The article is about LDES Long-Duration Energy Storage.
(I remember learning of Google's early Bloom Box investments many years ago; instead of diesel generator reserves which expire.)
Energy Dome has a CO2 -based LDES which Google has invested in.
Energy Dome's requires compressing CO2 to supercriticality.
> [...] pumped storage hydropower still accounts for more than 90% of utility scale storage in the US, long duration or otherwise.
Additional forms of CO2 storage and capture?
- Concrete that absorbs CO2; developed with Allegro-FM AI: https://news.ycombinator.com/item?id=44677145
- Bicarbonate + CO2 + (...) => formate at 96% efficiency: https://news.ycombinator.com/item?id=38097663
/? CO2 (in my hnlog)
- Butter! "Butter made from CO2 could pave the way for food without farming" https://news.ycombinator.com/item?id=40918803