1. Nov 7, 2007 TPTF UI Subgroup Market Participant Roles Gary Macomber

2. 2 TPTF UI SubgroupNov 7, 2007 Proposed Roles and Application Matrix OperatorMarketer or Trader AnalystSettlementsCounter- Party MMS CRR OS MIS MPIM

3. 3 TPTF UI SubgroupNov 7, 2007 Role NameAccess LevelDescription OperatorR/W Controls generation or transmission equipment, oversees the implementation of instructions from ERCOT control operators and systems Marketer or Trader R/W Participates in one or more of the ERCOT managed markets, enters bids, offers, trades into the market management system AnalystR Reviews the results of market and or real time activities for a the Market Participant, develops internal reports and analyses SettlementsR (W for Disputes) Reviews the results of market and or real time activities for a the Market Participant, also, enters disputes Counter-PartyR/W Legal Entity that has established Credit with ERCOT for the purposes of participating in various Energy related markets