Shortened RTM Settlement Timeline (NPRR509) Transition Plan - Phase 2 Matt Tozer / Ohlen Genove CSWG July 15, 2013

2 Review of NPRR509 Reduce posting date for RTM Initial Settlement Statement from 9 days after Operating Day to 7 days after Operating Day Reduce posting date for RTM Final Settlement Statement from 59 days after Operating Day to 57 days after Operating Day COPS recommended 2-phased approach Approved by BOD on March 19, 2013

3 Phased Implementation of NPRR509  Phase 1 RTM Initial posting on Operating Day + 8 Started with the first of the month after BOD approval Operating Day April 1, 2013  Phase 2 RTM Initial posting on Operating Day + 7 RTM Final posting on Operating Day + 57 Recommendation to start 4 months after implementation Operating Day August 1, 2013 NOTE: COPS and TAC both recommended moving forward with Phase 2 implementation

4 Phase 2 – RTM Initial Operating Day + 7  Thursday posting includes 2 RTM Initial Statements instead of the usual 1 RTM Initial Statement 8/5/2013 (M) 8/6/2013 (T) 8/7/2013 (W) 8/8/2013 (Th) 8/9/2013 (F) Statements DAM 8/1DAM 8/2 - 8/4DAM 8/5DAM 8/6DAM 8/7 Initial 7/26 – 7/28Initial 7/29Initial 7/30Initial 7/31 – 8/1Initial 8/2 Final 6/5 – 6/7Final 6/8Final 6/9Final 6/10Final 6/11 TrueUp 2/4 – 2/6TrueUp 2/7TrueUp 2/8TrueUp 2/9TrueUp 2/10

5 Phase 2 – RTM Initial Protocol Language RTM Initial Statement ERCOT shall issue an RTM Initial Statement for each Statement Recipient for a given Operating Day on the seventh day after the Operating Day, unless that seventh day is not a Business Day. If the seventh day is not a Business Day, then ERCOT shall issue the RTM Initial Statement on the next Business Day after the seventh day. Withstanding the above, for Operating Days that are observed holidays as defined in paragraphs (e) and (f) within the definition of Business Day in Section 2.1, Definitions, ERCOT shall issue an RTM Initial Statement for each Statement Recipient on the eighth day after the Operating Day, unless that eighth day is not a Business Day. If the eighth day is not a Business Day, then ERCOT shall issue the RTM Initial Statement on the next Business Day after the eighth day.  Starting Operating Day August 1, 2013

6 Protocol Section 2 – Business Day Business Day Monday through Friday, excluding observed holidays listed below: (a)New Year’s Day; (b)Memorial Day; (c)Independence Day; (d)Labor Day; (e)Thanksgiving Thursday and Friday; and (f)Two days at Christmas, as designated from time to time by the ERCOT CEO.

7 Phase 2 – Holiday OD = RTM Initial Operating Day + 8 ERCOT HolidaysOD + 8OD +8 DayPost Date 9/2/20139/10/2013Tuesday9/10/ /28/201312/6/2013Friday12/6/ /29/201312/7/2013Saturday12/9/ /24/20131/1/2014Wednesday1/2/ /25/20131/2/2014Thursday1/2/2014 1/1/20141/9/2014Thursday1/9/2014

8 Phase 2 – Holiday OD = RTM Initial Operating Day + 8  Labor Day 2013 ERCOT HolidaysOD + 8OD +8 DayPost Date 9/2/20139/10/2013Tuesday9/10/2013 9/9/2013 (M) 9/10/2013 (T) 9/11/2013 (W) 9/12/2013 (Th) 9/13/2013 (F) Statements Initial 8/31 – 9/1Initial 9/2 - 9/3Initial 9/4Initial 9/5Initial 9/6

9 Phase 2 – Holiday OD = RTM Initial Operating Day + 8  Thanksgiving 2013 ERCOT HolidaysOD + 8OD +8 DayPost Date 11/28/201312/6/2013Friday12/6/ /29/201312/7/2013Saturday12/9/ /2/2013 (M) 12/3/2013 (T) 12/4/2013 (W) 12/5/2013 (Th) 12/6/2013 (F) Statements Initial 11/21 – 11/25Initial 11/26Initial 11/27Initial 11/28 12/9/2013 (M) 12/10/2013 (T) 12/11/2013 (W) 12/12/2013 (Th) 12/13/2013 (F) Statements Initial 11/29 – 12/2Initial 12/3Initial 12/4Initial 12/5Initial 12/6  Note: No RTM Initial statements issued on 12/5

10 Phase 2 – Holiday OD = RTM Initial Operating Day + 8  Christmas 2013 ERCOT HolidaysOD + 8OD +8 DayPost Date 12/24/20131/1/2014Wednesday1/2/ /25/20131/2/2014Thursday1/2/ /30/2013 (M) 12/31/2013 (T) 1/1/2014 (W) 1/2/2014 (Th) 1/3/2014 (F) Statements Initial 12/21 – 12/23HolidayInitial 12/24 – 12/26Initial 12/27  Note: No RTM Initial statements issued on 12/31

11 Phase 2 – RTM Final: from OD+59 to OD+57 February 10, 2009 OD + 59 OD + 57 Operating DayRTM Final Posting 7/24/2013 9/23/2013 Mon 7/25/2013 9/23/2013 Mon 7/26/2013 9/23/2013 Mon 7/27/2013 9/24/2013 Tue 7/28/2013 9/25/2013 Wed 7/29/2013 9/26/2013 Thu 7/30/2013 9/27/2013 Fri 7/31/2013 9/30/2013 Mon 8/1/2013 9/30/2013 Mon9/27/2013Fri 8/2/2013 9/30/2013 Mon9/30/2013Mon 8/3/ /1/2013 Tue9/30/2013Mon 8/4/ /2/2013 Wed9/30/2013Mon 8/5/ /3/2013 Thu10/1/2013Tue 8/6/ /4/2013 Fri10/2/2013Wed 8/7/ /7/2013 Mon10/3/2013Thu 8/8/ /7/2013 Mon10/4/2013Fri 8/9/ /7/2013 Mon10/7/2013Mon 8/10/ /8/2013 Tue10/7/2013Mon

12 Phase 2 – RTM Final Operating Day /26/2013 (Th) 9/27/2013 (F) 9/30/2013 (M) 10/1/2013 (T) Statements DAM 9/24DAM 9/25DAM 9/26DAM 9/27 – 9/29 Initial 9/19Initial 9/20Initial 9/21 – 9/23Initial 9/24 Final 7/29Final 7/30, 8/1Final 7/31, 8/2 – 8/4Final 8/5 TrueUp 3/30TrueUp 3/31TrueUp 4/1 – 4/3TrueUp 4/4  Friday posting includes 2 RTM Final statements instead of the usual 1 RTM Final statement  Due to new schedule, 8/1 RTM Final posts earlier than 7/31 RTM Final  Monday posting includes 4 RTM Final statements instead of the usual 3 on Mondays

13 Key Dates on Transition – Phase 2  RTM Initial for Operating Day 8/1/2013 posts on 8/8/2013  RTM Final for Operating Day 8/1/2013 posts on 9/27/2013  Note: No RTM Initial Statement posted on 12/5/2013 and 12/31/2013  Settlement Calendar to be updated by end of July 2013