HIFLD Transmission Lines

This dataset maps the physical transmission backbone of the US power grid as polyline geometry, tracing each line from one substation endpoint to the other.

hifld.transmission_linesHIFLDInfrastructure data

Open in Data Open on map

One row per: event_time x hifld_id; Snapshot cadence
Evidence: Observed market data; Published observations from the named source
Time basis: Point-in-time records; UTC · event_time

Overview

Each segment carries attributes including the owning utility and a voltage class, distinguishing the high-voltage bulk transmission corridors from lower-voltage feeders. With it you can see how regions interconnect, identify the major paths that move power across long distances, and reason about constraints, interties, and where new generation or load would need to tie in. The source is the Homeland Infrastructure Foundation-Level Data (HIFLD) electric power transmission lines layer.

Query contract: Preserve one canonical row per (event_time, hifld_id) before aggregating.
Analysis rules: Group only after preserving the declared grain: event_time, hifld_id.

Access

Plans: See available download and API access options. View pricing
Full history: Delivered to Snowflake, Databricks or your own storage on a schedule by Data services.
More coverage

Schema

22 columns

Column	Type
`event_time`	`DateTime64(6, 'UTC')`
`hifld_id`	`LowCardinality(String)`
`type`	`Nullable(String)`
`status`	`Nullable(String)`
`owner`

Loading…

Sample data

event_timeDateTime64(6, 'UTC')

hifld_idLowCardinality(String)

typeNullable(String)

statusNullable(String)

ownerNullable(String)

voltageNullable(Float64)

volt_classNullable(String)

inferredNullable(String)

sub_1Nullable(String)

sub_2Nullable(String)

naics_codeNullable(String)

naics_descNullable(String)

sourceNullable(String)

source_dateNullable(String)

val_methodNullable(String)

val_dateNullable(String)

shape_lengthNullable(Float64)

geometryNullable(String)

longitudeNullable(Float64)

latitudeNullable(Float64)

source_timeDateTime64(6, 'UTC')

ingested_atDateTime64(6, 'UTC')

2026-11-04 06:00:08.091202

313412

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

138

100-161

UNKNOWN306617

TAP311000

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY, DVOF

2019-03-01

IMAGERY/OTHER

2020-02-21

0.03862478947102392

{"type":"LineString","coordinates":[[-112.498445254,33.4671634900001],[-112.496233116,33.4668060110001],[-112.495945728,33.4646601860001],[-112.461727102,33.464813459]]}

-112.495945728

33.4646601860001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313411

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

-999999

NOT AVAILABLE

TAP310932

TAP310933

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-05-08

IMAGERY

2020-05-08

0.015629097383613202

{"type":"LineString","coordinates":[[-112.86007823,32.3816140910001],[-112.862525469,32.3753312060001],[-112.863303539,32.376340928],[-112.85874726,32.37024353]]}

-112.863303539

32.376340928

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313410

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

132

100-161

UNKNOWN308934

TAP310930

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-11-02

IMAGERY/OTHER

2020-05-08

0.10180631323205826

{"type":"LineString","coordinates":[[-113.12771155,33.52231175],[-113.127420335,33.522308391],[-113.127406875,33.521339234],[-113.12290294,33.5191891540001],[-113.110029354,33.5082938940001],[-113.031339695,33.5081549720001]]}

-113.12290294

33.5191891540001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313409

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

-999999

NOT AVAILABLE

DELANEY

TAP310929

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-11-02

IMAGERY/OTHER

2020-05-08

0.003221093628244746

{"type":"LineString","coordinates":[[-113.034328306,33.4811275320001],[-113.031404325,33.482478746]]}

-113.031404325

33.482478746

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313408

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

-999999

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-05-08

IMAGERY

2020-05-08

0.01951012992947963

{"type":"LineString","coordinates":[[-113.180833,33.3783330000001],[-113.180149656,33.3778363550001],[-113.162284707,33.377625134],[-113.162277901,33.377121532],[-113.162573423,33.3771232170001]]}

-113.162284707

33.377625134

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313407

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

-999999

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-05-08

IMAGERY

2020-05-08

0.011178321278387388

{"type":"LineString","coordinates":[[-112.864758327,32.370584122],[-112.859838,32.3686209900001],[-112.859476511,32.3696561610001],[-112.859032867,32.3701655310001],[-112.855069157,32.371248016]]}

