Operational System Change Schedule

The table below represents a schedule of planned updates to the ERCOT Operational System or Energy Management System (EMS).  Each row of dates is in support of a planned EMS database load (column 4).  This calendar is applicable to all network topology and telemetry changes submitted by transmission service providers (TSP), resource entities (RE), and qualified scheduling entities (QSE).

Generation Cut-Off [Changes to Existing Resources]:  This date is the cut-off for REs to have resource registration changes of existing resources for network topology in by to assure successful incorporation into the associated EMS database load date. 

Generation Cut-Off [NEW Resources]:  The Generation Cut-Off date below does not apply for new generation.  ERCOT request that registration of a NEW resource to submitted no later than 50 days prior to the first operating day of the interconnection.  Refer to “New Generation Resources – Steps to Register” page for further details.   

Transmission Cut-Off:  This date is the ideal date for TSPs to have transmission network topology changes in by to assure successful incorporation into the associated EMS database load date.  

Telemetry Points Cut-Off:  ERCOT request that all telemetry point changes be submitted for both resources and transmission elements by this cut-off date in order to assure changes are incorporated in the associated EMS database load date.

QSE NDCRC Submittals: The Net Dependable Capability and Reactive Capability (NDCRC) application allows Qualified Scheduling Entities (QSEs) with Generation Resources to submit the ERCOT required seasonal High Sustained Limit (HSL), biennial unit reactive tests and results of the unannounced tests online and other test data. In regards to seasonal HSLs, NDCRC submittals must be made no later than two business days prior to the database load to be included in the subsequent batch-load files for the scheduled load.

The resource entity (RE) and associated qualified scheduling entity (QSE) are encouraged to coordinate changes in relationships according to the posted schedule.  A change in the operations system is required to establish the operational relationship between QSE and generation resource in ERCOT's EMS.  The RE and QSE are asked to consider the Operational System Change Schedule below when establishing an effective date when NEW resource interconnection is first energized, new QSE representing resources, and Resource changing QSE.  For NEW resources allow 7 days from EMS Database Load date and date the interconnection is approved to energize.

Market Participants setting up a new QSE representing resources nee d to plan across two EMS database load dates to accommodate the new QSE (or subordinate QSE).  The first database load is used to set up the new QSE in EMS and the second database load is used to map resource(s) and telemetry in the EMS.

Generation
Cut-Off

Transmission
Cut-Off

Telemetry Points Cut-Off

EMS Database
Load Date

Company Holidays

Tue 15-Dec

Mon 28-Dec

Mon 04-Jan

Wed 06-Jan

Fri 01-Jan

Thu 07-Jan

Mon 11-Jan

Mon 18-Jan

Wed 20-Jan

 

Thu 21-Jan

Thu 21-Jan

Thu 28-Jan

Mon 01-Feb

 

Tue 02-Feb

Mon 08-Feb

Mon 15-Feb

Wed 17-Feb

 

Thu 18-Feb

Mon 22-Feb

Mon 01-Mar

Wed 03-Mar

 

Thu 04-Mar

Mon 08-Mar

Mon 15-Mar

Wed 17-Mar

 

Thu 18-Mar

Tue 23-Mar

Tue 30-Mar

Thu 01-Apr

 

Fri 02-Apr

Mon 05-Apr

Mon 12-Apr

Wed 14-Apr

 

Thu 15-Apr

Thu 22-Apr

Thu 29-Apr

Mon 03-May

 

Tue 04-May

Mon 10-May

Mon 17-May

Wed 19-May

 

Thu 20-May

Thu 20-May

Wed 26-May

Tue 01-Jun

Mon 31-May

Wed 02-Jun

Mon 07-Jun

Mon 14-Jun

Wed 16-Jun

 

Thu 17-Jun

Tue 22-Jun

Tue 29-Jun

Thu 01-Jul

 

Fri 02-Jul

Fri 02-Jul

Mon 12-Jul

Wed 14-Jul

Mon 05-Jul

Thu 15-Jul

Thu 22-Jul

Thu 29-Jul

Mon 02-Aug

 

Tue 03-Aug

Mon 09-Aug

Mon 16-Aug

Wed 18-Aug

 

Thu 19-Aug

Mon 23-Aug

Mon 30-Aug

Wed 01-Sep

 

Thu 02-Sep

Thu 02-Sep

Mon 13-Sep

Wed 15-Sep

Mon 06-Sep

Thu 16-Sep

Tue 21-Sep

Tue 28-Sep

Thu 30-Sep

 

Fri 01-Oct

Mon 04-Oct

Mon 11-Oct

Wed 13-Oct

 

Thu 14-Oct

Tue 19-Oct

Tue 26-Oct

Mon 01-Nov

 

Tue 02-Nov

Mon 08-Nov

Mon 15-Nov

Wed 17-Nov