You’re completely right. But I suppose @Renohren@lemmy.today was thinking of using the battery and solar panels for personal use in case the grid is down. Which in theory is possible but afaik it requires additional measures, just having the battery and solar panels installed doesn’t mean your fridge will work without the grid.
Good point. In the Netherlands there are tests being done with ultra fast batteries to take over the grid forming properties of ‘large spinny things’. See: https://www.rwe.com/en/press/rwe-generation/2024-09-09-rwe-builds-ultra-fast-innovative-battery-storage-system-in-the-netherlands/
But saying that this power outage is caused by it is speculation at this point.
No it’s good for the energy transition of you get solar+battery, especially if you’re in France. Sellers of these systems often promise you a return on investment based on historical data. Be aware though that due to the energy transition business cases can quickly develop unexpectedly. You’re taking on risk.