NOTICE DATE: September 17, 2015
NOTICE TYPE: W-A091715-01 Operations
SHORT DESCRIPTION: Annual Stability limit and IROL communication
INTENDED AUDIENCE: Transmission Owners, Generation Owners, Transmission Operators, Generator Operators, Transmission Planners
DAY AFFECTED: September 17, 2015
LONG DESCRIPTION: ERCOT reviewed operating limits for 2015 that are stability limits and or that meet the criteria of an Interconnection Reliability Operating Limit (IROL) in accordance with the ERCOT System Operating Limit (SOL) Methodology for the Planning and Operations Horizon.
There are no stability related limits or IROLs that have been identified for the Planning Horizon based on studies completed in 2014.
There are 4 stability related limits that have been identified for the Operations Horizon which are represented by the following Generic Transmission Constraints (GTCs).
2015 GTCs/Non-IROL:
GTCs / Non-IROL
Affected ERCOT Transmission Operators
Valley Import
American Electric Power,
South Texas Electric Co-op,
Brownsville Public Utility Board,
Sharyland Utilities
Zorillo to Ajo
American Electric Power
Laredo
American Electric Power
Panhandle
American Electric Power,
ONCOR,
Wind Energy Transmission of Texas (WETT),
Cross Texas Transmission,
Sharyland Utilities
There is one Generic Transmission Constraint (GTC) that meets the criteria of an IROL for the Operations Horizon.
2015 GTC/IROLs:
GTC/IROL Name
Affected ERCOT Transmission Operators
North-Houston Voltage Stability Limit
CenterPoint Energy
If a GTC and or an IROL affects your facilities or operating area, ERCOT will be following up with additional details and coordination within the next 30 days. ERCOT has not identified any other affected entities at the time of this communication. Any new GTCs that are created due to necessity before the next annual review will be directly communicated to the affected entities. For any IROL affected ERCOT Transmission Operators, please consider this as affirmative notice of your need to consider the IROL-related assets under your NERC Critical Infrastructure Protection (CIP) program. Please refer to CIP-002-5, Requirement R1 and Attachment 1, sections 2.6 and 2.9.
CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via email at [log in to unmask]<mailto:[log in to unmask]>.
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