MARATHON
SubstationFlorida · FLORIDA POWER & LIGHT CO
MARATHON is an electric transmission substation in Florida, operated by FLORIDA POWER & LIGHT CO. It is classified as sub-transmission (138 kv) and connects 2 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 |
|---|---|---|---|---|
| #30351 | 138 kV | FLORIDA POWER & LIGHT CO | IN SERVICE | 18.4 mi |
| #47304 | 138 kV | FLORIDA POWER & LIGHT CO | IN SERVICE | 7.9 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MARATHON, 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 |
|---|---|---|---|---|---|---|---|
| ISLAMORADA | Substation-Adjacent | FL | Miami-Dade County | 138 kV | 100 MW | 3.6 yrs | 59.2 |
| MARATHON | Substation-Adjacent | FL | Monroe County | 138 kV | 100 MW | 3.6 yrs | 57.9 |
| UNKNOWN108501 | Substation-Adjacent | FL | Monroe County | 138 kV | 100 MW | 3.6 yrs | 57.3 |
| MARATHON GENERATING PLANT | Substation-Adjacent | FL | Monroe County | 138 kV | 100 MW | 3.6 yrs | 56.2 |
| Marathon Generating Plant | Brownfield | FL | Monroe | — | 14 MW | — | 54.9 |
| UNKNOWN120079 | Substation-Adjacent | FL | Monroe County | 138 kV | 100 MW | 3.6 yrs | 54.8 |
| Greenfield (TAP141792 - ISLAMORADA) | Greenfield | FL | Monroe County | 138 kV | 100 MW | 3.6 yrs | 53.4 |
| Greenfield (TAP141792 - ISLAMORADA) | Greenfield | FL | Monroe County | 138 kV | 100 MW | 3.6 yrs | 52.5 |
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
This page shows a public slice of the GridCensus dataset for MARATHON substation, Florida. Pro and Enterprise plans unlock the full 164,098-site catalog, raw sub-scores, parcel ownership, interconnection-queue detail, saved searches, and programmatic API access.