 2025
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"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."

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[–] Chippys_mittens@lemmy.world 8 points 21 hours ago* (last edited 19 hours ago) (2 children)

You understand this isnt about a new way to generate electricity right? This is about a new way to store it. The generation side of these is tiny and it's a closed loop system. The CO2 is in a CLOSED LOOP system meaning its not going to be leaching into the atmosphere. The issue with many renewables is they can't operate well in swings. Thats why electricity price is constantly fluctuating, because the demand is. So a sustainable way to store renewable generated energy will be able to accommodate those swings in demand in a way plain solar panels/wind/hydro alone can't. The CO2 is likely harvested directly from the atmosphere. Once the battery has X amount of CO2 it no longer needs more because again, its a closed loop. Clearly you have issues politically with the company, that can't be helped. But you don't know what you're talking about.

Edit- the CO2 COULD be harvested from the atmosphere using DAC. The currently used CO2 is coming from an unnamed company with no clearly stated source. Industrial CO2 mostly comes from the creation of hydrogen and ammonia, both chemicals we NEED to survive. The excess very pure CO2 from this process is the majority of what is considered globally as "industrial CO2". So, a waste product is being used that would otherwise be released to the atmosphere, used in industry or stored.

[–] lightnsfw@reddthat.com 2 points 21 hours ago (1 children)

The CO2 is likely harvested directly from the atmosphere.

What makes you think that? I just did a little googling and didn't find a source that commercial co2 comes from the air. The best case scenario I found was it being a byproduct of other processes. Although I'm doing this on my phone so maybe I missed something.

[–] Chippys_mittens@lemmy.world 4 points 20 hours ago* (last edited 20 hours ago)

A process called DAC (Direct Air Capture) is currently used on medium scale to do this. Other instances in which they obtain CO2 is by capturing byproduct of industrial processes (the biggest and most pure being from hydrogen/ammonia production) or power plants. Again though, and I dont think this is sinking in, it is a closed loop system. So, once enough CO2 is captured, thats all that battery will ever need. Its not using new fuel to create more co2 it's taking a specific amount from currently available, filling the battery ONCE then process over.