MILLHOPPER
SubstationFlorida
At a glance
MILLHOPPER is an electric transmission substation in Florida. It is classified as sub-transmission (138 kv) and connects 4 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
Ownership
No owner is recorded for the lines that connect here.
Connected transmission lines
Lines terminating at or passing through this substation, by HIFLD line ID, highest voltage first.
| Line ID | Voltage | Owner | Status | Length |
|---|---|---|---|---|
| #100302 | 138 kV | — | IN SERVICE | 5.0 mi |
| #113101 | 138 kV | — | IN SERVICE | 4.9 mi |
| #135451 | 138 kV | — | IN SERVICE | 3.7 mi |
| #144775 | 138 kV | — | IN SERVICE | 3.7 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of MILLHOPPER, 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 |
|---|---|---|---|---|---|---|---|
| OZ Alachua | Greenfield | FL | Alachua | — | — | 3.7 yrs | 63.2 |
| NEWBERRY | Substation-Adjacent | FL | Gilchrist County | 230 kV | 300 MW | 3.7 yrs | 63.1 |
| UNKNOWN120457 | Substation-Adjacent | FL | Gilchrist County | 230 kV | 300 MW | 3.7 yrs | 62.9 |
| NEWBERRY | Substation-Adjacent | FL | Gilchrist County | 230 kV | 300 MW | 3.7 yrs | 62.9 |
| ARCHER | Substation-Adjacent | FL | Alachua County | 230 kV | 300 MW | 3.7 yrs | 62.7 |
| PARKER | Substation-Adjacent | FL | Alachua County | 230 kV | 300 MW | 3.7 yrs | 62.6 |
| EC Near John R Kelly | Greenfield | FL | Alachua | — | — | 3.7 yrs | 62.2 |
| EC Near John R Kelly | Greenfield | FL | Alachua | — | — | 3.7 yrs | 62.2 |
How does MILLHOPPER 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 MILLHOPPER'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.
How do candidate sites near MILLHOPPER score?
The 8 highest-scoring candidate sites within about 25 miles range from 62 to 63 on the 0–100 DC Readiness scale. They fall in Alachua, Gilchrist County, Alachua 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 MILLHOPPER substation?
MILLHOPPER 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 MILLHOPPER is above the national midpoint.
How many transmission lines connect to MILLHOPPER substation?
4 transmission lines terminate at or pass through MILLHOPPER in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 17.4 miles.
Where is MILLHOPPER substation located?
MILLHOPPER is in Florida at 29.7042, -82.3878. The datacenter candidate sites closest to it are in Alachua, Gilchrist County, Alachua County.
Are there datacenter candidate sites near MILLHOPPER substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of MILLHOPPER. The highest-scoring is OZ Alachua at 63/100. 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, “MILLHOPPER substation, Florida”, https://gridcensus.com/substations/florida/millhopper-531ef882 (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 MILLHOPPER 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.