We never have been 100% renewable in the UK. It’s more that we go into surplus and shutting generators down is more expensive than the price going negative. Hence we won’t get huge negative prices. Connectors to other countries can only export so much.
It also only happens when:
- long term weather forecast underestimated weather based generation.
- demand is low. (E.g. weekend and public holidays)
The population of Germany is only 25% bigger than the UK, so I think the two are comparable. A larger manufacturing base will make the demand-side curve more predictable though. Still, we’re largely talking about the effect of supply unpredictability.
I don’t understand how you think the smaller coupon gets more volume. It gets no volume as the hypothetically “good honey” redirects everyone away from it.