-112.859476511

32.3696561610001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313406

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

-999999

NOT AVAILABLE

TAP310934

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-05-08

IMAGERY

2020-05-08

0.28352630963821446

{"type":"LineString","coordinates":[[-113.162284707,33.377625134],[-113.160330273,33.3776140750001],[-113.160175777,33.3627836530001],[-112.988058201,33.3627836530001],[-112.981621123,33.3485230480001],[-112.911506483,33.3482259530001],[-112.904040901,33.3434516360001]]}

-112.988058201

33.3627836530001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313405

AC; OVERHEAD

IN SERVICE

TXU POWER OR TXU ELECTRIC DELIVERY

138

100-161

TAP310986

TAP310987

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

http://www.newmexicocare.org/images/maps/nm_transmission_sys.jpg

2005-12-13

IMAGERY

2019-12-06

0.42133072510168446

{"type":"LineString","coordinates":[[-102.90366487,31.71292814],[-102.746209,31.8818660000001],[-102.733443,31.8963150000001],[-102.728419,31.9016060000001],[-102.71672,31.9153870000001],[-102.705018,31.9295490000001],[-102.67681,31.9634310000001],[-102.665528,31.976505],[-102.655873,31.987418],[-102.637422,32.006129],[-102.61290346,32.0117847770001]]}

-102.705018

31.9295490000001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313403

AC; OVERHEAD

IN SERVICE

WESTERN AREA POWER ADMINISTRATION

UNDER 100

KOF

UNKNOWN302152

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-01-08

IMAGERY

2020-01-08

0.5959659139580938

{"type":"LineString","coordinates":[[-114.347376495,32.867873504],[-114.348722696,32.8670965810001],[-114.354422447,32.85581452],[-114.351462961,32.8542095070001],[-114.337609369,32.8502952800001],[-113.989823987,32.8664525840001],[-113.960999262,32.863376427],[-113.897311432,32.871579511],[-113.793405704,32.9031385970001],[-113.797353864,32.9166259250001]]}

-113.989823987

32.8664525840001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313402

AC; OVERHEAD

IN SERVICE

WESTERN AREA POWER ADMINISTRATION

UNDER 100

KOF

UNKNOWN308372

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-01-08

IMAGERY

2020-01-08

0.15660202445885796

{"type":"LineString","coordinates":[[-114.347376495,32.867873504],[-114.365482425,32.862508403],[-114.372964294,32.868778492],[-114.393201504,32.9086563830001],[-114.424345755,32.9503508010001],[-114.425933014,32.9529297460001],[-114.43037291,32.957665681],[-114.438477385,32.9621030480001],[-114.449964305,32.9659208580001],[-114.450067274,32.9656067770001]]}

-114.425933014

32.9529297460001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313401

AC; OVERHEAD

IN SERVICE

ARIZONA POWER ELECTRIC SERVICE

UNDER 100

UNKNOWN308712

TAP310931

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-01-07

IMAGERY

2020-01-07

0.00387425459783903

{"type":"LineString","coordinates":[[-112.855069157,32.371248016],[-112.854900069,32.3751185790001]]}

-112.854900069

32.3751185790001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313400

AC; OVERHEAD

IN SERVICE

ARIZONA POWER ELECTRIC SERVICE

UNDER 100

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-01-07

IMAGERY

2020-01-07

0.024909262028405006

{"type":"LineString","coordinates":[[-112.830225674,32.369438959],[-112.855069157,32.371248016]]}

-112.855069157

32.371248016

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313399

AC; UNDERGROUND

IN SERVICE

ARIZONA POWER ELECTRIC SERVICE

UNDER 100

STAGECOACH

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

https://www.aps.com/-/media/APS/APSCOM-PDFs/About/Construction-and-Power-Line-Siting/Power-Line-Siting/Power-Line-Siting-Projects/Northeast-Valley/October2013ProjectUpdate.ashx?la=en&hash=3EB8A93C133C96C72872261819FECC97

2016-01-01

IMAGERY

2020-05-08

0.03483371069395928

{"type":"LineString","coordinates":[[-111.873202902,33.813342435],[-111.873221714,33.8139217450001],[-111.838967739,33.8138309500001]]}

