Market Participants:

> On Friday August 25th, and Monday August 28th, the California ISO will be
> performing communication upgrades which will affect telephone
> communications with both the Alhambra and Folsom Control Rooms. During
> this work, all inbound and outbound service to the ISO's primary telephone
> system will be out of service. All inbound and outbound communications
> during the periods specified below must be made through the ISO's
> secondary telephone system. The schedule for this work is as follows:
>
> On Friday August 25th between 18:00 and 24:00 the Alhambra primary
> telephone system will be out of service.
>
> Monday August 28th starting at 18:30 and continuing through August 29th at
> 02:30 the Folsom primary telephone system will be out of service.
>
> During these periods, you must use phone numbers applicable to the ISO's
> secondary telephone system to reach the ISO Control Rooms and ISO staff
> will use your secondary system telephone numbers to reach you.
>
> During the scheduled primary phone outage the ISO can be reached at the
> following back up phone numbers:
>
> ALHAMBRA
> Generation Desk (Console 5) - (626) 299-4428 through 4431 (Lines 1-4).
> Transmission Spare Desk (Console 1) - (626) 299-4424 through 4427 (Lines
> 1-4).
> Transmission Center Desk (Console 2 ) - (626) 299-4404 through 4407 (Lines
> 1-4).
> Transmission Desk (Console 3) - (626) 299-4412 through 4415 (Lines 1-4).
>  Scheduler 1 Desk (Console 4) - (626) 299-4464 through 4467 (Lines 1-4).
> Scheduler 2 Desk (Console 6) - (626) 299-4460 through 4463 (Lines 1-4).
> Shift Manager Desk (Console 7) - (626) 299-4416 through 4419 (Lines 1-4).
> B.E.E.P. Desk (Console 8) - (626) 299-4474 through 4477 (Lines 1-4).
>
> FOLSOM
> Shift Manager - (916) 351-5512 through 5514
> Security Coordinator - (916) 351-5542, 5543
> Generation Desk 1 - (916) 351-5520 through 5523
> Generation Desk 2 - (916) 351-5536 through 5539
>
> Beep Desk - (916) 351-5508 through 5511
> Transmission Desk 1 - (916) 351-5546, 5547
> Transmission Desk 2 - (916) 351-5550, 5551
> Scheduler COI - (916) 351-5534, 5535
> Scheduler DC - (916) 351-5530, 5531
> Hour Ahead - (916) 351-5517 through 5519
>
> Byron Woertz
> Director, Client Relations
>