That’s simply not true, or at least not today.

First of, the UK are investing in battery storage, there’s already a rollout of grid-level battery systems across the country*.

None of them hold capacity for longer than 2 hours before they need to start discharging. In fact, the record breaking duration is 6 hours. This is great as a short buffer, but it’s not “storage”.

To put this in perspective, last year the UK went 2 weeks without any significant wind, so a 2 hour buffer is nothing. This is why Hydrogen is still being kept as an option for long term storage.

https://stateraenergy.co.uk/projects/thurrock-storage

https://rhomotion.com/news/longest-duration-battery-energy-s...

The ratio between GW and GWh is always an optimization of the fixed costs vs potential profit.

A 4 hour battery can run at 50% for 8 hours or 25% for 16 hours.

The determining factor is what the market needs.