>
A custom-bred form of bacteriaNitpicking: It's an archaea, they are very similar if you are not a biologist anyway.
> converts carbon dioxide and hydrogen into methane.
The main problem is that you need energy to produce the hydrogen, the relevant part of the article is:
> For every unit of energy of electricity fed into the system, it produces about 0.75 units of energy stored in the form of methane, according to Doris Hafenbradl, Electrochaea’s chief scientist. That’s not as good as lithium-ion batteries, which can reach near 100% efficiency. But unlike the energy stored in batteries, once methane is produced it can be stored indefinitely, because it doesn’t spontaneously degrade into other chemicals.
So there is at least a 25% loose in the storage.
