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Resource Adequacy 2018

Drought Risk

ERCOT developed a drought risk monitoring tool to screen for potential drought-related impacts to generation resources. The tool predicts whether water supplies used by generation resources in the ERCOT region are at risk of reaching levels requiring closer monitoring over the next 6 to 18 months, based on the most recent reservoir and lake levels from the Texas Water Development Board (TWDB) and historical trends in water usage. The documents available in this section include summaries of the results of this analysis, documentation of the tool methodology, and other related reports.

Sep 11, 2018 - pdf - 317.5 KB
Apr 26, 2018 - pdf - 256.7 KB
Apr 26, 2016 - xlsx - 230 KB

Generator Interconnection Status Report

View the latest public interconnection information on generation resources in the ERCOT region.

GIS REPORT November 2018
Generator interconnection activity for November
Jun 29, 2020 - xlsx - 415.4 KB
GIS REPORT October 2018
Generator interconnection activity for October
Jun 29, 2020 - xlsx - 113.7 KB
GIS REPORT September 2018
Generator interconnection activity for September
Jun 29, 2020 - xlsx - 110.1 KB
GIS REPORT August 2018
Generator interconnection activity for August, using the new report format.
Jun 29, 2020 - xlsx - 113.8 KB
GIS REPORT July 2018
Generator interconnection activity for July
Aug 1, 2018 - xlsx - 1.3 MB
GIS REPORT June 2018
Generator interconnection activity for June
Jul 3, 2018 - xlsx - 1.3 MB
GIS REPORT May 2018 Update
Resource with project name "FEGC" reported as approved for synchronization
Jun 6, 2018 - xlsx - 1.4 MB
GIS REPORT May 2018
Generator interconnection activity for May. ***New Quarterly Stability Assessment (QSA) tab added***
Jun 1, 2018 - xlsx - 1.4 MB
GIS REPORT April 2018
Generator interconnection activity for April
May 2, 2018 - xlsx - 1.4 MB
GIS REPORT March 2018
Generator interconnection activity for March
Apr 2, 2018 - xlsx - 1.4 MB
GIS REPORT February 2018
Generator interconnection activity for February
Mar 1, 2018 - xlsx - 1.4 MB
GIS REPORT January 2018
Generator interconnection activity for January 2018
Feb 2, 2018 - xlsx - 1.4 MB
GIS REPORT December 2017
Generator interconnection activity for December 2017
Jan 3, 2018 - xlsx - 1.4 MB

Resource Capacity Trend Charts

Files with charts and accompanying data showing annual changes in resource capacity by fuel type for the ERCOT Region, incorporating both historical additions and planned projects being studied as part of the interconnection request process. The chart files are updated on a monthly basis.

Capacity Changes by Fuel Type Charts, November 2018
Bar charts and accompanying data showing historical and planned capacity additions for gas, wind, solar, and battery storage resource types.
Dec 4, 2018 - xlsx - 72.4 KB
Capacity Changes by Fuel Type Charts, October 2018
Bar charts and accompanying data showing historical and planned capacity additions for gas, wind, solar, and battery storage resource types.
Nov 1, 2018 - xlsx - 72.2 KB
Capacity Changes by Fuel Type Charts, September 2018
***New Battery Energy Storage chart***
Oct 2, 2018 - xlsx - 68.9 KB
Capacity Changes by Fuel Type Charts, August 2018
Bar charts and accompanying data showing historical and planned capacity additions for gas, wind and solar resource types.
Sep 7, 2018 - xlsx - 59.9 KB

Resource Adequacy Assessments

The SARA is based on criteria similar to CDR, however the seasonal outlook reflects near-term weather forecasts, generator outage trends, and updates to the generation fleet. 

Nov 1, 2018 - xlsx - 127.9 KB
Nov 1, 2018 - pdf - 270.2 KB
Nov 1, 2018 - xlsx - 127.2 KB
Nov 1, 2018 - pdf - 268.6 KB
Sep 6, 2018 - xlsx - 127.4 KB
Sep 6, 2018 - pdf - 260.6 KB
Apr 30, 2018 - xlsx - 114.3 KB
Apr 30, 2018 - pdf - 225.6 KB
Apr 30, 2018 - xlsx - 116.5 KB
Apr 30, 2018 - pdf - 260.1 KB
Mar 1, 2018 - xlsx - 116.3 KB
Mar 1, 2018 - pdf - 252.8 KB
Mar 1, 2018 - xlsx - 129.9 KB
Mar 1, 2018 - pdf - 252.4 KB
Nov 1, 2017 - xlsx - 126.4 KB
Nov 1, 2017 - pdf - 259.4 KB
Nov 1, 2017 - xlsx - 125.4 KB
Nov 1, 2017 - pdf - 259.4 KB

This biannual report contains a 10-year forecast of electric use and expected generation resources.