-111.873221714

33.8139217450001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313398

AC; UNDERGROUND

INACTIVE

ARIZONA POWER ELECTRIC SERVICE

UNDER 100

STAGECOACH

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

https://www.aps.com/-/media/APS/APSCOM-PDFs/About/Construction-and-Power-Line-Siting/Power-Line-Siting/Power-Line-Siting-Projects/Northeast-Valley/NEValleyLineSitingUpdateMarch2016.ashx?la=en&hash=B5231EB23E7EA78A2BF1890DDBDF4DA3

2013-01-01

IMAGERY

2020-05-08

0.03397544370654584

{"type":"LineString","coordinates":[[-111.873202902,33.813342435],[-111.83922767,33.813462375]]}

-111.83922767

33.813462375

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313397

AC; OVERHEAD

IN SERVICE

ARIZONA PUBLIC SERVICE COMPANY

238

220-287

UNKNOWN301046

UNKNOWN308826

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2016-11-05

IMAGERY/OTHER

2020-02-21

0.10314498012852465

{"type":"LineString","coordinates":[[-112.676324115,33.144803263],[-112.676491061,33.1444202960001],[-112.674770842,33.136784203],[-112.672652036,33.130742459],[-112.666862031,33.112764075],[-112.665906209,33.0438360100001],[-112.66625537,33.0432585360001]]}

-112.672652036

33.130742459

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313396

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

138

100-161

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2016-05-03

IMAGERY/OTHER

2020-01-16

0.01769062813718592

{"type":"LineString","coordinates":[[-100.25324,35.198494],[-100.253241,35.2051440000001],[-100.253217,35.210807],[-100.253223,35.212883],[-100.253218,35.2135020000001],[-100.253194,35.2140210000001],[-100.253694,35.2147420000001],[-100.254184,35.2154630000001],[-100.254252216,35.2158711810001]]}

-100.253218

35.2135020000001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313395

AC; OVERHEAD

IN SERVICE

ARIZONA PUBLIC SERVICE COMPANY

138

100-161

UNKNOWN308826

GILA RIVER

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2016-11-05

IMAGERY/OTHER

2020-02-21

0.08259849423273301

{"type":"LineString","coordinates":[[-112.66625537,33.0432585360001],[-112.665811242,33.042785445],[-112.665953323,33.0008364380001],[-112.677984802,32.9843808270001],[-112.683541942,32.9757483760001],[-112.692890101,32.975871125]]}

-112.677984802

32.9843808270001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313394

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

UNDER 100

TAP310935

TAP310937

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2020-05-08

IMAGERY

2020-05-08

0.008097298238540988

{"type":"LineString","coordinates":[[-112.871376155,32.376068092],[-112.863475481,32.376418997],[-112.863303539,32.376340928]]}

-112.863475481

32.376418997

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313393

AC; OVERHEAD

IN SERVICE

NOT AVAILABLE

138

100-161

TAP310997

CULBERSON

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2019-11-26

IMAGERY

2019-11-26

0.42346635451346587

{"type":"LineString","coordinates":[[-104.304751,31.756811],[-104.322411,31.678551],[-104.34726,31.5673150000001],[-104.360822,31.4731390000001],[-104.375411,31.3771090000001],[-104.381176,31.3536310000001],[-104.393982,31.353615]]}

-104.360822

31.4731390000001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313392

AC; OVERHEAD

NOT AVAILABLE

-999999

NOT AVAILABLE

MOHAVE ELECTRIC

TAP310938

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-04-13

IMAGERY

2020-05-12

0.09033089649109617

{"type":"LineString","coordinates":[[-114.107558404,35.1999109810001],[-114.082706,35.189241],[-114.078235,35.187333],[-114.074183,35.185034],[-114.072967,35.184354],[-114.068974,35.1820530000001],[-114.067292,35.1811010000001],[-114.065595,35.1801540000001],[-114.061284,35.178503],[-114.059237,35.1765130000001],[-114.057561,35.1748230000001],[-114.056202,35.1736560000001],[-114.056191,35.1725640000001],[-114.056137,35.171122],[-114.054749,35.169434],[-114.050387,35.1668680000001],[-114.049156,35.1659680000001],[-114.045958,35.1636480000001],[-114.044877,35.1627950000001],[-114.03071,35.156239]]}

-114.057561

35.1748230000001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313391

AC; OVERHEAD

NOT AVAILABLE

-999999

NOT AVAILABLE

UNKNOWN310939

NOT AVAILABLE

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-04-13

IMAGERY

2020-05-12

0.006859597630354051

{"type":"LineString","coordinates":[[-114.070597,35.1325860000001],[-114.070461356,35.133136624],[-114.068908746,35.138458697],[-114.068355612,35.138963109]]}

