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Seasonal Adjustment Factor Mark Ruane TAC ERCOT Public June 26, 2014

Explore the significance of Seasonal Adjustment Factor in ERCOT's market exposure and credit calculations. Learn how changes in SAF impact total potential exposure. Find out about ERCOT's recommendations for adjusting SAF values. Stay informed on ERCOT's SAF updates.

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Seasonal Adjustment Factor Mark Ruane TAC ERCOT Public June 26, 2014

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  1. Seasonal Adjustment Factor Mark Ruane TAC ERCOT Public June 26, 2014

  2. Seasonal Adjustment Factor High price intervals can significantly increase ERCOT market exposure. ERCOT has performed stress testing to approximate the relative impact of higher cap prices on RT credit exposure. ERCOT Public

  3. Seasonal Adjustment Factor The Seasonal Adjustment Factor (SAF) is a component of the Minimum Current Exposure (MCE) calculation that serves as a price multiplier 16.11.4.1 Determination of Total Potential Exposure for a Counter-Party • MCE = Max[{ [[[Lo, i, d, k * T2- G o, i, d, k * (1-NUCADJ o) * T3] * RTSPP i, d, k*SAF] + [RTQQNETES o, i, d, k* T1]]/n}, • {[G o, i, d, k * NUCADJ o * T1 * RTSPPidk*SAF]/n}, • { DARTNETo, i, d, k * T4/n}] • RTQQNETES o, i, d, k= Max [0, [[RTQQES o, i, d, k, c * RTSPP i, d, k*SAF] - [RTQQEP o, i, d, k, c* RTSPP i, d, k*SAF]]] Note that the SAF is not applied to the Estimated Aggregated Liability component of the credit calculation, which is typically larger than MCE. ERCOT Public

  4. Seasonal Adjustment Factor The Seasonal Adjustment Factor (SAF is a component of the Minimum Current Exposure (MCE) calculation that serves as a price multiplier. 16.11.4.1 Determination of Total Potential Exposure for a Counter-Party • SAF = Seasonal Adjustment Factor—Used to provide for the potential for Seasonal price increases based on historical trends. ERCOT shall initially set this factor equal to 100%. This factor will not go below 100%. ERCOT will provide Notice to Market Participants of any change at least 14 days prior to effective date along with the analysis supporting the change. ERCOT Public

  5. Seasonal Adjustment Factor The current Seasonal Adjustment Factor variable replaced the former SAF with the implementation of NPRR 347/400. The former SAF was a fixed value for each month based on the ratio of prices during historic months with average annual prices. The current SAF has remained at 100% since implementation of NPRR 347/400. The impact of SAF at different values is shown on the following slides using data from August 2013, March 2014, April 2014 and May 2014 . ERCOT Public

  6. Seasonal Adjustment Factor Impact of changing SAF (based on August 31, 2013 market data) * Total collateral and unsecured credit, less amounts locked for CRR auction ERCOT Public

  7. Seasonal Adjustment Factor Impact of changing SAF (based on March 31, 2014 market data) * Total collateral and unsecured credit, less amounts locked for CRR auction ERCOT Public

  8. Seasonal Adjustment Factor Impact of changing SAF (based on April 30, 2014 market data) Approx. March 2014 impact * Total collateral and unsecured credit, less amounts locked for CRR auction ERCOT Public

  9. Seasonal Adjustment Factor Impact of changing SAF (based on May 31, 2014 market data) * Total collateral and unsecured credit, less amounts locked for CRR auction ERCOT Public

  10. Seasonal Adjustment Factor Impact of changing SAF ERCOT Public

  11. Seasonal Adjustment Factor Impact of changing SAF ERCOT Public

  12. Seasonal Adjustment Factor ERCOT staff recommends increasing the Seasonal Adjustment Factor to a value of 400% from the effective date through the end of July, 500% for the month of August, and 400% for the month of September. This will approximate the impact of the high price events in March 2014. ERCOT Public

  13. Seasonal Adjustment Factor Questions ERCOT Public

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