***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: May 22, 2014 NOTICE TYPE: W-A052214-01 Operations SHORT DESCRIPTION: Corrections to the assignments of Loads to NOIE and Competitive Load Zones in the Network Operations Model INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: Various Operating Days since Nodal Go-Live through June 10, 2014 LONG DESCRIPTION: The tables below list corrections to the assignments of Loads to Non-Opt-In Entity (NOIE) and Competitive Load Zones and net MW changes to Load Zone totals based on the current hot weather load distribution factors. These corrections will have an effective date of June 11, 2014 to coincide with an update to the Network Operations Model. Individual Load to Load Zone Assignment Station Load Original Load Zone Corrected Load Zone BRAUNIG AUX_T12 LZ_SOUTH LZ_CPS BRAUNIG AUX_T34 LZ_SOUTH LZ_CPS BULLHO BW_123 LZ_SOUTH LZ_AEN BULLHO BW_456 LZ_SOUTH LZ_AEN CALAVERS AUX_JKS LZ_SOUTH LZ_CPS CALAVERS AUX_T12 LZ_SOUTH LZ_CPS CALAVERS AUX_T34 LZ_SOUTH LZ_CPS CARSON CC_789 LZ_SOUTH LZ_AEN CATERP CATERPT2 LZ_SOUTH LZ_LCRA COPEN_RC COPEN_RC LZ_NORTH LZ_RAYBN DECKER ST-1 LZ_SOUTH LZ_AEN DECKER ST-2 LZ_SOUTH LZ_AEN FLATON FLATONT4 LZ_LCRA LZ_SOUTH FRNYW_RC FRNYW_RC LZ_NORTH LZ_RAYBN I20_RC I20RC1 LZ_NORTH LZ_RAYBN I20_RC I20RC2 LZ_NORTH LZ_RAYBN LOSTCR LOSTCRT3 LZ_SOUTH LZ_LCRA LOSTCR LOSTCRT4 LZ_SOUTH LZ_LCRA MEDILA T2 LZ_SOUTH LZ_LCRA MNTLB_RC MNTLB_RC1 LZ_NORTH LZ_RAYBN MNTLB_RC MNTLB_RC2 LZ_NORTH LZ_RAYBN NORDHE 69_12_1 LZ_LCRA LZ_SOUTH Q1 LXFMR4 LZ_SOUTH LZ_CPS SHMW_RC SHMW1 LZ_NORTH LZ_RAYBN SUTHRLND LD1 LZ_SOUTH LZ_CPS TAWK_RC TAWK_RC_1 LZ_NORTH LZ_RAYBN TAWK_RC TAWK_RC_2 LZ_NORTH LZ_RAYBN TRADPOST TP_789 LZ_SOUTH LZ_AEN WOLFLA WOLFLAT4 LZ_SOUTH LZ_LCRA YORKTO MOBILE11 LZ_LCRA LZ_SOUTH Net Impact by Load Zone Based on Current Hot Weather Load Distribution Factors Load Zone Original MWs of Load MWs of Load Moving Updated MWs of Load % Change in MWs of Load LZ_AEN 2262.5 1.6 2264.1 0.1% LZ_CPS 3948.8 65.6 4014.4 1.7% LZ_HOUSTON 12730.1 0.0 12730.1 0.0% LZ_LCRA 1993.8 13.0 2006.8 0.7% LZ_NORTH 22256.2 -27.6 22228.6 -0.1% LZ_RAYBN 466.5 27.6 494.1 5.9% LZ_SOUTH 6669.9 -80.2 6589.7 -1.2% LZ_WEST 3792.0 0.0 3792.0 0.0% Some Loads have had incorrect Load Zone assignments since Nodal Go-Live (12/01/10) that resulted from the initial modeling during the transition from Zonal Congestion Management Zones to Nodal Competitive Load Zones. Other Loads were subsequently introduced with incorrect Load Zone assignments. The total of the Load quantities that were assigned incorrectly to a Load Zone is 109.5 MW for the analysis shown in the table above but will vary by the hour and season. The incorrect Load to Load Zone assignments impacted the results of the price calculations for the Day-Ahead Market (DAM) and Real-Time Market (RTM) and flow calculations for the Congestion Revenue Right (CRR) Auctions and the DAM for some intervals since Nodal Go-Live. However, ERCOT will not perform any price corrections because the error does not meet the criteria described in Protocol Sections 4.5.3(4) and 6.3(4). Lastly, the incorrect assignments of Loads to NOIE and Competitive Load Zones did not have an impact on the MWh quantities allocated to NOIE Load Zones for energy Settlements. ERCOT will ask that this matter be placed on the May 29, 2014 Technical Advisory Committee (TAC) agenda to discuss in further detail and answer any questions. 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 email at [log in to unmask]<mailto:[log in to unmask]>. If you are receiving email 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. mm