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Power Grid Proximity Screener - Transmission Lines Near Sites

Electric substation proximity API: for each site (lat/lon), get distance to the nearest substation, transmission line (kV, owner), and power plant, plus density counts and a HIGH/MEDIUM/LOW grid-access tier. Keyless HIFLD data. For data-center, renewable and BESS siting.

Pricing

from $5.50 / 1,000 results

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Developer

Kyle Maloney

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Asset label

asset_label

Optional

Label of the screened site (as provided, or 'lat,lon').

Type:string

Example:Denver site

Asset latitude

asset_lat

Optional

Latitude of the screened site (WGS84).

Type:number | null

Example:39.7392

Asset longitude

asset_lon

Optional

Longitude of the screened site (WGS84).

Type:number | null

Example:-104.9903

Nearest line distance (mi)

nearest_line_distance_miles

Optional

Distance in miles from the site to the nearest existing (energized) transmission line within the radius; excludes under-construction/proposed/retired lines. null if none.

Type:number | null

Example:0.42

Nearest line voltage (kV)

nearest_line_voltage_kv

Optional

Voltage of the nearest existing line in kV; null when HIFLD does not report it.

Type:number | null

Example:115

Nearest line voltage class

nearest_line_volt_class

Optional

HIFLD voltage class of the nearest in-service line (e.g. '100-161', '345', 'UNDER 100').

Type:string | null

Example:100-161

Nearest line owner

nearest_line_owner

Optional

Utility that owns the nearest in-service line.

Type:string | null

Example:MIDWEST ENERGY INC

Nearest line status

nearest_line_status

Optional

Raw HIFLD STATUS of the nearest line. Note: HIFLD leaves most existing energized lines as 'NOT AVAILABLE' rather than 'IN SERVICE', so 'NOT AVAILABLE' here means status-unspecified, not out of service.

Type:string | null

Example:NOT AVAILABLE

Lines within radius

lines_within_radius

Optional

Count of transmission lines (any status, after the optional minVoltageKv filter) within the search radius.

Type:integer | null

Example:12

Lines under construction within radius

lines_under_construction_within_radius

Optional

Count of transmission lines within the radius whose HIFLD STATUS indicates under construction (vs already in service).

Type:integer | null

Example:1

Max line voltage within radius (kV)

max_voltage_within_radius_kv

Optional

Highest reported line voltage within the radius, in kV; null when no line reports voltage.

Type:number | null

Example:345

Nearest substation name

nearest_substation_name

Optional

Name of the nearest electric substation within the radius; null if none or the layer was skipped.

Type:string | null

Example:COORS

Nearest substation distance (km)

nearest_substation_distance_km

Optional

Distance in kilometres from the site to the nearest electric substation within the radius; null if none.

Type:number | null

Example:1.83

Nearest substation max voltage (kV)

nearest_substation_max_voltage

Optional

Maximum voltage of the nearest substation in kV; null when HIFLD does not report it.

Type:number | null

Example:230

Substations within radius

substations_within_radius

Optional

Count of electric substations within the search radius; null when the substation layer was skipped or unavailable.

Type:integer | null

Example:4

Nearest power plant name

nearest_power_plant_name

Optional

Name of the nearest power plant within the radius; null if none or the layer was skipped.

Type:string | null

Example:CHEROKEE

Nearest power plant distance (km)

nearest_power_plant_distance_km

Optional

Distance in kilometres from the site to the nearest power plant within the radius; null if none.

Type:number | null

Example:3.12

Nearest power plant fuel

nearest_power_plant_fuel

Optional

Primary fuel of the nearest power plant (e.g. 'NG', 'SUN', 'WND', 'COL'); null when unavailable.

Type:string | null

Example:NG

Nearest power plant type

nearest_power_plant_type

Optional

NAICS generation type of the nearest power plant (e.g. 'FOSSIL FUEL ELECTRIC POWER GENERATION', 'SOLAR ELECTRIC POWER GENERATION').

Type:string | null

Example:FOSSIL FUEL ELECTRIC POWER GENERATION

Nearest power plant capacity (MW)

nearest_power_plant_capacity_mw

Optional

Operating capacity of the nearest power plant in MW; null when HIFLD does not report it.

Type:number | null

Example:717

Power plants within radius

power_plants_within_radius

Optional

Count of power plants within the search radius; null when the power-plant layer was skipped or unavailable.

Type:integer | null

Example:2

Planned line nearby (non-authoritative)

planned_line_nearby

Optional

Low-confidence hint: true when a geometry from HIFLD's non-authoritative planned-line scratch layer falls within the radius. NOT authoritative planned-line data. null when the check was disabled or failed.

Type:boolean | null

Example:false

Grid access tier

grid_tier

Optional

Editorial tier over existing (energized) lines, excluding under-construction/proposed/retired: HIGH (>=230 kV within 2 mi), MEDIUM (>=115 kV within 2 mi or >=230 kV within 5 mi), LOW (any existing line within radius), NONE, or ERROR.

Type:string

Example:HIGH

Error

error

Optional

Error message for ERROR rows (bad coordinates or upstream lines-layer failure); null on success.

Type:string | null

Example:null

Checked at

checked_at

Optional

ISO 8601 UTC timestamp of the screening run.

Type:string

Example:2026-07-17T18:00:00.000Z

Source URL

source_url

Optional

HIFLD Open ArcGIS layer the transmission-line data came from.

Type:string

Example:https://services1.arcgis.com/Hp6G80Pky0om7QvQ/arcgis/rest/services/Electric_Power_Transmission_Lines/FeatureServer/0

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