Data layers & sources
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Layer Name Data Source Citation Date Published Web Link Download
Planned Transmission Projects
Planned Transmission Projects Horizon Energy Systems Abramson, E., Ramsay, E., McFarlane, D., Prorok, M., Our Grid Future Planned Transmission Projects National Database, Horizon Energy Systems, February 2026. Februrary 2026 Our Grid Future
Access
Existing Transmission Lines
Existing Transmission Lines US Dept of Homeland Security HIFLD US Department of Homeland Security, Homeland Infrastructure Foundation-Level Data, Transmission Lines, December 11, 2022, https://hifld-geoplatform.hub.arcgis.com/datasets/geoplatform::transmission-lines/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. December 11, 2022 HIFLD Download
Existing Electric Substations
Existing Electric Substations ORNL, LANL, INL, NGA & HSIP Oak Ridge National Laboratory (ORNL), Los Alamos National Laboratory (LANL), Idaho National Laboratory (INL), National Geospatial-Intelligence Agency (NGA), Homeland Security Infrastructure Program (HSIP) Team, Electrical Substations, April 2022, https://gem.anl.gov/tool. Modified by Horizon Climate Group, 2025, ourgridfuture.org. April 2022 ANL GEM Download
B2B High Voltage DC Ties
B2B High Voltage DC Ties Horizon Climate Group, 2025, based on NREL and US DOE Elizabeth Abramson, Horizon Climate Group, US B2B High Voltage DC Ties shapefile, based on NREL and US DOE, April 2025, ourgridfuture.org April 2025 NREL US DOE Download
NIETC Corridors
NIETC Corridors US DOE U.S. Department of Energy, Grid Deployment Office, “Phase 3 Potential National Interest Electrical Transmission Corridors (December 16, 2024),” December 16, 2024, https://gem.anl.gov/tool. Modified by Horizon Climate Group, 2025, ourgridfuture.org. December 16, 2024 ANL GEM Download
Regional Transmission Organizations
Regional Transmission Organizations ORNL, LANL, INL, NGA & HSIP Oak Ridge National Laboratory (ORNL), Los Alamos National Laboratory (LANL), Idaho National Laboratory (INL), National Geospatial-Intelligence Agency (NGA), Homeland Security Infrastructure Program (HSIP) Team, Independent System Operators, November 8, 2021, https://hub.arcgis.com/datasets/50f80920d36e435d9a34db2bd0fd3ad8_0/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. November 8, 2021 View Source Download
Electric Utility Territories
Electric Utility Territories ORNL, LANL, INL, NGA & HSIP Oak Ridge National Laboratory (ORNL), Los Alamos National Laboratory (LANL), Idaho National Laboratory (INL), National Geospatial-Intelligence Agency (NGA) Homeland Security Infrastructure Program (HSIP) Team, Electric Retail Service Territories, November 8, 2021, https://atlas.eia.gov/datasets/f4cd55044b924fed9bc8b64022966097_0/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. November 8, 2021 EIA Download
FERC Order 1000 Regions
FERC Order 1000 Regions CGI & Horizon, 2024, based on FERC Aparna Narang, Clean Grid Initiative, FERC Order 1000 Regions shapefile, based on Federal Energy Regulatory Commission, December 2024. Modified by Horizon Climate Group, 2025, ourgridfuture.org. December 2024 FERC Download
NERC Regions
NERC Regions EIA & NERC Elizabeth Abramson, Horizon Climate Group, NERC Regions shapefile, based on US EIA and North American Electric Reliability Corporation, April 2025, ourgridfuture.org. April 2025 EIA NERC Download
Interconnection Seams
Interconnection Seams EIA & NERC Elizabeth Abramson, Horizon Climate Group, Interconnection Seams shapefile, based on US EIA and North American Electric Reliability Corporation, April 2025, ourgridfuture.org. April 2025 EIA NERC Download
Electric Generation Plants
