> you need to plan for the absolute worst case, once in a century, scenario and size your batteries accordingly.
For a once-in-a-century situation, you can have alternatives other than batteries. For instance, backup diesel generators; any extra CO2 emitted by them in that situation would be insignificant when spread over a hundred years. And once you're planning for once-in-a-century events, you need backup generators anyway, since you can have failures other than just cloudy windless weather.
For a once-in-a-century situation, you can have alternatives other than batteries. For instance, backup diesel generators; any extra CO2 emitted by them in that situation would be insignificant when spread over a hundred years. And once you're planning for once-in-a-century events, you need backup generators anyway, since you can have failures other than just cloudy windless weather.