Res 2014-050/Transmission Planning Data Services Agreement with ERCOT and LCRA

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Lr6ki;.� ENERGY • WATER • COMMUNITY SERVICES Under - Frequency Load Shedding (UFLS) Procedure (planning) To accommodate load data uncertainty, load fluctuation and / or unplanned load transfers, LCRA TSC will target an overall UFLS program total of 26.5 percent (5.5 percent for step 1, 10.5 percent for step 2, and a 10.5 percent for 3). In addition, LCRA TSC will conduct an internal UFLS survey during November each year to monitor and make necessary adjustments to the UFLS program where deficient. Customers may request changes to their UFLS load over 26.5 percent only between the ERCOT April UFLS survey and the November internal UFLS survey from LCRA TSC. Upon approval, these changes should be implemented before the November internal UFLS survey. LCRA direct connect customers must meet their obligation on ERCOT requirements for under - frequency load shedding (UFLS). The ERCOT Operating Guides state — "At least 25 percent of the ERCOT system load that is not equipped with high -set under - frequency relays shall be equipped at all times with provisions for automatic under - frequency load shedding." To ensure fairness and equity and to maximize efficiency and cost - effectiveness in meeting this ERCOT UFLS requirement, the procedure detailed below will be used annually by LCRA and the direct connect customers. LCRA TSC will provide to ERCOT during the Annual April UFLS survey for participating customers the data as requested using the ERCOT supplied data forms. UFLS participation shall be reviewed annually by LCRA. One time after the completion of the current year ERCOT UFLS survey, and then after the LCRA program survey. LCRA will distribute the upcoming year UFLS participation requirements to each of the direct connect customers. Level 1 Participation Based on the total LCRA direct connect customer load at the current year UFLS survey date and time: 1) If the total direct connect customer's system load is equal to or less than 5,000 kW on the UFLS survey dates OR the direct connect customer supplies its entire load with three distribution feeders or less, that direct connect customer is exempt from UFLS participation for the upcoming year. The 25 percent ERCOT requirement will be met by the other LCRA direct connect customers as stated in 2) and 3) below. 2) If the total direct connect customer's system load is greater than 5,000 kW on the UFLS survey dates AND the direct connect customer supplies its entire load with four distribution feeders, that direct connect customer will be required to meet all of its 25 percent UFLS participation at step 2 (58.9 Hz) or step 3 (58.5 Hz). 3) If the total direct connect customer's system load is greater than 5,000 kW on the UFLS survey dates AND the direct connect customer supplies its load with five or more distribution feeders, that direct connect customer is required to contribute 25 percent of its load to the UFLS program for the upcoming year with 5 percent at step 1 (59.3 Hz), 10 percent at step 2 (58.9 Hz), and 10 percent at step 3 (58.5 Hz). Revision 1 — Describe LCRA TSC UFLS Program Targets, Internal Survey, and Review Process — July 2008 Revision 2 — Add LCRA TSC responsibilities to address NERC standards; add revision / change period — March 2010, Revision 3 — add analysis statement April 2010, Revision 4 — add corrective actions, and ERCOT supplied data statements — April 2010, Revision 5 - Add clarification, background information, references to ERCOT and NERC, and requirements to insure UFLS coverage during scheduled outages September 2011, Revision 6 — Add review process item #7 February 2013