Three Stages Of Power Alerts
Posted: 9:57 am PDT July 24, 2006Updated: 9:59 am PDT July 24, 2006
The three stages of power emergency alerts are:
- Stage 1: Voluntarily reduce energy use throughout the day. A Stage 1 alert means that electricity reserves in the state have fallen below 7%, possibly because of isolated generation outages, projected high temperatures that create a high demand for electricity, or breaks or other trouble that could limit transmission capability. There should not be an interruption of service to customers in a Stage 1 alert.
- Stage 2: Customers who have special interruptible rate contracts are mandated to have service interrupted in order to avoid more severe conditions. A Stage 2 alert indicates that electricity reserves in the state have fallen below 5% and protective actions are required by the (ISO).
- Stage 3: Mandatory curtailments are exercised and controlled rolling blackouts may be used to maintain system stability. This level of alert is the most severe and signals that electricity reserves in the state have fallen below 1.5%. Substantial voluntary reductions in loads from customers may shorten the severity and duration of utility controlled rolling blackouts
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