Bonneville Power Administration
Transmission Services
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BPA Home Transmission Services Business Reserve and Schedule Transmission Transmission System Events

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Transmission System Events Listed below are the unplanned or urgent events that may currently be impacting the BPA Transmission System. Time Description 11/23/2006 06:28 hrs On 22NOV06 the Sacajawea 500/115kV transformer relayed out of service. ETR unknown. Local generation restrictions are in place for this outage. 10/14/2007 22:49 hrs BPA is implementing a newly developed automated procedure that will calculate curtailments of transmission schedules in the Puget Sound area and Northern Intertie (PSANI). This procedure will become effective at 0001Hrs. on Monday, October 15, 2007. 06/30/2008 19:11 hrs Bonneville Power Administration is experiencing high flows on the Columbia and Snake River systems. BPA is unable to lower the generation output of its powerhouses to a level that would cause the spill levels on the lower Columbia that would cause us to exceed the gas saturation limits. BPA has had to order some wind generation to decrease output to the scheduled value due to this condition. This condition will likely persist through the weekend of July 4 and if the schedules for the wind generation are too far off the actual generation, BPA will have to call on the wind generation to decrease output to schedules again. 07/24/2008 09:38 hrs Columbia Injection exceeded Level 1 nomogram and mitigation is anticipated per established procedures. 07/25/2008 12:05 hrs Columbia Injection exceeded Level 1 nomogram and mitigation is anticipated per established procedures. 07/28/2008 11:21 hrs Columbia Injection exceeded Level 1 nomogram and mitigation is anticipated per established procedures. 07/31/2008 18:30 hrs 1830 PDT: BPA will be removing the Sickler 500/230kV transformer from service for maintenance from 1200hrs on August 1st through 1100hrs on August 4th. BPA is anticipating that this outage will result in a substantial reduction to the Columbia Injection OTC. BPA will follow normal mitigation procedures should the Columbia Injection flows exceed the OTC. 08/03/2008 16:26 hrs BPA'S SICKLER 500/230KV TRANSFORMER BANK #1 OUTAGE HAS BEEN EXTENDED THROUGH AUGUST 5TH, ETR 1100HRS. COLUMBIA INJECTION OTC WILL CONTINUE TO BE SUBSTANTIALLY REDUCED DUE TO THIS OUTAGE. BPA WILL CONTINUE TO FOLLOW NORMAL MITIGATION PROCEDURES IF COLUMBIA INJECTION FLOWS EXCEED THE OTC. 08/04/2008 12:49 hrs Columbia Injection exceeded Level 1 nomogram and mitigation is anticipated per established procedures. 08/07/2008 15:10 hrs South of Allston Flowgate actual flows are currently exceeding the nomogram OTC. BPA has initiated estiablished mitigation procedures.