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.
As of December 2018, all Generator Interconnection Status Reports will be posted at the link above.
Resource Capacity Trend Charts
Charts and accompanying data showing annual and monthly 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 are updated on a monthly basis, and include natural gas, wind, solar, and battery storage resource types.
***NEW*** This new report series shows monthly installed and planned wind, solar and battery storage capacity for an 18-month period (current reporting month plus the following 17 months).
This revised file reflects capacity changes for several installed solar and wind plants that were not updated during 2019 based on new Resource Asset Registration Forms (RARFs). Additionally, chart footnotes were added to clarify that newly installed capacity includes only those projects for which ERCOT has approved commercial operations. In contrast, ERCOT operational reports include additional project capacity that has been approved for grid synchronization but not commercial operations.
Seasonal Assessment of Resource Adequacy (SARA)Seasonal Assessment of Resource Adequacy (SARA)
The SARA report serves as an early indicator of the risk that ERCOT may need to call an Energy Emergency Alert Level 1 (EEA1) due to having insufficient operating reserves during seasonal peak electric demand periods. It uses a scenario approach to illustrate a range of resource adequacy outcomes based on extreme system conditions. The SARA report relies on projected resource capabilities and peak demand forecasts similar to the CDR report. However, unlike the CDR, it incorporates generator outage trends to determine the expected amount of resource capacity available for operating reserves.
Capacity, Demand and Reserves (CDR) ReportCapacity, Demand and Reserves (CDR) Report
This biannual report contains a multi-year forecast of summer/winter peak electricity demand and expected generation resources, along with the calculation of Planning Reserve Margins (PRMs). The PRM represents the excess resource capacity available to cover uncertainties in future peak electricity demand, generator availability and new resource supply. The PRM is expressed as a percentage of firm peak demand (i.e., demand that is not subject to interruption in exchange for incentive payments).
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.
This draft report describes the results and modeling approach for estimating the Market Equilibrium and Economically Optimal reserve margins (MERM and EORM, respectively) for study year 2024. ERCOT stakeholder comments on the draft report are due December 30, 2020.
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.
Zip file contains hourly profiles for operational/hypothetical utility-scale solar sites, hourly profiles for metropolitan/rural rooftop PV solar sites, profile development report, and solar site ID files.
This file reflects updated summer seasonal peak average capacity contributions based on the new methodology in Nodal Protocol Revision Request 9NPRR) 890.
