NOTICE DATE:  December 1, 2014

NOTICE TYPE:  W-A120114-01 Operations

SHORT DESCRIPTION:  2015 Winter Spring Voltage Profiles

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  December 1, 2014

LONG DESCRIPTION:  ERCOT has posted the 2015 Winter and Spring Voltage Profile for each Generation Resource Point of Interconnection (POI).  ERCOT and the Transmission Service Providers (TSPs) derived these Voltage Profiles after a series of joint studies and one meeting. 

All NERC Registered Generator Operators are hereby directed to comply with the Voltage Profile in automatic voltage control mode.  In accordance with ERCOT Operating Guide Section 2.7.4.1, Maintaining System Voltage, Generation Resources required to provide VSS must maintain transmission system voltage at the POI within 2% of the Voltage Profile when operating at less than the maximum reactive capability of the Generation Resource.  Also, in accordance with Protocols Section 3.15.3, QSE Responsibilities Related to Voltage Support, each QSE must operate its Generation Resources in automatic voltage control mode and at the posted Voltage Profile unless otherwise directed by the interconnected TSP or ERCOT.  A QSE should immediately notify ERCOT and the interconnected TSP if its Generation Resource cannot operate within 2% of the assigned Voltage Profile or alternate voltage schedule directed by the interconnected TSP or ERCOT.

In accordance with NERC Reliability Standard VAR-001-4 R5, the Voltage Profile spreadsheet posted on the Market Information System (MIS) also identifies those Generation Resources whose POI is not located at the high side of the step-up transformer (Columns L, M, T and U).  For these Generators, the Voltage Profile is assigned to the high side of the step-up transformer.

The Voltage Profiles for the Generation Resources can be accessed on the MIS. A Digital Certificate is required to access the MIS.

ADDITIONAL INFORMATION:  Information regarding 2015 Winter Spring Voltage Profiles can be found on the ERCOT Market Information System (MIS) under Voltage Profiles on the Grid/Transmission page.  A Digital Certificate is required to access the MIS.

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].

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