California ISO declares Stage 2 alert

With electricity operating reserves expected to fall below 5%, the California Independent System Operator issued a Stage Two emergency alert Wednesday, directing Southern California Edison Co. to cut its load 430 Mw.The California ISO said electric reserves continue to be in short supply from the Northwest to the Southwest as a heat wave continues to permeate the West.


With electricity operating reserves expected to fall below 5%, the California Independent System Operator issued a Stage Two emergency alert Wednesday, directing Southern California Edison Co. (SCE) to cut its load 430 Mw. It is the second day in a row the California ISO has been forced to move to a Stage Two from a Stage One alert.

The ISO said electric reserves continue to be in short supply from the Northwest to the Southwest as a heat wave continues to permeate the West.

Imported power California normally counts on from its neighbors is severely limited because their own high demand is straining the resources within those states. Unseasonably high temperatures persist today in the Pacific Northwest while Arizona and Nevada continue to swelter in the heat as well.

Peak demand on the transmission system is expected to reach 43,041 Mw by late afternoon. Earlier, the California ISO issued a Stage One alert to advise the public of potential power shortages and to ask all customers to conserve electricity to ensure there will be enough electricity to meet future demand.

But with demand still rising, SCE is curtailing power to interruptible load customers who have agreed to interruptions in exchange for lower rates.

The California ISO is chartered by the state to manage the flow of electricity along the long-distance, high-voltage power lines that make up the bulk of California's transmission system. The ISO assumed the responsibility in March 1998 when California opened its energy markets to competition and the state's investor-owned utilities turned their private transmission power lines over to the ISO to manage.

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