Electric Generation Plants EPA eGRID 2022 US Environmental Protection Agency, Emissions & Generation Resource Integrated Database (eGRID), 2022 data, January 2024, https://www.epa.gov/egrid. Modified by Horizon Climate Group, 2025, ourgridfuture.org. January 2024 EPA eGRID Download
Coal Plants & Retirement Global Energy Monitor, 2025 Global Coal Plant Tracker, Global Energy Monitor, January 2025 Release, https://globalenergymonitor.org/projects/global-coal-plant-tracker/download-data/. Modified by Horizon Climate Group, 2025, ourgridfuture.org. January 2025 GEM Download
Industrial Facilities
Industrial Facilities US EPA U.S. Environmental Protection Agency (EPA), “Greenhouse Gas Reporting Program (GHGRP), 2023 Data Summary Spreadsheets,” August 16, 2024, https://www.epa.gov/ghgreporting/data-sets. Modified by Horizon Climate Group, 2025, ourgridfuture.org. August 16, 2024 EPA GHGRP Download
Wind Electricity Projects
Wind Electricity Projects United States Wind Turbine Database v7.0 Hoen, B.D., Diffendorfer, J.E., Rand, J.T., Kramer, L.A., Garrity, C.P., and Hunt, H.E., 2018, United States Wind Turbine Database v7.0 (May 10, 2024): U.S. Geological Survey, American Clean Power Association, and Lawrence Berkeley National Laboratory data release,  https://doi.org/10.5066/F7TX3DN0. May 10, 2024 USGS Download
Solar Electricity Projects
Solar Electricity Projects United States Large-Scale Solar Photovoltaic Database v1.0 Fujita, K.S., Ancona, Z.H., Kramer, L.A., Straka, M., Gautreau, T.E., Garrity, C.P., Robson, D., Diffendorfer, J.E., and Hoen, B., 2023, United States Large-Scale Solar Photovoltaic Database v1.0 (November, 2023): U.S. Geological Survey and Lawrence Berkeley National Laboratory data release, https://doi.org/10.5066/P9IA3TUS. November 2023 USGS Download
Urban Areas
Urban Areas US Census Bureau US Census Bureau, Geography Division, 2022 TIGER/Line Shapefiles: Urban Areas (2020), January 6, 2023, https://www.census.gov/cgi-bin/geo/shapefiles/index.php?year=2022&layergroup=Urban+Areas. Modified by Horizon Climate Group, 2025, ourgridfuture.org. January 6, 2023 US Census Download
Tribal & Indigenous Lands
Tribal & Indigenous Lands US Census Bureau US Census Bureau Geography Division 2024 TIGER/Line® Shapefiles, American Indian/Alaska Native/Native Hawaiian Areas, 2024, https://www.census.gov/cgi-bin/geo/shapefiles/index.php?year=2024&layergroup=American+Indian+Area+Geography. September 25, 2024 US Census Download
Disadvantaged Communities
Disadvantaged Communities Council on Environmental Quality (CEQ) Council on Environmental Quality, Climate and Economic Justice Screening Tool Version 2.0, December 2024, hosted by the Public Environmental Data Project, https://edgi-govdata-archiving.github.io/j40-cejst-2/en/. Modified by Horizon Climate Group, 2025, ourgridfuture.org. December 2024 GitHub Download
National Register of Historic Places
National Register of Historic Places National Park Service, 2024 Stutts M. August 2024. National Register of Historic Places. National Park Service. https://irma.nps.gov/DataStore/Reference/Profile/2305746. Modified by Horizon Climate Group, 2025, ourgridfuture.org. August 2024 NPS Download
National, State, and Regional Parks
National, State, and Regional Parks Esri and TomTom North America Esri and TomTom North America, Inc., USA Parks, October 14, 2024, https://www.arcgis.com/home/item.html?id=578968f975774d3fab79fe56c8c90941. October 14, 2024 View Source Download
BLM Managed Lands
BLM Managed Lands US Bureau of Land Management (BLM) Bureau of Land Management, BLM National SMA Surface Management Agency Area Polygons, November 1, 2023, https://gbp-blm-egis.hub.arcgis.com/datasets/blm-national-sma-surface-management-agency-area-polygons/about. November 1, 2023 View Source Download
