RE: Why more storage is needed9 Jun 2025 15:57
We definitely need more storage, but I'm not convinced that battery storage is going to solve the windfarm problem.
Batteries need frequent cycling to make money, and the obvious cycles that match with industrial and domestic usage are daily and intraday. You can just about argue that their is a lopsided cycle which is weekdays versus weekends, but there isn't an obvious weeks-long or monthly cycle. The only next cycle that comes to mind is seasonal, but that's a whole different kettle of fish for storage.
Anyway, the point is that designing a battery system to meet daily or intraday cycles (6-12 hour charge/discharge max) means that it matches well with solar that has a daytime charge and nighttime discharge built in. The same cannot be said for windpower which can blow continuously for days on end. Once your battery is fully charged in 6 hours you've got no slot available for discharge and you can't absorb any more of the excess either. So we're going to have constraints on wind for a while yet until they solve either the distribution problem or match the excess power with some other sort of storage or usage (hydro; electrolysis; or data-centre).
The zonal pricing isn't even going to solve the problem. It'll disguise it for a few years, but by around 2030 we'll be back were we are now as even more windfarms become operational and there is no additional local demand to be encouraged onstream. There is a limit to how many washing machines, tumble dryers and EVs that can be plugged in in a local area and the windfarms will always eventually overrun them as they are by design intended for national power delivery not local.
Fortunately the 'powers that be' haven't worked any of this out yet and can only see batteries as the storage solution, so I'm massively invested in IES. Looking forward to this afternoon's presentation.