IRO-006-TRE-1: IROL and SOL Mitigation in the ERCOT Region

Purpose
To provide and execute transmission loading relief procedures that can be used to mitigate SOL or IROL exceedances for the purpose of maintaining reliable operation of the bulk electric system in the ERCOT Region.

Applicability
Reliability Coordinator

Effective Date
The first day of the first calendar quarter after applicable regulatory approval.

Requirements and Measures
R1. The RC shall have procedures to identify and mitigate exceedances of identified Interconnection Reliability Operating Limits (IROL) and System Operating Limits (SOL) that will not be resolved by the automatic actions of the ERCOT Nodal market operations system. The procedures shall address, but not be limited to, one or more of the following:

  • redispatch of generation;
  • reconfiguration of the Transmission system;
  • controlled load reductions (including both firm and non-firm load shedding).

[Violation Risk Factor: Medium] [Time Horizon: Operations Planning]

M1. The RC shall provide evidence including documentation of procedures to identify and mitigate exceedances of identified IROLs and SOLs to demonstrate compliance with Requirement R1.

R2. The RC shall act to identify and mitigate exceedances of identified Interconnection Reliability Operating Limits and System Operating Limits that will not be resolved by the automatic actions of the ERCOT Nodal market operations system, in accordance with the procedures required by R1.

[Violation Risk Factor: High] [Time Horizon: Real Time Operations]

M2. To demonstrate compliance with Requirement R2, the RC shall provide evidence, such as system logs, voice recordings, or operating messages that shows that it acted to identify and to mitigate exceedances of IROLs and SOLs in accordance with the procedures required by R1.

 

Guideline and Technical Basis

Rationale: 
During development of this standard, text boxes were embedded within the standard to explain the rationale for various parts of the standard. Upon BOT approval, the text from each of the rationale text boxes was moved to this section.

Rationale for R1:
The methodology for identifying IROLs and SOLs is addressed in FAC standards, including FAC-014.

Rationale for R2:
IRO-005-2a (Requirements 3 and 5) calls for relieving IROL violations in no longer than 30 minutes.


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