DC Tie Automation Project

Automation Project Objectives Automate Comparison of eTags to QSE DC Tie Schedules Automate Operator offsets for DC Tie eTag/Schedule mismatches Monitor/compare eTag Net Scheduled Interchange to DC Tie SCADA on EMS Display Automate Inadvertent Energy Accounting

Automate Comparison of eTags to QSE DC Tie Schedules Add a QSE number or drop down tab in eTag form to Identify ERCOT QSE Upload ERCOT DC Tie schedules to OATI Contract with OATI for new displays to sort and compare eTags to QSE DC Tie schedules Download eTag schedule data from OATI to MDB and Settlements Enhanced eTag/QSE Schedule reporting capability

Automate Operator offsets for DC Tie eTag/Schedule mismatches Download approved eTag schedules to ERCOT MDB and MOS Substitute eTag Schedules for QSE DC Tie Schedules in the operating period real time applications Automatically provides correct DC Tie flow to SPD for congestion analysis and balancing Manual operator offset for DC Tie mismatches no longer necessary

Monitor/Compare eTag Net Scheduled Interchange to DC Tie SCADA on EMS Display Sum of eTags for DC Tie equals Net Scheduled Interchange NSI downloaded from OATI and linked to an EMS display next to DC Tie SCADA value Alarm for Differences Errors identified quickly

Automate Inadvertent Energy Accounting Perform Inadvertent Energy Accounting on OATI application Eliminate internal manual spreadsheets Upload EPS meter data for DC Ties for final meter reading corrections Inadvertent Energy information downloaded from OATI for final archives Enhanced OATI reporting capabilities