1. Texas Nodal Transition ACCOUNTABLE EXECUTIVE DESIGNATION Electric Reliability Council of Texas March 30, 2007

2. 2 2 February 28, 2007 ACCOUNTABLE EXECUTIVE DESIGNATION QSE AE Designation AE Designations with Qualified Scheduling Entities (Primary QSEs only).  With Resources ………………… – 30 32 of 32  With Load only …..……………… – 24 35 of 42  Bilateral Trades only……………. – 26 27 of 32

3. 3 3 February 28, 2007 ACCOUNTABLE EXECUTIVE DESIGNATION QSE AE Designation  With Load only …..……………… – 24 35 of 42 Entities Remaining: CLEARVIEW ELECTRIC INC (QSE) ECONNERGY ENERGY COMPANY INC (QSE) JUST ENERGY TEXAS LP (QSE) LIBERTY POWER CORP LLC (QSE) REPOWER LLC (QSE) TEXPO POWER LP DBA TEXPO ENERGY VEGA RESOURCES LLC DBA AMIGO ENERGY (QSE)

4. 4 4 February 28, 2007 ACCOUNTABLE EXECUTIVE DESIGNATION QSE AE Designation  Bilateral Trades only……………. – 26 27 of 32 Entities Remaining: CITADEL ENERGY PRODUCTS LLC DPI ENERGY LLC DUKE ENERGY OHIO INC NORTHERN STATES POWER COMPANY TRANSALTA ENERGY MARKETING (US) INC

5. 5 5 February 28, 2007 ACCOUNTABLE EXECUTIVE DESIGNATION QSE AE Designation by Sector AE Designations with Qualified Scheduling Entities (Sub-QSEs not included). *Sector assignment figures are estimates.  Investor Owned Utilities – 3 of 3  Cooperatives – 3 of 3  Municipal – 4 of 4  Independent Generator – 19 20 of 20  Independent Power Marketer – 26 27 of 32  Independent REP – 24 35 of 42  Industrial Consumers – 1 2 of 2

6. 6 6 February 28, 2007 ACCOUNTABLE EXECUTIVE DESIGNATION TSP AE Designation Number of AE Designations for Transmission Service Providers. *Sector assignment figures are estimates.  Investor Owned Utilities – 4 of 4  Cooperatives – 4 5 of 5  Municipal – 9 of 9

7. 7 7 February 28, 2007 For more information... To designate your Accountable Executive, please contact your ERCOT Account Manager Texas Nodal Website: http://nodal.ercot.comhttp://nodal.ercot.com Subscription-based newsletter published every other Friday: http://lists.ercot.com/cgi-bin/majordomo. Select TexasNodalNews http://lists.ercot.com/cgi-bin/majordomo E-mail questions, comments or feedback to: TexasNodal@ercot.com