This feature class/shapefile represents electric power transmission lines. Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available.

This feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data (HIFLD), depicts electric power transmission lines in the United States. Per HIFLD, "Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available."Data downloaded: 1/2/2023Data source: Transmission LinesData modification: noneFor more information: Electricity ExplainedSupport documentation: Transmission Lines

This feature class/shapefile represents electric power transmission lines. Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available. This feature class/shapefile is for the Homeland Infrastructure Foundation Level Database (HIFLD) https://gii.dhs.gov/HIFLD as well as the Energy modelling and simulation community. Additional Source Info: https://hifld-geoplatform.opendata.arcgis.com/datasets/geoplatform::electric-power-transmission-lines/aboutView Dataset on the Gateway

Homeland Infrastructure Foundation-Level Data (HIFLD) geospatial data sets containing information on Electric Power Transmission Lines.

BRADD GIS staff digized the substation layer by following transmission lines. It is not intended to be an authoritative source of data as there are likely substations missing from the dataset.Electric Company offices were digitized by BRADD staff using existing address point information.The transmission line feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data, depicts electric power transmission lines in the United States.DescriptionU.S. Electric Power Transmission LinesThis feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data (HIFLD), depicts electric power transmission lines in the United States. Per HIFLD, "Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available."138 Kilovolt Transmission LineData currency: This cached Esri service is checked weekly for updates from its federal source (Electric Power Transmission Lines)Data modification: noneFor more information: Electricity ExplainedFor feedback please contact: ArcGIScomNationalMaps@esri.comThe Homeland Infrastructure Foundation-Level DataPer HIFLD, "The Homeland Infrastructure Foundation-Level Data (HIFLD) Subcommittee was established…to address improvements in collection, processing, sharing, and protection of homeland infrastructure geospatial information across multiple levels of government, and to develop a common foundation of homeland infrastructure data to be used for visualization and analysis on all classification domains."

BRADD GIS staff digized the substation layer by following transmission lines. It is not intended to be an authoritative source of data as there are likely substations missing from the dataset.Electric Company offices were digitized by BRADD staff using existing address point information.The transmission line feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data, depicts electric power transmission lines in the United States.DescriptionU.S. Electric Power Transmission LinesThis feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data (HIFLD), depicts electric power transmission lines in the United States. Per HIFLD, "Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available."138 Kilovolt Transmission LineData currency: This cached Esri service is checked weekly for updates from its federal source (Electric Power Transmission Lines)Data modification: noneFor more information: Electricity ExplainedFor feedback please contact: ArcGIScomNationalMaps@esri.comThe Homeland Infrastructure Foundation-Level DataPer HIFLD, "The Homeland Infrastructure Foundation-Level Data (HIFLD) Subcommittee was established…to address improvements in collection, processing, sharing, and protection of homeland infrastructure geospatial information across multiple levels of government, and to develop a common foundation of homeland infrastructure data to be used for visualization and analysis on all classification domains."

This feature class/shapefile represents electric power transmission lines. Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available. These data are for the Homeland Infrastructure Foundation Level Database (HIFLD) (https://gii.dhs.gov/HIFLD) as well as the Energy modelling and simulation community.Link to metadata: https://www.arcgis.com/sharing/rest/content/items/70512b03fe994c6393107cc9946e5c22/info/metadata/metadata.xml?format=default&output=htmlNote: This layer is a feature service, which means it can be used for visualization and analysis throughout the ArcGIS Platform. This layer is not editable.

This feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data (HIFLD), depicts electric power transmission lines in the United States. The process of delivering electricity starts at the power plants that generate electricity that is delivered to customers through transmission lines. High Voltage transmission lines, such as those that hang between tall metal towers, carry electricity over long distances to meet customer needs. Higher voltage electricity is more efficient and less expensive for long distance electricity transmission. Transformers at substations increase (step up) or reduce (step down) voltages to adjust to the different stages of the journey from the power plant on long-distance transmission lines to distribution lines that carry electricity to homes and businesses. Transmission lines are operated at relatively high voltages varying from 69 Kilovolts up to 765 Kilovolts.138 Kilovolt Transmission LineData download location and currency: Electric Power Transmission Lines > OverviewData modification(s): noneFor more information: Electricity ExplainedFor feedback please contact: ArcGIScomNationalMaps@esri.comThumbnail image courtesy of: Oran ViriyincyOther Federal User Community federally focused content that may interest youU.S. Independent Establishments and Gov't Corps

This dataset provides estimated hourly dynamic line ratings for ~84,000 transmission lines across the contiguous United States from 2007-2013. The calculation methods are described in the presentation linked below, and the associated open-source Python code repository is linked in the Resources section below. Abbreviations used in filenames and descriptions are: - SLR: static line ratings - ALR: ambient-temperature-adjusted line ratings - NLR: ambient-temperature- and day/night-irradiance-adjusted line ratings - CLR: ambient-temperature- and clear-sky-irradiance-adjusted line ratings - ILR: ambient-temperature- and measured-irradiance-adjusted line ratings - DLR: full dynamic line ratings (including air temperature/pressure, wind speed/direction, and measured irradiance) Transmission lines are referenced by their ID in the Homeland Infrastructure Foundation-Level Data (HIFLD) on Transmission Lines (linked in Resources section). Time indices are in UTC. The data files contain ratios between modeled hourly ratings and modeled static ratings. Columns are indexed by HIFLD ID; rows are indexed by hourly timestamps from 2007-2013 (UTC). A data directory is also included in the Resources section. The SLR files contain modeled static ratings (the denominator of the ratios in the files described above) in amps. As described in the presentation linked in the Resources section below, SLR calculations assume an ambient air temperature of 40 C, air pressure of 101 kPa, wind speed of 2 feet per second (0.61 m/s) perpendicular to the conductor, global horizontal irradiance of 1000 W/m^2, and conductor absorptivity and emissivity of 0.8. Conductor assumptions are Linnet for ~69 kV and below, Condor for ~115 kV, Martin for ~230 kV, and Cardinal for ~345 kV and above. Caveats and Limitations Results are sensitive to the weather data used. Validation studies on the WIND Toolkit and NSRDB are available at: - King, J. et al. "Validation of Power Output for the WIND Toolkit", 2014 (https://www.nrel.gov/docs/fy14osti/61714.pdf) - Draxl, C. et al. "Overview and Meteorological Validation of the Wind Integration National Dataset Toolkit", 2015 (https://www.nrel.gov/docs/fy15osti/61740.pdf) - Sengupta, M. et al. "Validation of the National Solar Radiation Database (NSRDB) (2005-2012)", 2015 (https://www.nrel.gov/docs/fy15osti/64981.pdf) - Habte, A. et al. "Evaluation of the National Solar Radiation Database (NSRDB Version 2): 1998-2015", 2017 (https://www.nrel.gov/docs/fy17osti/67722.pdf) More work is required to determine how well ratings calculated from NSRDB and WIND Toolkit data reflect the actual ratings observed by installed sensors (such as sag or tension monitors). In general, ratings calculated from modeled weather data are not a substitute for direct sensor data. Assuming a single representative conductor type (ACSR of a single diameter) for each voltage level is an important simplification; reported line ratings at a given voltage level can vary widely. HIFLD line routes are primarily based on imagery instead of exact construction data and may have errors. We use historical weather data directly; calculated line ratings are thus more indicative of real-time ratings than forecasted ratings

This feature class/shapefile represents electric power transmission lines. Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available. The following updates have been made since the previous release: 1,166 features added.Full details: https://hifld-geoplatform.hub.arcgis.com/datasets/geoplatform::transmission-lines/about

Analysis of ‘California Electric Substations’ provided by Analyst-2 (analyst-2.ai), based on source dataset retrieved from https://catalog.data.gov/dataset/7b7a4c02-e254-4f86-997d-dc55ef656b85 on 27 January 2022.

