After-the-Fact Workgroup Update Sheryl Welch ISAS Meeting January 12-13, 2016 Phoenex, AZ

2 o Webinar was held November 5, o Object was to have specific reasons for ATF Tags. o Following changes were made. Reasons to Create ATF Tags ATF tags are used by Balancing Authorities (BAs or CAs), Transmission Service Providers (TSPs), and Scheduling Entities (SEs) to accurately reflect a schedule which was coordinated and controlled by a BA’s Energy Management System (EMS) and Automatic Generation Control (AGC) system during real time system operations, but was not properly tagged. Missing or incorrectly used CA (Balancing Authority), TP (Transmission Provider), or SE (Scheduling Entity) Missing adjacencies or incorrect Point of Receipt or Point of Delivery segment(s) When there is an Emergency and WIT system goes down. ATF tags shall not be used for market driven manipulations. NOTE: When an ATF tag is needed to correct a dynamic tag, the tag type is normal. ATF Tagging Guidelines

3 Posted for Comments on December 9, Three Comments Received. ATFWG Meeting/Webinar was held yesterday. o Discussed Inadvertent and how it affects ACE. o Discussed whether or not PeakRC was going to accept ATF changes. o Discussed the comments that were received.  APS question—If a unit is off line, but energy was tagged from that unit but generated from its sister unit is that a reason for a WIT change? Consensus was No.  NWMT—Section 1.4 Definitions: WIT – Western Interchange Tool. Should be WECC Interchange Tool (Change made) ATF Tagging Guidelines (Cont’d)

4  BANC/SMUD/TANC—Only bullets one, three, and four are required in the Attachment 1. If there are any instances in which a tag had a missing or incorrect BA, TP, SE, Adjacency or POR/POD which needed to be corrected, then those corrections should only be made under the provision of the bullet one. ATF Tagging Guideline (Cont’d)

5 Reasons to Create ATF Tags ATF tags are used by Balancing Authorities (BAs or CAs), Transmission Service Providers (TSPs), and Scheduling Entities (SEs) to accurately reflect a schedule which was coordinated and controlled by a BA’s Energy Management System (EMS) and Automatic Generation Control (AGC) system during real time system operations, but was not properly tagged. o Missing or incorrectly used CA (Balancing Authority), TP (Transmission Provider), or SE (Scheduling Entity) o Missing adjacencies or incorrect Point of Receipt or Point of Delivery segment(s) When there is an Emergency and WIT system goes down. ATF tags shall not be used for market driven manipulations. NOTE: When an ATF tag is needed to correct a dynamic tag, the tag type is normal. ATF Tagging Guidelines (Cont’d)

6 Decision was to have a one or two-day workshop to focus on all the ATF tag issues, with PEAKRC, WECC, ATFWG. ATF Tagging Guidelines

7 Previous changes to WIT Schedule Change Request Form o Converted to Excel Spreadsheet o Added Date and Lead Party o Changed from WECC to WIT Schedule Change Request Form New Changes to the Form for tracking purposes only o Added two columns  ATF Created (Y/N)  Number of ATF Tags Needed o Added For ATF Chair Use Only Box o Added “….and and cc the ATFWG Note: Until we hear different, form is to be submitted to both WECC & PEAK WIT Schedule Change Request Form

8 WIT SCHEDULE CHANGE REQUEST FORM

ATF WIT Changes REASON Incorrect Path or Sched Entity Scheduling or Adjusting Error System Error Generation/Meter Adjustment Incorrect Source / Sink Curtailment Error03312 Incorrect PSE0085 RSG Tag Error89189 Integration Error1024 Tag Type Correction04900 Incorrect Tag WIT not match OAIT Tag8000 Oversold1000 Unknown0401 TOTAL Current MW Changed to MW Total MW Change

Last update was November 1, If your company has any ATF personnel changes, please send the following information to o Specify: Active ATFWG Member or Distribution Only o Name o Company o Phone o Fax o Updating ATFWG Contact List

QUESTIONS