4 ms·
Offhand impression. With thermal storage systems. Round trip efficiency numbers range from really bad at 50%. To really good at 80%. Batteries are probably 80-9
by Gibbon1 5y ago
Offhand impression. With thermal storage systems. Round trip efficiency numbers range from really bad at 50%. To really good at 80%. Batteries are probably 80-90 percent efficient.
Notably to me is that cost per mega watt hour varies a lot more than two to one. Which says to me energy storage is economically feasible using a number of different technlogies.
- rsynnott 5y agoI mean, yes. In general, the problem these systems are trying to solve is "ugh, we have too much electricity right now, why can't we use it later" (in particular, areas with a lot of wind generation often have to stop the turbines spinning). At time of storage, the energy is essentially free (or of negative value, really; in the absence of storage the excess energy is a _problem_) so efficiency of storage is much less important than facility cost per MW.