BLM Administrative Units
BLM Administrative Units US Bureau of Land Management (BLM) US Bureau of Land Management, BLM Administrative Unit Boundaries and Office Locations, accessed March 19, 2025, https://gis.blm.gov/arcgis/rest/services/admin_boundaries/BLM_Natl_AdminUnit/MapServer. Modified by Horizon Climate Group, 2025, ourgridfuture.org March 19, 2025 BLM Download
BLM Areas of Critical Concern
BLM Areas of Critical Concern US Bureau of Land Management (BLM), 2024 US Bureau of Land Management, BLM Natl Designated Areas of Critical Environmental Concern Polygons, December 2024, https://gbp-blm-egis.hub.arcgis.com/datasets/11c9e34831c7446a8202b334bc64898a/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. December 2024 BLM Download
Critical Habitat for Threatened & Endangered Species
Critical Habitat for Threatened
& Endangered Species		 US Fish & Wildlife Service US Fish & Wildlife Service Environmental Conservation Online System (ECOS), Critical Habitat for Threatened & Endangered Species, January 7, 2025, https://ecos.fws.gov/ecp/report/table/critical-habitat.html. January 7, 2025 US FWS Download
Fossil Fuel Pipelines
Crude Oil Pipelines US EIA US Energy Information Administration, Crude Oil Pipelines, April 2020, https://atlas.eia.gov/datasets/eia::crude-oil-pipelines/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. April 2020 EIA Download
Hydrocarbon Gas Liquids (HGL) Pipelines US EIA US Energy Information Administration, Hydrocarbon Gas Liquids (HGL) Pipelines, April 2020, https://atlas.eia.gov/datasets/eia::hydrocarbon-gas-liquids-hgl-pipelines/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. April 2020 EIA Download
Natural Gas Pipelines US EIA US Energy Information Administration, Natural Gas Interstate and Intrastate Pipelines, April 2020, https://atlas.eia.gov/datasets/4a158d2113f145039f71b80d07e2c19c_0/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. April 2020 EIA Download
Petroleum Products Pipelines US EIA US Energy Information Administration, Petroleum Product Pipelines, April 2020, https://atlas.eia.gov/datasets/eia::petroleum-product-pipelines/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org. April 2020 EIA Download
Political Districts
Congressional Districts US DOT US Department of Transportation Bureau of Transportation Statistics, Congressional Districts, Aril 27, 2025, https://data-usdot.opendata.arcgis.com/datasets/usdot::congressional-districts/about. Modified by Horizon Climate Group, 2025, ourgridfuture.org.org. April 2025 View Source Download
Governor and US Senate US EPA Elizabeth Abramson, Horizon Climate Group, Governor and US Senate Representation, based on United States Senate and National Governors Association, May 2025. May 2025 Governor Senate Download
US Counties Horizon Climate Group, 2025, based on US Census Bureau Elizabeth Abramson, Horizon Climate Group, Adapted 2018 Cartographic Boundary Files, based on US Census Bureau, April 2025, ourgridfuture.org. April 2025 2018 2022 Download
Other Infrastructure
National Highway System US DOT, 2025 US Department of Transportation Federal Highway Administration, NHS_2025-03-27, March 2025, https://www.fhwa.dot.gov/planning/national_highway_system/nhs_maps/. Modified by Horizon Climate Group, 2025, ourgridfuture.org. March 2025 DOT Download
Railroads US DOT, 2021 US Department of Transportation Bureau of Transportation Statistics, USA Railroads (Esri; October 6, 2021), https://www.arcgis.com/home/item.html?id=bca2aa04ab424d8c98d471d2be62a48c. Modified by Horizon Climate Group, 2025, ourgridfuture.org. October 6, 2021 DOT Download
Basemaps
