Last Edited on 7/30/2018 Proposed NPRR 863 Ancillary

Last Edited on 7/30/2018 Proposed NPRR 863 Ancillary

Last Edited on 7/30/2018 Proposed NPRR 863 Ancillary Service Framework Changes NPRR 863 WITH STEC COMMENTS (4/26, 8/2) CURRENT FRAMEWORK REGULATION REGULATION 157 to 687 MW* 157 to 687 MW* RESPONSIVE RESERVE SERVICE 1. Primary Frequency Response 2. Load Resources on Under Frequency Relay (UFR) 3. 10 minute ramp 2,300 to 3,200 MW* No Change FREQUENCY RESPONSE SERVICE (FRS) FFR Triggered at 59.85 Hz and full response in 15 cycles Once deployed, sustain for up to 15 mins. Once recalled, restore within 15 mins Fast Frequency Response (FFR) PFR PFR capable capacity reserved on generators or Controllable Load Resources (CLR) Minimum 1,150 MW must be provided by resources capable of PFR Load Resources on UFR Primary Frequency Response (PFR) 2,300 to 3,200 MW* ERCOT CONTINGENCY RESERVE SERVICE (ECRS) 10 minute ramp Load Resources may or may not be on UFR Load Resources on UFR Triggered at 59.70 Hz and full response in 30 cycles Sustain until recalled. Once recalled, restore within 3 hours Beyond the minimum PFR, up to 60% of total FRS can come from Load Resources on UFR or FFR. Generation Online or offline capacity that can be converted to energy within 10 minutes Dispatched by SCED Load Resources (UFR not required) Up to 50% of ECRS capacity can come from Load Resources with or without UFR Once deployed, must respond within 10 minutes. Restoration within 3 hours 508 to 1,644 MW** NON-SPIN NON-SPIN 967 to 2,361 MW* 0 to 1,180 MW*** Overall A/S: 3,807 to 5,958 MW* PUBLIC No protocol changes. Proposed methodology for Non-Spin Reserve Service quantities in this framework quantities computed using 2018 A/S Methodology are reduced by ECRS quantities. Overall A/S: 3,807 to 5,958 MW* *Quantities computed/estimated using 2018 Ancillary Service Methodology. **Quantities estimated using this reference. ***Quantities estimated using this reference and method in box on far left. For Discussion Purposes Only. The intent of this slide is to represent NPRR 863 (with ERCOT comments from 7/6/2018). Protocol language prevails to the extent of any inconsistency with this one page summary. 1 1 Last Edited on /16/2018

Proposed NPRR 863 Ancillary Service Framework Changes NPRR 863 WITH STEC COMMENTS (4/26, 8/2) AND ERCOT STEEL SUGGESTIONS CURRENT FRAMEWORK REGULATION REGULATION 157 to 687 MW* 157 to 687 MW* RESPONSIVE RESERVE SERVICE 1. Primary Frequency Response 2. Load Resources on Under Frequency Relay (UFR) 3. 10 minute ramp 2,300 to 3,200 MW* RESPONSIVE RESERVE SERVICE (RRS) FFR Triggered at 59.85 Hz and full response in 15 cycles Once deployed, sustain for up to 15 mins. Once recalled, restore within 15 mins Fast Frequency Response (FFR) PFR PFR capable capacity reserved on generators or Controllable Load Resources (CLR) Minimum 1,150 MW must be provided by resources capable of PFR Load Resources on UFR Primary Frequency Response (PFR) 2,300 to 3,200 MW* ERCOT CONTINGENCY RESERVE SERVICE (ECRS) 10 minute ramp NON-SPIN 967 to 2,361 MW* Load Resources may or may not be on UFR PUBLIC Load Resources on UFR Triggered at 59.70 Hz and full response in 30 cycles Sustain until recalled. Once recalled, restore within 3 hours Beyond the minimum PFR, up to 60% of total FRS can come from Load Resources on UFR or FFR. Generation Online or offline capacity that can be converted to energy within 10 minutes Dispatched by SCED Load Resources (UFR not required) Up to 50% of ECRS capacity can come from Load Resources with or without UFR Once deployed, must respond within 10 minutes. Restoration within 3 hours 508 to 1,644 MW** NON-SPIN 0 to 1,180 MW* Overall A/S: 3,807 to 5,958 MW* No Change No protocol changes. Proposed methodology for Non-Spin Reserve Service quantities in this framework quantities computed using 2018 A/S Methodology are reduced by ECRS quantities. Overall A/S: 3,807 to 5,958 MW* *Quantities computed/estimated using 2018 Ancillary Service Methodology. **Quantities estimated using this reference. For Discussion Purposes Only. The intent of this slide is to represent NPRR 863 (with ERCOT comments from 7/6/2018). Protocol language prevails to the extent of any inconsistency with this one page summary. 2 2

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