https://energy-charts.info/charts/price_spot_market/chart.ht...
If, it was to be from some kind of storage, Extra capacity would be needed to allow recharging of the storage
Obviously it’s possible for solar, hydro and wind farms to stop producing, but that’s what storage is for.
New Zealand is contemplating a large project (didn’t think we into infrastructure any more) which is considerably more capacity than a few hours.
https://newsroom.co.nz/2025/10/17/the-lake-onslow-pumped-hyd...
Weather fronts move across the continent on a very regular basis; when the wind dies down, the sun shines more.
https://blackout-news.de/en/news/electricity-prices-in-germa...
Nuclear power would help to solve these problems, because it isn't intermittent.