These sources discuss the recent widespread power outage in Spain and Portugal, with some impact on southern France. Initial reports from the Portuguese grid operator mention a "rare atmospheric phenomenon" involving extreme temperature variations causing "induced atmospheric vibration" in high-voltage lines, leading to synchronization failures. Experts offer differing perspectives on this explanation, with some noting the complexity of interconnected power grids and the possibility of cascading failures from various causes, while others are unfamiliar with the specific term "induced atmospheric vibration" in power system engineering. The sources highlight that restoration of power to a large, interconnected grid can take several hours or days and that incidents of this magnitude, though rare, underscore the need for robust grid management and infrastructure investment, especially as systems integrate more renewable energy and face changing environmental conditions.