Planning Reserve Margin Analysis

This section consists of documents and data files pertaining to the Economically Optimum Reserve Margin (EORM) reporting initiative, which was authorized by the Public Utility Commission of Texas as part of Project Number 42302, "Review of the Reliability Standard in the ERCOT Region." The current minimum target reserve margin established by the ERCOT Board of Directors is 13.75 percent of peak electricity demand to serve electric needs in the case of unexpectedly high demand or levels of generation plant outages.

Dec 20, 2018 - pdf - 7.8 MB
Dec 20, 2018 - pdf - 7.8 MB
Estimation of the Market Equilibrium and Economically Optimal Reserve Margins for the ERCOT Region
Study prepared by The Brattle Group on new target reserve margin methodologies
Oct 12, 2018 - pdf - 7.8 MB
ERCOT Study Process and Methodology Manual for EORM/MERM 12-12-2017 v1.0
Final document version with responses to stakeholder comments incorporated
Dec 12, 2017 - docx - 756.2 KB
ERCOT Study Process and Methodology Manual for EORM MERM 11 3 2017 InitialDraft
Initial public draft for 30-day public review and comment period
Nov 3, 2017 - docx - 753.9 KB
Cost of New Entry Estimates for Combustion Turbine and Combined Cycle Plants in PJM
Report prepared for PJM Interconnection, Inc., by the Brattle Group and Sargent & Lundy.
May 22, 2017 - pdf - 2.2 MB
ERCOT EORM/MERM Stakeholder Comments Log, 5-22-2017
Stakeholder comments and ERCOT responses on the EORM/MERM study project.
May 22, 2017 - pdf - 89.2 KB
ERCOT EORM_Workshop 4-14-2017 Revised
EORM Workshop PowerPoint presentation. Reflects a revision to slide #31.
May 16, 2017 - pptx - 7.9 MB
ERCOT Primer on the NERC Reference Margin Level 5-15-2017
Background information on NERC's Reference Margin Level and how it is used for resource adequacy reporting in NERC reliability assessment reports.
May 16, 2017 - pdf - 196.9 KB
Estimating the Economically Optimal Reserve Margin in ERCOT Revised
Report prepared by The Brattle Group and Astrape Consulting for the Public Utilities Commission of Texas, filed January 31, 2014. This version comes from the Brattle Group’s Web site, and reflects post-filing corrections to page 63.
May 16, 2017 - pdf - 3.2 MB

Wind and Solar

Wind and solar profiles for use in ERCOT planning studies, as well as files showing the derivation of wind and solar peak average capacity percentages using approved CDR methodologies.

CDR Solar 2018 Summer Peak Average Capacity Percentages, 10-21-2018
Summer season solar capacity contributions, updated to reflect 2018 summer historical data
Dec 22, 2018 - xlsx - 26.2 KB
CDR Wind 2018 Summer Peak Average Capacity Percentages, 10-21-2018
Summer season wind capacity contributions, updated to reflect 2018 summer historical data
Dec 22, 2018 - xlsx - 32.2 KB
ERCOT Wind Patterns for Existing Sites, 1980-2017
Zip file containing the wind patterns, the final wind pattern development report, and a site ID key.
Sep 7, 2018 - zip - 76.1 MB
CDR Winter PeakAveWindCapacityPercentages 4 9 2018
Winter season wind capacity contributions, updated to reflect 2017-2018 winter historical data
May 14, 2018 - xlsx - 26.2 KB
CDR Winter PeakAveSolarCapacityPercentages 4 9 2018
Winter season solar capacity contributions, updated to reflect 2017-2018 winter historical data
May 14, 2018 - xlsx - 23.9 KB
Feb 9, 2017 - pdf - 1.6 MB
Feb 17, 2017 - pdf - 506.9 KB
Feb 17, 2017 - pdf - 276.6 KB