MCCARTHY
SubstationFlorida · FLORIDA POWER & LIGHT CO
At a glance
MCCARTHY is an electric transmission substation in Florida, on FLORIDA POWER & LIGHT CO's transmission network. It is classified as sub-transmission (138 kv) and connects 6 transmission lines. Substation proximity is one of the strongest speed-to-power signals for siting a datacenter — interconnection distance to an energized, high-voltage bus is often the binding constraint on time-to-energization.
Voltage & classification
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #100116 | 138 kV | FLORIDA POWER & LIGHT CO | IN SERVICE | 13.5 mi |
| #101074 | 138 kV | — | IN SERVICE | 3.6 mi |
| #125495 | 138 kV | — | IN SERVICE | 3.6 mi |
| #137391 | 138 kV | — | IN SERVICE | 10.6 mi |
| #111944 | — | FLORIDA POWER & LIGHT CO | IN SERVICE | 7.1 mi |
| #121878 | — | — | IN SERVICE | 7.3 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MCCARTHY, ranked by DC Readiness. Sites this close to an energized substation carry a strong speed-to-power advantage.
| Site | Type | State | County | Voltage | Capacity | Queue wait | Score |
|---|---|---|---|---|---|---|---|
| MARTIN | Substation-Adjacent | FL | Martin County | 500 kV | 1,000 MW | 3.7 yrs | 68.0 |
| TAP143095 | Substation-Adjacent | FL | Palm Beach County | 138 kV | 100 MW | 3.7 yrs | 57.5 |
| SOUTH BAY | Substation-Adjacent | FL | Palm Beach County | 138 kV | 100 MW | 3.7 yrs | 57.5 |
| EC Coal Martin County | Greenfield | FL | Martin County | — | — | 3.7 yrs | 57.3 |
| EC Near Martin | Greenfield | FL | Martin | — | — | 3.7 yrs | 57.3 |
| UNKNOWN150381 | Substation-Adjacent | FL | Palm Beach County | 138 kV | 100 MW | 3.7 yrs | 57.2 |
| HICPOCHEE | Substation-Adjacent | FL | Glades County | 138 kV | 100 MW | 3.7 yrs | 56.7 |
| OZ Palm Beach | Greenfield | FL | Palm Beach | — | — | 3.7 yrs | 56.7 |
How does MCCARTHY compare with other substations in Florida?
Florida has 2,533 substation records in HIFLD, of which 943 carry a station name; the rest are unnamed tap points, risers and line ends. 359 named substations in the state are in MCCARTHY's 115–229 kV band (38% of named stations). 269 sit in a higher band. 15 named substations in Florida operate at 345 kV or above. The highest voltage recorded in the state is 500 kV, and the state median is 138 kV.
Who owns the transmission lines at MCCARTHY?
The 6 connected lines listed above are owned by FLORIDA POWER & LIGHT CO. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 45.6 miles.
How do candidate sites near MCCARTHY score?
The 8 highest-scoring candidate sites within about 25 miles range from 57 to 68 on the 0–100 DC Readiness scale. They fall in Martin County, Palm Beach County, Martin, Glades County. The Florida average across 4,344 scored sites is 56. 1,539 of those Florida sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is MCCARTHY substation?
MCCARTHY has a maximum voltage of 138 kV. That places it in the 115–229 kV band. The median named US substation in this dataset is 115 kV, so MCCARTHY is above the national midpoint.
How many transmission lines connect to MCCARTHY substation?
6 transmission lines terminate at or pass through MCCARTHY in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 45.6 miles.
Who owns MCCARTHY substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at MCCARTHY belong to FLORIDA POWER & LIGHT CO. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is MCCARTHY substation located?
MCCARTHY is in Florida at 26.6900, -80.9433. The datacenter candidate sites closest to it are in Martin County, Palm Beach County, Martin.
Are there datacenter candidate sites near MCCARTHY substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of MCCARTHY. The highest-scoring is MARTIN at 68/100. Across Florida, the average DC Readiness score is 56.
Other 138 kV substations in Florida
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “MCCARTHY substation, Florida”, https://gridcensus.com/substations/florida/mccarthy-59a1c697 (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Substation attributes are derived from public HIFLD / EIA infrastructure data and may lag real-world upgrades or retirements. Voltage and connected-line counts are screening figures — confirm available capacity and interconnection terms directly with the operating utility and ISO.
Go deeper than the public screen
Every site and score for MCCARTHY substation, Florida is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.