A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024
The United States high-voltage transmission network is described by two major public data sources that have never been systematically linked at the line level: FERC Form~1, which reports annual financial, cost, and engineering attributes for individual transmission lines, and the EIA/HIFLD Electric Power Transmission Lines layer, which provides geospatial line geometry. Here we present a harmonized, analysis-ready dataset that links these sources for individual transmission lines.
We parsed 31 years (1994-2024) of FERC Form~1 filings from legacy DBF and modern XBRL formats, standardized utility names, substation endpoints, voltages, lengths, and costs, and processed the EIA/HIFLD geospatial layer into per-line records. A blocking-and-scoring record-linkage procedure matched FERC records to EIA geometries using substation-name similarity, line length, and voltage. Matched records were enriched with conductor physical and electrical specifications and support-structure categories. The resulting dataset comprises 13,084 matched line-year records across 49 states and 171 utilities, each combining reported costs, engineering attributes, and geo-referenced geometry, supporting grid-cost modeling, infrastructure planning, and reliability research.
Citation Formats
TY - DATA
AB - The United States high-voltage transmission network is described by two major public data sources that have never been systematically linked at the line level: FERC Form~1, which reports annual financial, cost, and engineering attributes for individual transmission lines, and the EIA/HIFLD Electric Power Transmission Lines layer, which provides geospatial line geometry. Here we present a harmonized, analysis-ready dataset that links these sources for individual transmission lines.
We parsed 31 years (1994-2024) of FERC Form~1 filings from legacy DBF and modern XBRL formats, standardized utility names, substation endpoints, voltages, lengths, and costs, and processed the EIA/HIFLD geospatial layer into per-line records. A blocking-and-scoring record-linkage procedure matched FERC records to EIA geometries using substation-name similarity, line length, and voltage. Matched records were enriched with conductor physical and electrical specifications and support-structure categories. The resulting dataset comprises 13,084 matched line-year records across 49 states and 171 utilities, each combining reported costs, engineering attributes, and geo-referenced geometry, supporting grid-cost modeling, infrastructure planning, and reliability research.
AU - Yin, Rongxin
A2 - Nait Belaid, Youba
A3 - Heleno, Miguel
DB - Open Energy Data Initiative (OEDI)
DP - Open EI | National Laboratory of the Rockies
DO -
KW - energy
KW - power
KW - transmission lines
KW - FERC Electric Utility Annual Report
KW - geospatial
KW - United States
KW - FERC
KW - financial
KW - cost
KW - engineering
KW - transmission
KW - EIA
KW - HIFLD
KW - analysis
KW - grid-cost modeling
KW - infrastructure planning
KW - research
KW - data
KW - processed data
LA - English
DA - 2026/08/03
PY - 2026
PB - Lawrence Berkeley National Laboratory
T1 - A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024
UR - https://data.openei.org/submissions/8742
ER -
Yin, Rongxin, et al. A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Lawrence Berkeley National Laboratory, 3 August, 2026, Open Energy Data Initiative (OEDI). https://data.openei.org/submissions/8742.
Yin, R., Nait Belaid, Y., & Heleno, M. (2026). A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. [Data set]. Open Energy Data Initiative (OEDI). Lawrence Berkeley National Laboratory. https://data.openei.org/submissions/8742
Yin, Rongxin, Youba Nait Belaid, and Miguel Heleno. A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024. Lawrence Berkeley National Laboratory, August, 3, 2026. Distributed by Open Energy Data Initiative (OEDI). https://data.openei.org/submissions/8742
@misc{OEDI_Dataset_8742,
title = {A Harmonized Geospatial Dataset of U.S. Transmission Lines: Linking FERC Form 1 and HIFLD, 1994-2024},
author = {Yin, Rongxin and Nait Belaid, Youba and Heleno, Miguel},
abstractNote = {The United States high-voltage transmission network is described by two major public data sources that have never been systematically linked at the line level: FERC Form~1, which reports annual financial, cost, and engineering attributes for individual transmission lines, and the EIA/HIFLD Electric Power Transmission Lines layer, which provides geospatial line geometry. Here we present a harmonized, analysis-ready dataset that links these sources for individual transmission lines.
We parsed 31 years (1994-2024) of FERC Form~1 filings from legacy DBF and modern XBRL formats, standardized utility names, substation endpoints, voltages, lengths, and costs, and processed the EIA/HIFLD geospatial layer into per-line records. A blocking-and-scoring record-linkage procedure matched FERC records to EIA geometries using substation-name similarity, line length, and voltage. Matched records were enriched with conductor physical and electrical specifications and support-structure categories. The resulting dataset comprises 13,084 matched line-year records across 49 states and 171 utilities, each combining reported costs, engineering attributes, and geo-referenced geometry, supporting grid-cost modeling, infrastructure planning, and reliability research.},
url = {https://data.openei.org/submissions/8742},
year = {2026},
howpublished = {Open Energy Data Initiative (OEDI), Lawrence Berkeley National Laboratory, https://data.openei.org/submissions/8742},
note = {Accessed: 2026-10-10}
}
Details
Data from Aug 3, 2026
Last updated Sep 22, 2026
Submitted Aug 3, 2026
Organization
Lawrence Berkeley National Laboratory
Contact
Rongxin Yin
510.495.2486
Authors
Research Areas
Keywords
energy, power, transmission lines, FERC Electric Utility Annual Report, geospatial, United States, FERC, financial, cost, engineering, transmission, EIA, HIFLD, analysis, grid-cost modeling, infrastructure planning, research, data, processed dataDOE Project Details
Project Name Reconductoring Economic and Financial Analysis Tool
Project Number 41536
