COFFEEN
SubstationIllinois · AMEREN ILLINOIS COMPANY
COFFEEN is an electric transmission substation in Illinois, operated by AMEREN ILLINOIS COMPANY. It is classified as high-voltage (345 kv) and connects 5 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 |
|---|---|---|---|---|
| #6985 | 345 kV | — | IN SERVICE | 0.3 mi |
| #14575 | 345 kV | — | IN SERVICE | 29.5 mi |
| #24627 | 345 kV | — | IN SERVICE | 0.3 mi |
| #44401 | 345 kV | AMEREN ILLINOIS COMPANY | IN SERVICE | 50.4 mi |
| #65075 | 345 kV | — | — | 0.1 mi |
Nearby datacenter candidate sites
Scored candidate sites within roughly 25 miles of COFFEEN, 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 |
|---|---|---|---|---|---|---|---|
| JARVIS | Substation-Adjacent | IL | Madison County | 345 kV | 600 MW | 4.6 yrs | 72.7 |
| UNKNOWN121701 | Substation-Adjacent | IL | Madison County | 138 kV | 100 MW | 4.6 yrs | 69.4 |
| IMEA HIGHLAND | Substation-Adjacent | IL | Madison County | 138 kV | 100 MW | 4.6 yrs | 68.1 |
| COFFEEN | Substation-Adjacent | IL | Bond County | 345 kV | 600 MW | 4.6 yrs | 67.1 |
| Coffeen | Brownfield | IL | Bond County | — | 1,005 MW | 4.6 yrs | 67.0 |
| Greenfield (ROXFORD - COFFEEN) | Greenfield | IL | Madison County | 345 kV | 600 MW | 4.6 yrs | 66.3 |
| UNKNOWN173728 | Substation-Adjacent | IL | Madison County | 138 kV | 100 MW | 4.6 yrs | 65.8 |
| GREENVILLE | Substation-Adjacent | IL | Bond County | 138 kV | 100 MW | 4.6 yrs | 65.4 |
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 COFFEEN substation, Illinois. 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.