making cell mass using carbon dioxide and electricity

https://phys.org/news/2025-01-dual-reactor-consumable-cell-protein.html
These researchers are using two types of bacteria to produce "consumable single-cell protein".  It looks like they use an acetate producing bacteria and feed it with CO2 and Hydrogen.  They make the hydrogen by splitting water with electricity (Oxygen gets expelled and hydrogen goes into the growth medium).  They feed the acetate medium into another culture of bacteria that can utilize acetate.
The system uses electricity, so you have to factor in the amount of CO2 produced in order to make that electricity.  Solar power and wind turbines produce a lot of CO2 in their manufacture.
Using photosynthesis is likely more efficient in CO2 production, but it may be that CO2 utilization is more efficient in producing acetate than the low efficiency of RUBISCO in photosynthesis.  RUBISCO is the most abundant protein on earth because it is so inefficient in carbon capture.
Ron Okimoto