Periodic drought risk reports based on ERCOT's risk monitoring tool that screens 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. See "Related Documents" under the 2019 Resource Adequacy webpage for documentation of the tool methodology and other related reports.
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 charts are updated on a monthly basis, and include natural gas, wind, solar, and battery storage resource types.
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 and Market Equilibrium Reserve Margin (EORM/MERM) 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.
Final document version with responses to stakeholder comments incorporated
Dec 12, 2017 - docx - 756.2 KB
Wind and Solar
Wind and solar profiles for use in ERCOT planning studies, as well as files showing the derivation of summer/winter wind and solar peak average capacity percentages using approved CDR methodologies.
ERCOT Solar PV Profiles, 1980-2020ERCOT Solar PV Profiles, 1980-2020
These files contains hourly profiles for operational, planned and hypothetical utility-scale solar sites, hourly profiles for metropolitan/rural rooftop PV solar sites, profile development report, and solar site ID files.
