NOTICE DATE:  December 1, 2017

NOTICE TYPE:  W-C120117-01 Operations

SHORT DESCRIPTION:  2018 Winter and Spring Voltage Profiles

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  December 1, 2017

LONG DESCRIPTION:  ERCOT has posted the 2018 Winter (December 1, 2017 – February 28, 2018) and spring (March 1, 2018 – May 31, 2018) Voltage Profiles, which include set points 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 several meetings. 

All NERC-registered Generator Operators are hereby directed to coordinate with their respective TSP to comply with their specific set point in the Voltage Profile.  In accordance with ERCOT Nodal Operating Guide Section 2.7.3.5(4), Resource Entity Responsibilities and Generation Resource Requirements, a Resource Entity required to provide Voltage Support Service (VSS) must maintain the generator voltage or Reactive Power schedule within 2% of the set point identified in the Voltage Profile when operating at less than the maximum reactive capability of the Generation Resource, except under Force Majeure Events or unless explicitly authorized by or requested by ERCOT or the interconnecting Transmission Operator (TO).  Also, in accordance with Protocols Section 3.15.3, Generation Resource Requirements Related to Voltage Support, each Generation Resource must be operated in automatic voltage control mode and at the set point in the posted Voltage Profile, except as provided therein.  A QSE should immediately notify ERCOT and the interconnected TSP if its Generation Resource cannot operate within 2% of the set point identified in the assigned Voltage Profile or alternate voltage set point directed by the interconnected TSP or ERCOT.

In accordance with NERC Reliability Standard VAR-001-4.1 R5, the spreadsheet posted on the Market Information System (MIS) lists voltage set points for every Generation Resource at its POI in columns (G, K) and (V, Z). Voltage set points at the high side of the step-up transformer are listed in columns (L, N) and (AA, AC).

The Seasonal Voltage Profile Studies for Winter and Spring 2018 (EMIL ID NP3-151-M, Report Type ID 13262) can be accessed on the Groups and Rules/Transmission Service Provider Information page on the MIS. A Digital Certificate is required to access the MIS.

ADDITIONAL INFORMATION:  Information regarding the 2018 Winter and Spring Voltage Profiles can be found on the ERCOT Market Information System (MIS) under Voltage Profiles (EMIL ID ZP6-303-M, Report ID 11452) 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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