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.