OpenStreetMap Default Basemap Open Street Map Open Street Map, Default Basemap, 2025 2025 Link
USGS TNM Topo Base Map United States Geological Survey (USGS) United States Geological Survey, USGS TNM Topo Base Map, February 2025, https://basemap.nationalmap.gov/arcgis/rest/services/USGSTopo/MapServer/. February 2025 Link
OpenTopoMap Stefan Erhardt, Friedrich-Alexander University Erlangen-Nuremberg Stefan Erhardt, OpenTopoMap, January 22, 2023 January 22, 2023 Link
Open Street Map Humanitarian Basemap Open Street Map Open Street Map, Humanitarian Basemap, 2025 2025 Link
NASA GIBS VIIRS Earth at Night 2012 Global Imagery Browse Services (GIBS), operated by the NASA/GSFC/Earth Science Data and Information System with funding provided by NASA/HQ GIBS, NASA, VIIRS Earth at Night, 2012 2012 Link
World Terrain Base Esri, USGS, NOAA Esri, United States Geological Survey, and National Oceanic and Atmospheric Administration, World Terrain Base, May 2020, https://www.arcgis.com/home/item.html?id=c61ad8ab017d49e1a82f580ee1298931. May 27, 2020 Link
World Topo Map Esri, HERE, Garmin, Intermap, increment P Corp., GEBCO, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), OpenStreetMap contributors, and the GIS User Community Esri, HERE, Garmin, Intermap, increment P Corp., GEBCO, USGS, FAO, NPS, NRCAN, GeoBase, IGN, Kadaster NL, Ordnance Survey, Esri Japan, METI, Esri China (Hong Kong), OpenStreetMap contributors, and the GIS User Community, World Topo Map, January 2024, https://www.arcgis.com/home/item.html?id=30e5fe3149c34df1ba922e6f5bbf808f. January 3, 2024 Link
USA Topo Maps National Geographic Society, i-cubed National Geographic Society and i-cubed, USA Topo Maps, April 2019, https://www.arcgis.com/home/item.html?id=99cd5fbd98934028802b4f797c4b1732. April 18, 2019 Link
Carto Light / Positron CartoDB CartoDB, Positron Basemap, 2018 2018 Link
Carto Dark / Dark Matter CartoDb CartoDB, Dark Matter Basemap, 2018 2018 Link
Google Maps Satellite Imagery Google Maps Google Maps, Satellite Imagery, 2025 2025 Link
Google Maps Terrain Layer Google Maps Google Maps, Terrain Layer, 2025 2025 Link
About Our Grid Future
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Februray 2026

Our Grid Future
, 2025, is developed and maintained by
Horizon Energy Systems
.
Project development and data collection on planned transmission projects was conducted in association with
Horizon Energy Systems
and
Great Plains Institute
. The project team would like to thank Aparna Narang and Hella Cohen for their collaboration.
Authors
Software development and design:Dane McFarlane
Research and GIS analysis:Elizabeth Abramson and Esther Ramsay
Additional outreach:Diana Gastelum, Maya Chiclote,
and Matt Prorok
Suggested Citation:
For the planned transmission data layer:
Abramson, E., Ramsay, E., McFarlane, D., Prorok, M., Our Grid Future Planned Transmission Projects National Database, Horizon Energy Systems, February 2026
For maps, data layers, and other information:
Horizon Energy Systems, Our Grid Future, February 2026.
http://www.ourgridfuture.org
Contact: Dane McFarlane, Horizon Energy Systems
Planned Transmission Projects
GIS Data Layer
February 18, 2026
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The Our Grid Future Planned Projects layer was created by Elizabeth Abramson, Esther Ramsay, and Dane McFarlane, Horizon Energy Systems, 2026, in coordination with Matthew Prorok, Diana Gastelum, and Maya Chilcote, Great Plains Institute.
Download the transmission database and GIS shapefile:
Access data
Download GIS shapefile (.zip)
Download database (.xlsx)
Goal
Create and share a geographic database of planned high-capacity electric transmission lines in the United States.