--- Dataset description provided by original source is as follows ---

The California Energy Commission (CEC) Electric Substation geospatial data layer has been created to display the locations of substations in California. It contains point features representing transmission substations and some distribution substations in California. These substations are fed by electric transmission lines and are used to step-up and step-down the voltage of electricity being carried by the lines, or simply to connect together various lines and maintain reliability of supply. These substations can be located on the surface within fenced enclosures, within special purpose buildings, on rooftops (in urban environments), or underground. A substation feature is also used to represent a location where one transmission line "taps" into another. When used in association with the CEC Power Plant and CEC Electric Transmission Lines geospatial data layers, viewers can analyze the geographic relationships with the substation across utilities, counties and state.

The data has been gathered from two sources - internal CEC data and the Department of Homeland Security's - Homeland Infrastructure Foundation-Level Data (HIFLD). The CEC data was created from a project spanning many years and was previously updated in 2016. The data was derived from utility companies and USGS topographic map. Some of the data was rectified from GE and Platts substation geospatial data. The sources for the substation point digitizing are including sub-meter resolution of Digital Globe, Bing, Google, ESRI and NAIP aerial imageries, with scale at least 1:10,000. Occasionally, USGS Topographic map, Google Street View and Bing Bird's Eye are used to verify the precise location of a facility.

The substation data, as one of the CEC's California Energy Infrastructure spatial data will be used to:

1. Support the CEC/STEP/Strategic Transmission Planning and Corridor Designation Office in corridor study and transmission line siting;

2. Support the CEC staffs' various analysis by providing general geographic reference information;

3. Enhance communication between and among government agencies on emergency management, resource management, economic development, and environmental study;

4. Provide illustration of critical infrastructure spatial data to the public or other agencies in hard copy format.

--- Original source retains full ownership of the source dataset ---

Electric power transmission lines (including some underground lines). Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system.This feature class/shapefile represents electric power transmission lines. Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available. This feature class/shapefile is for the Homeland Infrastructure Foundation Level Database (HIFLD) https://gii.dhs.gov/HIFLD as well as the Energy modelling and simulation community. Additional Source Info: https://hifld-geoplatform.opendata.arcgis.com/datasets/geoplatform::electric-power-transmission-lines/about

U.S. Electric Power Transmission LinesThis feature layer, utilizing data from Homeland Infrastructure Foundation-Level Data (HIFLD), depicts electric power transmission lines in the United States. Per HIFLD, "Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available."138 Kilovolt Transmission LineData downloaded: 5/16/2025Data source: Transmission LinesData modification: noneFor more information: Electricity ExplainedSupport documentation: Transmission LinesFor feedback, please contact: ArcGIScomNationalMaps@esri.comThe Homeland Infrastructure Foundation-Level DataPer HIFLD, "The Homeland Infrastructure Foundation-Level Data (HIFLD) Subcommittee was established…to address improvements in collection, processing, sharing, and protection of homeland infrastructure geospatial information across multiple levels of government, and to develop a common foundation of homeland infrastructure data to be used for visualization and analysis on all classification domains."

Data compiled from California Energy Commission staff from georeferenced electric territory maps and the United States Department of Homeland Security, Homeland Infrastructure Foundation-Level Data (HIFILD), https://hifld-geoplatform.opendata.arcgis.com/datasets/geoplatform::electric-retail-service-territories-2/about

Community Choice Aggregation information provided by Cal-CCA.

Boundaries are approximate, for absolute territory information, contact the appropriate load serving entity. Not all electric load serving entities are represented, if you have information on missing territory locations, please contact GIS@energy.ca.gov.

