ERCOT Outaged Resource Capacity Market Analysis Report

ERCOT Reporting of Outaged Resource Capacity Market Analysis ERCOT WMWG July 22nd, 2019

Agenda 1. Summary of June 24th WMWG Discussion 2. Key Findings 3. Current ERCOT Nodal Protocol Language 4. Differences Between Reports 5. Moving Forward 2 PUBLIC

Summary of June 24th WMWG Discussion There are 4 different places to either monitor or derive outaged capacity 1. 2. 3. 4. System Ancillary Service Capacity Monitor Hourly Resource Outage Capacity 60-Day SCED Disclosure Report 60-Day COP Disclosure Report 3 PUBLIC

Summary of June 24th WMWG Discussion System Ancillary Service Capacity Monitor reports the system total telemetered HSL of Resources with a telemetered Resource Status of OUT or EMRSWGR Includes seasonally mothballed Resources Some Resources may set HSL telemetry to 0 when OUT Hourly Resource Outage Capacity report shows the sum of the difference between the Seasonal HSL and the outaged HSL, as entered in the Outage Scheduler, of approved and accepted outages Includes Resource derates Some Resources may exit their Outage and come online in RT or delay their Outage 60-Day SCED Disclosure Report will be similar to System Ancillary Service Capacity Monitor with a few exceptions: Excludes Seasonal Mothballed Resources (and other non-market participating resources) HSL of IRRs with a Resource Status of OUT set to 0 60-Day COP Disclosure Report can be used to compare 60-Day SCED Disclosure Report 4 PUBLIC

Key Findings Short-Term System Adequacy Report Includes the Hourly Resource Outage Capacity Report In the Market, Reports are typically used for forecasting day-to-day capacity System Ancillary Service Capacity Monitor provides RT outaged capacity Hourly Resource Outage Capacity provides forward looking (7-days) outaged capacity 5 PUBLIC

Hourly Resource Outage Report Requirement for report was created with NPRR429 to increase market transparency NPR844 separated Resources in the model but are not yet in commercial operation from the rest of the Outage capacity New Equipment Energization Where to find this report: ercot.com Grid Information Generation, or MIS Reports (link) 6 PUBLIC

Hourly Resource Outage Report ERCOT Nodal Protocols 3.2.3 (3) (b) ERCOT shall post a total system-wide capacity of Resource Outages as reflected in the Outage Scheduler that are accepted or approved. The Resource Outage capacity amount shall be based from each Resource s current Seasonal High Sustained Limit (HSL) and posted each hour for the top of each Operating Hour for the next 168 hours. This posted information will exclude specific Resource information and Outages related to Mothballed or Decommissioned Generation Resources, and will be aggregated on a system-wide basis in three categories: (i) IRRs with an Outage Scheduler nature of work other than New Equipment Energization ; (ii) Other Resources with an Outage Scheduler nature of work other than New Equipment Energization ; and (iii) Resources with an Outage Scheduler nature of work New Equipment Energization ; 7 PUBLIC

System Ancillary Service Capacity Monitor Requirement for report was created with NPRR770 to increase market transparency Added Aggregate capacity of Resources telemetering a Resource Status of OUT, OUTL, or EMR Where to find this report: ercot.com Grid Information, or MIS Applications System Ancillary Service Capacity Monitor (link) 8 PUBLIC

System Ancillary Service Capacity Monitor ERCOT Nodal Protocols 6.5.7.5 (1) ERCOT shall calculate the following every ten seconds and provide Real-Time summaries to ERCOT Operators and all Market Participants using ICCP, giving updates of calculations every ten seconds, and posting on the MIS Public Area, giving updates of calculations every five minutes, which show the Real-Time total system amount of: (j) Aggregate telemetered HSL capacity for Resources with a telemetered Resource Status of EMR; (k) Aggregate telemetered HSL capacity for Resources with a telemetered Resource Status of OUT; (l) Aggregate net telemetered consumption for Resources with a telemetered Resource Status of OUTL; and 9 PUBLIC

Differences Between Reports System Ancillary Service Capacity Monitor Hourly Resource Outage Capacity Report Sum of all HSL with RST of OUT or EMRSWGR Includes SCADA telemetry from all modelled Resources Includes seasonally mothballed System total at hour granularity (through 7- days out) Accepted and Approved Resource Outages Includes Resource HSL Derates Excludes Resource HSL Derates Excludes permanently retired or mothballed (not modelled) Excludes permanently retired or mothballed (not modelled) Resources may telemeter an HSL of 0 when OUT or EMRSWGR Resource may have foregone outage in RT RT HSL may be different than HSL entered in Outage Scheduler 10 PUBLIC

Example of Differences Between Reports Capacity that would show up in the Hourly Resource Outage Capacity but not in the System Ancillary Service Capacity Monitor 10,000 9,000 8,891 8,000 Cause of Difference 7,000 Outage Capacity (MW) 2,483 Equipment Derate 6,000 Resources on Outage w/ RT HSL = 0 2,854 5,000 Resources w/ Outage in OS but not RT 291 4,000 Emergency Switchable Generation 3,000 3,352 54 2,000 HSL Error Between OS and RT 27 1,000 0 Capacity that would show up in the System Ancillary Service Capacity Monitor but not in Hourly Resource Outage Capacity Hourly Resource Outage Capacity System Ancillary Service Capacity Monitor 11 PUBLIC

Moving Forward If Stakeholders would like to reconcile differences between two Reports, possible changes include: Behavioral rules System level (changes to reports) 12 PUBLIC

Questions? Thank you!! PUBLIC