-114.068908746

35.138458697

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313390

AC; OVERHEAD

NOT AVAILABLE

-999999

NOT AVAILABLE

TAP310947

UNKNOWN305924

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-04-13

IMAGERY

2020-05-13

0.13410948313602347

{"type":"LineString","coordinates":[[-114.184425,35.0922831280001],[-114.184696,35.092275],[-114.107478,35.142596],[-114.071131,35.1328090000001],[-114.06724,35.131762]]}

-114.107478

35.142596

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313389

AC; OVERHEAD

NOT AVAILABLE

-999999

NOT AVAILABLE

HILLTOP

UNKNOWN309636

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-04-13

IMAGERY

2020-05-13

0.08858511111859638

{"type":"LineString","coordinates":[[-114.059548427,35.1890535200001],[-114.059713172,35.188621052],[-114.060017,35.1873820000001],[-114.059976,35.1853100000001],[-114.057405,35.185283],[-114.04992,35.1854700000001],[-114.04904,35.185345],[-114.04011,35.1794370000001],[-114.024874,35.1840920000001],[-114.020177,35.1811490000001],[-113.982753,35.1811870000001],[-113.980249568,35.177788148]]}

-114.04904

35.185345

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313388

AC; OVERHEAD

NOT AVAILABLE

UNDER 100

UNKNOWN309636

TAP310990

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-04-13

IMAGERY

2020-05-12

0.030434227084924992

{"type":"LineString","coordinates":[[-114.059548427,35.1890535200001],[-114.059836,35.188584],[-114.061481,35.188069],[-114.062727,35.1886870000001],[-114.063551,35.1886680000001],[-114.063889,35.190145],[-114.066213,35.1903130000001],[-114.069117,35.190589],[-114.071605,35.192209],[-114.084948473,35.2014194340001]]}

-114.063889

35.190145

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

2026-11-04 06:00:08.091202

313387

AC; OVERHEAD

NOT AVAILABLE

-999999

NOT AVAILABLE

UNKNOWN307303

HILLTOP

221121

ELECTRIC BULK POWER TRANSMISSION AND CONTROL

IMAGERY

2018-05-24

IMAGERY

2020-05-11

0.0405637846705193

{"type":"LineString","coordinates":[[-113.980249568,35.177788148],[-113.982522,35.1812390000001],[-113.993396419,35.2160101320001]]}

-113.982522

35.1812390000001

2026-11-04 06:00:08.091202

2026-11-04 06:00:46.056860

25 rows

25 sample rows of 1.7MBrowse every row in Data

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Coverage

Complete: 14.4%
Gap days: 113
Days with data: 19

Show coverage history

Coverage: 14.4%Days with data: 19Gaps: 113

2026

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HIFLD SubstationsHIFLD · snapshot	A point-level inventory of electric substations across the United States, drawn from the Homeland Infrastructure Foundation-Level Data (HIFLD) program. Each record locates a substation and describes its name, city and county, voltage class (minimum and maximum kV), the number of transmission lines connecting to it, its type, and its operating status. Substations are the nodes where voltage is stepped up or down and where transmission and distribution meet, so this dataset lets operators, planners, traders, and researchers see where the grid's switching and transformation points sit, gauge the relative importance of a node by its voltage and line count, and tie generation and load to the network that connects them.
AESO Asset ListAESO · daily snapshot	AESO's registry of market assets: asset code, name, pool participant, operating status and asset type (source, sink and others), including retired assets.
Alberta (AESO) Price LocationsAESO · slow-moving dimension, refreshed every 6 hours	Every Alberta (AESO) location that carries a price, as three columns: location_id, name, and kind. 1 rows — system (1). This is the dimension the Alberta (AESO) price, and where applicable constraint, tables join to, and it is the one place a location's type is decided: resolve "which hubs exist", "is this a zone or a node", or "give me the readable name for this id" here rather than inferring a type from a name prefix. For Alberta, the one location_id is SYSTEM: the pool price (aeso.pool_price) and system marginal price (aeso.system_marginal_price) are system-wide and carry no location column. Alberta has no nodal, zonal or hub prices; do not look for one. Generating assets are identified by AESO asset code in aeso.unit_status and aeso.asset_list, not here. The same three columns exist for every market, so the equivalent question in another ISO is the same query against that ISO's table.