News for hackers. Stuff that matters.

A comment on CO2 Batteries That Store Grid Energy Take Off Globally. Parent comment

Re:CO2 Batteries That Store Grid Energy Take Off Globally by 2thumbsup on Sunday December 21, 2025 @05:32PM (#46349265)
A few hours are sometimes enough to start generators when renewable energy supply decreases. Obviously, the more capacity the better, but costs will increase linearly with capacity in most cases.

Pumped-storage hydroelectricity - where it is feasible - is the only kind of energy storage close to "months".

[ Parent | on HN ]
Re:CO2 Batteries That Store Grid Energy Take Off Globally by pfdietz on Sunday December 21, 2025 @07:38PM (#46350138)
Oh: pumped hydro is not a "months" storage technology. The capex per unit of storage capacity is far too high.
[ Parent | on HN ]
Re:CO2 Batteries That Store Grid Energy Take Off Globally by ifwinterco on Sunday December 21, 2025 @05:44PM (#46349368)
You can store energy for months pretty easily as chemical energy. Just get some hydrogen, then join it to something else, maybe carbon, in the right proportion so it's a liquid at room temperature making it nice and easy to both store and transport.

Wait a minute...

[ Parent | on HN ]
Re:CO2 Batteries That Store Grid Energy Take Off Globally by pfdietz on Sunday December 21, 2025 @05:35PM (#46349300)
The point is that's already a well-served market. These competitors are like alternative semiconductors going up against silicon.
[ Parent | on HN ]