> "When the frequency drops below 50Hz, it suggests that demand is outpacing supply, and vice-versa when the frequency is above 50Hz." As a former Transmission

> "When the frequency drops below 50Hz, it suggests that demand is outpacing supply, and vice-versa when the frequency is above 50Hz." As a former Transmission System Operator I can tell you the most likely scenario you see this is when generation trips offline (demand exceeds supply for a short time). I've sat in an Arizona control room, 1700MW of NW hydro would trip offline and we'd see a massive drop in interconnect frequency.