For more information on California Load Serving Entities visit this website: https://www.energy.ca.gov/data-reports/energy-almanac/california-electricity-data/electric-load-serving-entities-lses

This web service represents the Homeland Infrastructure Foundation Level Database (HIFLD) GIS data: Electric Substations and Electric Transmission Lines, versions 9/19/2019. These data were downloaded from hifld-geoplatform.opendata.arcgis.com by CRSSA, Rutgers University, and prepared for visualization purposes on the MARCO Portal. HIFLD Electric Substations: These data represent electric power substations primarily associated with electric power transmission. In this layer, substations are considered facilities and equipment that switch, transform, or regulate electric power at voltages equal to, or greater than, 69 kilovolts. Substations with a maximum operating voltage less than 69 kilovolts may be included, depending on the availability of authoritative sources, but coverage of these features should not be considered complete. The Substations feature class/shapefile includes taps, a location where power on a transmission line is tapped by another transmission line. HIFLD data version: 9/19/19. Transmission Lines: This feature class/shapefile represents electric power transmission lines. Transmission Lines are the system of structures, wires, insulators and associated hardware that carry electric energy from one point to another in an electric power system. Lines are operated at relatively high voltages varying from 69 kV up to 765 kV, and are capable of transmitting large quantities of electricity over long distances. Underground transmission lines are included where sources were available. HIFLD data version: 9/19/19. NOTE: The substations and transmission lines data were clipped by state boundaries from Maine to the Virginia-North Carolina border. The states are as follows: Maine, New Hampshire, Massachusetts, Rhode Island, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, and Virginia.Link to metadata.Note: This layer is a feature service, which means it can be used for visualization and analysis throughout the ArcGIS Platform. This layer is not editable.

This submission contains the link and geospatial materials used in the Energy Assets Transformation Web Mapping Application. The zip file contains 19 geospatial layers in a file geodatabase called EAT.gdb to be grouped in the following categories. 1. Industrial Assets: Coal Generation Units Retirements 2012-2040 (EIA); Examples of Repurposing Projects (32 projects in total); Abandoned Coal Mines (CORD, SkyTruth); Abandoned or Orphaned Wells (for ten states only). 2. Energy Transition Communities: 48C (e) Tax Credits - Designated Energy Communities (IRA); Index of Deep Disadvantage; Local Energy Action Program (LEAP); EJ Index for Proximity to Hazardous Waste (EPA). 3. Regional Landscape: State-Level Funding Programs (relevant to repurposing projects, for 2022 and 2023 only); Coal Flows from Mine to Plant 2021 (EIA), Variable Renewable Energy Shares (Wind and Solar, 2021, EIA). 4. Supporting Infrastructure: Railroads (HIFLD), Electric Power Transmission Lines (HIFLD), Major Highways (NHPN, DOT), Major Ports (National Atlas of the U.S.); Independent System Operators (HIFLD), NERC Regions and Subregions (HIFLD).

Overview Infrastructure - Powerlines is part of the Highly Valued Resource or Asset (HVRA) data used in the National Wildfire Risk Assessment for Forest Service Lands (NaWRA, Dillon 2020). Powerlines can be used as a Sub-HVRA within the Map Values, Exposure Analysis and Quantitative Wildfire Risk Assessment functionality within the Interagency Fuel Treatment Decision Support System (IFTDSS, https://iftdss.firenet.gov). Data Details Powerlines consists of electrical power transmission lines. The source data was downloaded from the Homeland Infrastructure Foundation-Level Data (HIFLD, https://gii.dhs.gov/hifld/) on February 14, 2017. The inactive electrical power transmission lines were excluded for IFTDSS. Citations Dillon, Gregory K. 2020. Results and application of the National Wildfire Risk Assessment. In: Hood, Sharon M.; Drury, Stacy; Steelman, Toddi; and Steffens, Ron, eds. Proceedings of the Fire Continuum—Preparing for the future of wildland fire; 2018 May 21-24; Missoula, MT. Proceedings RMRS-P-78. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. Pgs 252-257.

