Brazil grid operator curtails generation amid 'solar cat' distributed PV surge

Brazil's ONS ordered two emergency curtailments between June and early September due to excess supply in the national grid, with sector participants blaming unregistered 'solar cats'—informal distributed-generation solar installations. The episode highlights growing grid-integration stress from rapid rooftop PV growth and regulatory gaps. Uncertainty remains over the scale of unregistered capacity and whether curtailment will recur.