“Reactor production is limited during times of high heat to prevent the hot water re-entering rivers from damaging wildlife.”

So it’s not due to any physical limitations but an environmental protection issue.

Also in the article

“… at a time when half its reactors are offline due to maintenance and corrosion issues.”

So they are doing maintenance and found some issues requiring more work.

Why don’t they build them in cold places then? They don’t have any cold areas north? Can they build em next to glaciers before those melt too. If they all melt, we may be too dead for it to matter anyways.