PDCI Derate for 8/21/01

Market Notification: After the Day-Ahead Market closed, PDCI TTC N-S was
changed from 2525 to 1757 MW and S-N was changed from 1904 MW to 1705 MW
starting HE01 for operating day 08/21/01. This was due to unavailability of
the BPA Celilo Valve Group #8. The first applicable hour to run with the
adjusted rating in the Hour-Ahead Market is HE05 for 08/21/01. Inquiries
please call (916) 351-4409. Please address real-time operational inquiries
to the Real-Time scheduling desk at (916) 351-2493.

The system conditions described in this communication are dynamic and
subject to change. While the ISO has attempted to reflect the most current,
accurate information available in preparing this notice, system conditions
may change suddenly with little or no notice.