Power outages can result from planned events, like a rolling blackout, or unplanned incidents, such as severe weather or traffic accidents. Periods of high power usage, often experienced during summer and winter months, can result in planned rolling outages. During these times, consumers and businesses may be asked to reduce electricity use during peak electricity hours.
A power watch will be issued when conservation is needed for a certain period of time. These can be issued when temperatures are expected to be extremely high or low and when unexpected generation outages appear.
A power warning will be issued when conservation is critical to avoid rolling outages which could lead to uncontrollable blackouts.