[selfmodruntime]

As you have been reminded of in other comments, there is no "enough battery backup". These weather events aren't exactly rare either. Germany for example has on average multiple episodes of both subnormal wind and sun energy production in high-pressure systems.

[dalyons]

Did you read my comment? 10% budget for gas backup buys you 35 days, if on those days there is 0% other production (extremely unlikely). Seems pretty conservative to me?