Fireshed Community Infrastructure Data used in the Secretary's Memo 2a1 Updated Fireshed Map with Ecosystem and Equity Layers web map. Section 2a1 of the June 2022 Secretary’s Memorandum 1077-004 on Climate Resilience and Carbon Stewardship of America’s National Forests and Grasslands directed the Forest Service to spatially identify risks to ecosystem values to inform decision making by updating the fireshed risk map to include additional ecosystem and equity layers. Data includes the following:Communication Sites (Homeland Infrastructure Foundation-Level Data [HIFLD 2022])Dams (National Inventory of Dams, 2022)Emergency Services - Fire Stations & EMS Stations (HIFLD 2022)Federal Campgrounds (USFS and BLM, NIFC 2020)Heritage - Historic Buildings (NPS National Register of Historic Places)Hospitals (HIFLD 2022)Power Plants (HIFLD 2022)Substations (HIFLD 2022)Major Roads (HIFLD 2022) - “Major Roads” identified as federal or state highways onlyNatural Gas Pipelines (HIFLD)Transmission Lines (HIFLD)Composite Transmission Line and Major Road Density*Composite Infrastructure Density Index (composite index using the following layers only -1) electric power supply infrastructure (power plants, substations, transmission lines), 2) major roads, 3) communications sites, 4) dams 5) natural gas pipelines, and 6) emergency services (fire/EMS/hospitals).** All density values are a normalized distribution of Count/Acre on a 1-5 scale.*The composite index only informs where infrastructure is concentrated, not whether or not it is at risk of or exposed to wildfire.For more information refer to the following documentation: NWRA DocumentationThe Updated Fireshed Map Methodology Document discusses the methodology used to derive the density, exposure, and risk indices at the fireshed scale. The Suitability Modeler User Guide contains detailed help on how to use the Model Layers tab. The Updated Fireshed Map With Ecosystem and Equity Layers- Data Summary contains detailed information on the sources and references of derived data.

Infrastructure data utilized includes the following assets for reference:•Communication Sites (Homeland Infrastructure Foundation-Level Data [HIFLD 2022])•Dams (National Inventory of Dams, 2022)•Emergency Services - Fire Stations & EMS Stations (HIFLD 2022)•Federal Campgrounds (USFS and BLM, NIFC 2020)•Heritage - Historic Buildings (NPS National Register of Historic Places)•Hospitals (HIFLD 2022)•Power Plants (HIFLD 2022)•Substations (HIFLD 2022)•Major Roads (HIFLD 2022) - “Major Roads” identified as federal or state highways only•Natural Gas Pipelines (HIFLD)•Transmission Lines (HIFLD)For more information refer to the following documentation: NWRA Documentation

This feature layer depicts wind energy infrastructure including industrial-scale wind turbines, electric substations and electric transmission lines in the State of Colorado. The data is derived from the U.S. Geological Survey (USGS) and Homeland Infrastructure Foundation Level Data (HIFLD). A collaboration among USGS scientists related to energy development and environmental consequences began in 2008. This group anticipated finding accurate information on wind energy facilities and turbines in the public sphere, like the type of data available for oil and gas wells. However, turbine information was lacking, and it became apparent that scientists, regulatory agencies, nongovernmental organizations, and other decision-makers all needed spatially accurate wind turbine information. Each of the 1,537 turbine locations includes corresponding facility information and turbine technical specifications. Electric substations are facilities and equipment that switch, transform or regulate electric voltage. The electric substation feature class in this service includes taps, which are locations where power on a transmission line is tapped by another transmission line. Electric substations are part of the electric network system helping to move electricity to where it is needed.Electric power transmission lines are the system of structures, wires, insulators and associated hardware that carry electric power from one point to another in an electric power network. Lines are operated at high voltages varying from 69 kV (Kilo Volts) up to 765 kV and can transmit large quantities of electricity over long distances. The underground transmission lines are included where sources were available.Wind Energy InfrastructureData currency: March 2, 2014 (Turbines) and August 08, 2017 (Electric Substations and Transmission Lines)Data sources: Onshore Industrial Wind Turbine Locations and Electric Substations and Electric Power Transmission LinesFor more information, please visit: Data Series 817 and HIFLDFor feedback: ArcGIScomNationalMaps@esri.comThumbnail source image courtesy of: Thomas KohlerOther Federal User Community federally focused content that may interest youDepartment of the InteriorU.S. Geological SurveyDepartment of Homeland SecurityHomeland Infrastructure Foundation Level Data