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Lessons Learned

As part of its facilitation of a learning environment, Texas Reliability Entity, Inc. (Texas RE) develops and disseminates lessons learned from events, compliance processes, dismissals, and trends to the industry within the Electric Reliability Council of Texas (ERCOT) region. Lessons learned and event observations are posted below.

If stakeholders have lessons learned they would like to share with the industry, please send them to information@texasre.org External Link.

Disclaimer: The sole purpose of the lessons learned and observations is to convey guidance through illustrative examples from Texas RE’s various activities. It is not intended to nor does it create, modify, or in any way alter any NERC Reliability Standard or any obligation of a registered entity or Texas RE. Texas RE will continue to assess compliance based on the facts and circumstances of a given situation as applied to the relevant NERC Reliability Standard. The lessons learned and observations are not intended to define the exclusive method by which an entity may comply with a particular standard or requirement, or foreclose a Registered Entity's demonstration of compliance by alternative means.  Implementation of any suggestions or recommendations in this document does not, in and of itself, guarantee compliance with any NERC Reliability Standard.  Rather, each Registered Entity is responsible for assessing and taking all necessary actions to establish compliance with all of the requirements of all applicable NERC Reliability Standards.

Las Cimas
DOCUMENTS
Texas RE Event Observation - Outage Coordination Error Leads to Load Loss
(Oct 07, 2014 , .pdf, 386 KB)

Texas RE Event Observation - Misoperations Lead to Multiple Element Loss
(Oct 07, 2014 , .pdf, 396 KB)

Texas RE Event Observation - Low SF6 Trip Logic Leads to Inadvertent Trips
(Oct 07, 2014 , .pdf, 257 KB)

Texas RE Event Observation - Generator Instrument Air Failures
(Oct 07, 2014 , .pdf, 291 KB)

Third Quarter 2012 Lessons Learned from Enforcement Dismissals
Lessons learned from Enforcement dismissals from July - September 2012. Standards addressed include: CIP-001-1, CIP-004-1, CIP-006-1, and PRC-005.
(Dec 20, 2012 , .pdf, 259 KB)

Second Quarter 2012 Lessons Learned From Enforcement Dismissals
Lessons learned from dismissals of the following standards: PRC-011-0, R1; CIP-007-3, R1; PRC-001-1, R5; VAR-002-1.1B, R1
(Aug 31, 2012 , .pdf, 173 KB)

First Quarter 2012 Lessons Learned from Enforcement Dismissals
Lessons learned from Enforcement dismissals from January - March 2012. Standards addressed include CIP-001, CIP-003, CIP-007, CIP-009, IRO-001, PRC-005 and PRC-017.
(Jun 07, 2012 , .pdf, 223 KB)

Lessons Learned from the September 8, 2011 Southern California/Arizona Event
On Sept 8, 2011, an eleven minute system disturbance resulted in cascading outages across Arizona and Southern California leaving approximately 2.7 million customers without power. The following document are lessons learned from that event.
(Jun 01, 2012 , .pdf, 1039 KB)

2011 2nd Quarter - Possible Violations Received by Standard
Graph of all possible violations received in the second quarter of 2011 by standard.
(Jul 22, 2011 , .pdf, 82 KB)

2011 1st Quarter - Possible Violations Received by Standard
Graph of all possible violations received in the first quarter of 2011 by standard.
(Jul 22, 2011 , .pdf, 87 KB)

Event Observation - Combined Cycle Trips Due to Lean Combustion
Multiple issues have been reported with combined cycle unit trips while operating at or near minimum load when a frequency disturbance occurs.
(Jul 01, 2011 , .pdf, 269 KB)

Event Observation - EEA Load Shed
Registered Entities implemented rolling blackouts in response to directives issued by the Reliability Coordinator (RC) during an Energy Emergency Alert (EEA) event.
(Jul 13, 2011 , .pdf, 255 KB)

Event Observations - February 2, 2011 Winter Weather Event
Observations from the February 2, 2011 winter weather event
(Jul 01, 2011 , .pdf, 319 KB)

Event Observation - Generator Step-Up High Side Switch Failure
The failure of a generator step-up transformer high-side disconnect phase connection caused the generator to be taken off line.
(Jul 01, 2011 , .pdf, 375 KB)

Event Observation - Generator Step-Up High Side Switch Moisture Ingress
The failure of a generator step-up transformer high-side disconnect phase connection caused the generator to be taken off line.
(Jul 01, 2011 , .pdf, 339 KB)

Event Observation - Generator Trip Due to Low Auxiliary Bus Voltage
A close-in line fault caused a generating station to run back and trip due to low voltage on the station auxiliary bus.
(Jul 01, 2011 , .pdf, 258 KB)

Event Observation - WGR Trip Due to Firmware Upgrade
On several occasions, a Wind-Generation Resource (WGR) experienced issues with drivetrain oscillations in the ERCOT region.
(Jul 01, 2011 , .pdf, 266 KB)
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