ROBINSON MARATHON
SubstationIllinois · AMEREN ILLINOIS COMPANY
At a glance
ROBINSON MARATHON is an electric transmission substation in Illinois, on AMEREN ILLINOIS COMPANY's transmission network. 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 |
|---|---|---|---|---|
| #171102 | 138 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 1.7 mi |
| #171103 | 138 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 0.8 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of ROBINSON 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 |
|---|---|---|---|---|---|---|---|
| UNKNOWN124618 | Substation-Adjacent | IN | Vigo County | 345 kV | 600 MW | 3.0 yrs | 67.3 |
| SULLIVAN | Substation-Adjacent | IN | Sullivan County | 765 kV | 1,000 MW | 3.0 yrs | 65.0 |
| BREED | Substation-Adjacent | IN | Sullivan County | 345 kV | 600 MW | 3.0 yrs | 62.5 |
| MEROM STATION | Substation-Adjacent | IN | Sullivan County | 345 kV | 600 MW | 3.0 yrs | 62.5 |
| CASEY WEST | Substation-Adjacent | IL | Cumberland County | 345 kV | 600 MW | 4.8 yrs | 61.9 |
| EC Coal Sullivan County | Greenfield | IN | Sullivan County | — | — | 3.0 yrs | 59.1 |
| EC FFE Richland County | Greenfield | IL | Richland County | — | — | 4.8 yrs | 59.0 |
| EC Coal Crawford County | Greenfield | IL | Crawford County | — | — | 4.8 yrs | 58.9 |
How does ROBINSON MARATHON compare with other substations in Illinois?
Illinois has 1,986 substation records in HIFLD, of which 209 carry a station name; the rest are unnamed tap points, risers and line ends. 90 named substations in the state are in ROBINSON MARATHON's 115–229 kV band (43% of named stations). 95 sit in a higher band. 92 named substations in Illinois operate at 345 kV or above. The highest voltage recorded in the state is 765 kV, and the state median is 161 kV.
Who owns the transmission lines at ROBINSON MARATHON?
The 2 connected lines listed above are owned by AMEREN ILLINOIS COMPANY. Line voltages range from 138 kV to 138 kV. Their combined recorded length is about 2.5 miles.
How do candidate sites near ROBINSON MARATHON score?
The 8 highest-scoring candidate sites within about 25 miles range from 59 to 67 on the 0–100 DC Readiness scale. They fall in Vigo County, Sullivan County, Cumberland County, Richland County. The Illinois average across 3,641 scored sites is 54.3. 795 of those Illinois sites are classed as substation sites (candidate locations generated at an existing substation).
Frequently asked questions
What voltage is ROBINSON MARATHON substation?
ROBINSON MARATHON 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 ROBINSON MARATHON is above the national midpoint.
How many transmission lines connect to ROBINSON MARATHON substation?
2 transmission lines terminate at or pass through ROBINSON MARATHON in the HIFLD line data. The connected lines listed here run at 138 kV. Together the listed lines cover about 2.5 miles.
Who owns ROBINSON MARATHON substation?
HIFLD does not publish substation owners directly. Most of the transmission lines that end at ROBINSON MARATHON belong to AMEREN ILLINOIS COMPANY. GridCensus derives this from the line data, so confirm ownership with the utility for anything contractual.
Where is ROBINSON MARATHON substation located?
ROBINSON MARATHON is in Illinois at 39.0020, -87.7251. The datacenter candidate sites closest to it are in Vigo County, Sullivan County, Cumberland County.
Are there datacenter candidate sites near ROBINSON MARATHON substation?
GridCensus lists at least 8 scored candidate sites within roughly 25 miles of ROBINSON MARATHON. The highest-scoring is UNKNOWN124618 at 67/100. Across Illinois, the average DC Readiness score is 54.3.
Other 138 kV substations in Illinois
- EDWARDS· 15 lines
- EAST KEWANEE· 14 lines
- SKOKIE (138 KV)· 12 lines
- FARGO· 9 lines
- HAYFORD· 8 lines
- MUDDY· 8 lines
- NORTH DECATUR· 8 lines
- GRAND TOWER· 7 lines
- All named substations in Illinois· 209 stations
- Datacenter candidate sites in Illinois· 3,641 sites
- Brownfield and retired plant sites in Illinois
- Substations by state
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, “ROBINSON MARATHON substation, Illinois”, https://gridcensus.com/substations/illinois/robinson-marathon-5f7a40d4 (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 ROBINSON MARATHON substation, Illinois 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.