Rationale
Creating, maintaining, and publishing the planned transmission projects data layer is meant to:
  • Build solutions to beneficial transmission planning
  • Enable greater transparency and early engagement of stakeholders
  • Work constructively to solve siting issues early on
  • Help the advocacy community identify priorities for planning and permitting work
  • Allow users to see where in the country transmission planning has already occurred at scale and where it has not
Included Projects
The planned projects layer is focused on high-voltage transmission expansion and new system capacity, which are key to enabling:
  • Regional and national electric decarbonization
  • Economic growth
  • Grid resilience
The data layer includes projects that are:
  • 230 kV or higher
  • New lines
  • Line upgrades
  • Line rebuilds
  • Line reconductoring projects
Authors
Research and GIS analysis:Elizabeth Abramson and Esther Ramsay
Research and outreach:Matt Prorok, Diana Gastelum,
and Maya Chilcote
Software development and design:Dane McFarlane
Suggested Citation
Abramson, E., Ramsay, E., McFarlane, D., Prorok, M., Our Grid Future Planned Transmission Projects National Database, Horizon Energy Systems, February 2026
Transmission Regions
US BLM Lands
States & Counties
Carto Light
Carto Dark
OpenStreetMap
OpenTopoMap
Satellite
Contour
ESRI Topo
ESRI Terrain
NASA Night
Google Terrain
OSM Alt
USGS TOPO
Basemap
Electric Transmission
Electric Substations
Electric Utilities
Electric Generation
Natural Lands
Communities
Other Infrastructure
+
–
Legend
hide→
Map Legend
Planned Transmission Projects
Planned Transmission Line
Substation in Planned Project
NIETC Corridor
Transmission Study
Existing Transmission
Under 69kV
69 to 115kV
115 to 230kV
Above 230kV
Unknown Voltage
Existing Substation
Communities
Urban Area
Disadvantaged Community (CEQ)
Tribal & Indigenous Area
Registered Historic Place
Registered Historic Area
Natural Lands
National Park
State Park
Regional Park
Habitat for Critically Endangered Species (USFWS)
Area of Critical Environmental Concern (BLM)
Bureau of Land Management
BLM Managed Land
BLM Office
BLM Field Office Region
BLM District
BLM State Region
Electric Generation
Scaled by MW capacity
Natural Gas
Coal
Biomass
Hydropower
Wind
Solar
Oil
Nuclear
Geothermal
Other Fossil Fuel
Other Fuel: Waste Heat, Hydrogen, Purchased, or Unknown
Coal Power Plants
Scaled by MW capacity
Coal Power Plant
Renewable Projects
Wind Project
Solar Project
GHG Emitters
Scaled by annual CO2e emissions
Ammonia
Cement & Lime
Chemicals
Coal Power Plant
Ethanol
Gas Power Plant
Gov't, Edu., & Health
Iron & Steel
Misc. Industry
Other Power Plant
Pet. & NG Systems
Petrochemicals
Petroleum Refining
Pulp & Paper
Waste
Electric Utilities
Investor Owned (IOU)
Municipal
Cooperative
ISO & RTO Regions
MISO
SPP
PJM
ERCOT
CAISO
ISO-NE
NYISO
NERC Regions
Northeast Power Coordinating Council (NPCC)
ReliabilityFirst Corporation (RFC)
SERC Reliability Corporation (SERC)
Western Electricity Coordinating Council (WECC)
Indeterminate - various NERC membership
Southwest Power Pool (SPP)
Texas Reliability Entity (TRE)
Midwest Reliability Organization (MRO)
FERC Regions
MISO North
MISO South
SPP
PJM
CAISO
ISO-NE
Northern Grid
WestConnect
Southeast
NYISO
Other Infrastructure
B2B HVDC Tie
Interconnection Seam
Crude Oil Pipeline
HGL Pipeline
Natural Gas Pipeline
Petroleum Pipeline
Interstate Highway
Other Highway
Railroad
Political Landscape
Democratic
Republican
Basemap credit:
Planned transmission by voltage:
< 230 kV
≥ 230 kV
≥ 345 kV
≥ 500 kV
≥ 765 kV
Planned transmission by status:
Complete
Construction
Engineering, Design, and Routing
On Hold or Terminated
Permitting
Planning
Unknown
Planned transmission by type:
New
Upgrade
Rebuild
Reconductor
Mixed
Planned transmission by RTO:
MISO
SPP
PJM
ERCOT
CAISO
ISO-NE
NYISO
Planned transmission by State Permitting Status:
Not required
Not Started
Permitting Underway
Partially Complete
Complete
Not applicable
Planned transmission by Federal Permitting Status:
Not required
Not Started
Permitting Underway
Record of Decision Issued
Complete
Not applicable
Created by
Horizon Energy Systems, 2025
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Download the database:
To access the planned transmission shapefile and database, please provide your contact information.
Your information will NOT be shared publicly, and will only be used to measure the use of Our Grid Future.
By downloading the database, you agree to use the following citation in any published work or presentation where it is utilized:
Abramson, E., Ramsay, E., McFarlane, D., Prorok, M.,Our Grid Future Planned Transmission Projects National Database, Horizon Energy Systems, February 2026