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WECC would like to thank the individuals who participated in the State of the Interconnection development and review process.


The System Performance Data Portal presents the historical data available at the time of publication. Some sources are not available through the previous year until the fall time frame and will be updated when available. All data is subject to revision without notice in future updates to the report and in other WECC documents. The following is a comprehensive list of sources used in preparing this report:

​The Event Analysis Management System (TEAMS)
Generation Availability Data System (GADS)
Misoperations Information Data Analysis System (MIDAS)
Transmission Availability Data System (TADS)
​North American Electric Reliability Corporation
​Canadian Socioeconomic Database (CANSIM)
​Statistics Canada
Forms FERC-714 and OE-417​
​U.S. Department of Energy
​Electric Power Monthly
Forms EIA-826, EIA-860, EIA-861 and EIA-923
Natural Gas Monthly
​U.S. Energy Information Administration
​Loads and Resources Data Request
​GIS and Map Data
Commission for Environmental Cooperation; National Oceanic and Atmospheric Administration (NOAA); National Centers for Environmental Information (NCEI); National Renewable Energy Laboratory (NREL); National Atlas of the United States (NAUS); United States Geological Survey (USGS); USGS Geospatial Multi-Agency Coordination (GeoMAC); U.S. Census Bureau (USCB); US Department of Commerce (USDC); U.S. Department of Agriculture (USDA); USDA Farm Service Agency (USDA FSA); U.S. Forest Service (USFS); Natural Earth Vector; Esri; Esri Canada; DigitalGlobe; Earthstar Geographics; CNES/Airbus DS; GeoEye; Getmapping; Aerogrid; Institut Géographique National (IGN)


If you have questions or comments about the State of the Interconnection, please contact WECC Support.