NOTICE DATE: December 2, 2009 NOTICE TYPE: W-A120209-01 Operations SHORT DESCRIPTION: ERCOT has determined the Congestion Management (CM) Zone and Shadow Price names for 2010. The ERCOT test environment will be available for market participant year-end testing. INTENDED AUDIENCE: QSE Operations and Settlements Personnel DAYS AFFECTED: December 15 and 17, 2009 - Test Days LONG DESCRIPTION: ERCOT has determined the short names for the 2010 Congestion Management Zones and the recorder names for the 2010 Congestion Shadow Prices. The Short Names are the identifiers that Market Participants will see in their Data Extracts designating the CM Zone in billing determinants. These values are: CM Zone Name Short Name NORTH2010 N10 HOUSTON2010 H10 SOUTH2010 S10 WEST2010 W10 The Shadow Price Recorder names are as follows: Congestion Path Name Recorder Name WEST-NORTH MCPESPC_W10N10 NORTH-WEST MCPESPC_N10W10 SOUTH-NORTH MCPESPC_S10N10 NORTH-SOUTH MCPESPC_N10S10 NORTH-HOUSTON MCPESPC_N10H10 ADDITIONAL INFORMATION: The ERCOT Market Operations Test Environment (MOTE) will be available for two test days on December 15 and 17, 2009 according to the schedules below. MOTE 2010 CM Zone Testing - Test Day #1 December 15 Real-time Simulated time 12/15/09 8:00 12/31/09 17:00 Start test; Day-Ahead and AS Market Open for Trade Day January 1, 2010 12/15/09 11:00 12/31/09 20:00 AS Market Close for Trade Day January 1, 2010 12/15/09 12:00 12/31/09 21:00 Day-Ahead Market Close for Trade Day January 1, 2010. Run RPRS for January 1, 2010 12/15/09 15:00 12/31/09 24:00 New Year Transition to January 1, 2010 12/15/09 18:00 1/01/10 03:00 Close of test MOTE 2009 CM Zone Testing - Test Day #2 December 17 Real-time Simulated time 12/17/09 8:00 12/31/09 17:00 Start test; Day-Ahead and AS Market Open for Trade Day January 1, 2010 12/17/09 11:00 12/31/09 20:00 AS Market Close for Trade Day January 1, 2010 12/17/09 12:00 12/31/09 21:00 Day-Ahead Market Close for Trade Day January 1, 2010. Run RPRS for January 1, 2010 12/17/09 15:00 12/31/09 24:00 New Year Transition to January 1, 2010 12/17/09 18:00 1/01/10 03:00 Close of test ACTION REQUIRED: ERCOT requests participants to assess the impact on their systems and prepare accordingly. ERCOT will be conducting a simulation test of year-end transition in the third week of December 2009. CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via e-mail at [log in to unmask]<mailto:[log in to unmask]>. If you are receiving e-mail from an ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com<http://lists.ercot.com/>. dh