PJM issues electricity alert

For the third day in a row Thursday, the PJM Interconnection LLC, the grid operator for the US Mid-Atlantic states and Washington, DC, issued a power alert, putting customers on notice emergency procedures could be required later in the day, as high temperatures persist across the region. Wednesday the independent system operator issued load dump warning for the southern Delmarva Peninsula Wednesday, warning of potential power supply shortage from Oak Hall south to Bayview.


For the third day in a row Thursday, the PJM Interconnection LLC, the grid operator for the US Mid-Atlantic states and Washington, DC, issued a power alert, putting customers on notice emergency procedures could be required later in the day, as high temperatures persist across the region.

Wednesday the independent system operator issued a load dump warning for the southern Delmarva Peninsula warning of potential power supply shortage from Oak Hall south to Bayview.

It said all available generation, up to and including maximum emergency power, has been brought on to control the constraint Wednesday. A voltage reduction would have little or no effect on the constraint, PJM reported.

PJM issues a manual load dump warning when available primary reserve capacity is less than the largest operating generator or the loss of a transmission facility jeopardizes reliable operation after all other possible measures have been taken to increase reserves.

Temperatures in the Pennsylvania-New Jersey-Maryland (PJM) were forecast to be in the mid-90� F. range. Wednesday a spokeswoman said loads were forecast to touch 50,000 Mw in the region but at 4 p.m. EST demand was tracking just under that amount. She declined to say if generation or transmission problems touched off the alert.

However, she said, the grid operator did not have to call upon interruptible load customers to reduce usage.

The system operator issued a similar warning Tuesday after PECO Energy's 1,100 Mw Peach Bottom 3 was taken off line but called it off without having to implement emergency procedures.

PJM currently administers almost 8% of the US's electric power, with a pooled generating capacity of over 58,000 Mw and a membership of more than 190.

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