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Energy Emergency Alert (EEA) Events Summary August 2 ― August 5, 2011

Energy Emergency Alert (EEA) Events Summary August 2 ― August 5, 2011. August 11, 2011 ERCOT Public. EEA Event Summary August 2-5, 2011.

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Energy Emergency Alert (EEA) Events Summary August 2 ― August 5, 2011

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  1. Energy Emergency Alert (EEA) Events Summary August 2 ― August 5, 2011 August 11, 2011 ERCOT Public

  2. EEA Event Summary August 2-5, 2011 • Note:*ERCOT breaks peak demand record. The number is not final until completion of the market’s financial settlement process six months after the operating day.  August 11, 2011 ERCOT Public

  3. Energy Emergency Alert Events: August 02 ― August 05, 2011 1:45pm Issued EEA 1 2:26pm Issued EEA 2A 3:42pm Issued EEA 2B Cancelled EEA 1 Cancelled EEA 1 Cancelled EEA 1 5:30pm Move to EEA 2A 6:07pm Move to EEA 1 6:52pm Cancelled EEA 1 August 2 August 3 August 4 August 5 2:40pm 6:00pm 2:50pm 6:10pm 1:45pm 6:52pm 3:10pm 6:05pm Duration 3h 20min Non-Spin 1,657 MW Peak Load 67,929* MW HE17 MAPE for MTLF 3.09% Frequency Max/Min 60.049/59.965 Hz Wind Max/Min 1,697/1,441 MW Import DC Ties 840 MW Outaged Capacity Max 3,624.63 MW Duration 3h 20min Non-Spin 1,392 MW Peak Load 68,294* MW HE17 MAPE for MTLF 2.12% Frequency Max/Min 60.04/59.928 Hz Wind Max/Min 2,233/1,690 MW Import DC Ties 763 MW Outaged Capacity Max 3,922.63 MW Duration 5h 7min Non-Spin 1,392 MW Peak Load 66,849 MW HE16 MAPE for MTLF 0.99% Frequency Max/Min 60.078/59.95 Hz Wind Max/Min 1,576/939 MW Import DC Ties 1,039MW Outaged Capacity Max 5,229.63 MW Duration 2h 55min Non-Spin 1,657 MW Peak Load 66,661MW HE17 MAPE for MTLF 0.94% Frequency Max/Min 60.028/59.963 Hz Wind Max/Min 1,647/1,417 MW Import DC Ties 998 MW Outaged Capacity Max 4,289.63MW Issued EEA 1 Reserves below 2,300 MW Issued EEA 1 Reserves below 2,300 MW Issued EEA 1 Reserves below 2,300 MW Note:*ERCOT breaks peak demand record ERCOT Public

  4. ERCOT System Summary ERCOT Public

  5. ERCOT Load, Online Capacity, Offline Non-Spin and Net DC flow Peak Demand Record 67,929* MW HE17 Peak Demand Record 68,294* MW HE17 Note:*ERCOT breaks peak demand record ERCOT Public

  6. ERCOT NEW Peak Demand Record Instantaneous Peak: August 3, 2011 at 4:24 pm. ERCOT Public

  7. DC Ties “importing power” during the EEA events • Maximum Generation from other grids across Direct Current Ties during EEA events: • Aug 2= 840 MW • Aug 3= 763 MW • Aug 4= 1,039 MW • Aug 5= 998 MW 763 MW 840 MW 998 MW 1,039 MW ERCOT Public

  8. ERCOT Outage Capacity (HSL) Summary 5229.63 MW 4289.63 MW 3922.63 MW 3624.63 MW ERCOT Public

  9. The role of the Wind Generation

  10. Day-Ahead Load Forecast Note:*ERCOT breaks peak demand record August 11, 2011 ERCOT Public

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