Electric Substations in Illinois
209 named substations in Illinois, with the highest-voltage facilities listed first. Each substation profile shows voltage class, connected transmission lines, and the datacenter candidate sites closest to it.
At a glance
How is Illinois's substation network split by voltage?
By maximum voltage, the named substations break down as 3 at 500 kV and above; 89 at 345–499 kV; 3 at 230–344 kV; 90 at 115–229 kV; 11 at 69–114 kV; 13 withvoltage not recorded. 44% of Illinois's named substations operate at 345 kV or above, against 8% across all 16,654 named US substations. The state median of 161 kV is above the national median of 115 kV.
How does Illinois compare with other states?
Illinois ranks 21st of 50 states and DC by number of named substations and 2nd by named substations at 345 kV or above. It also has 3,641 scored datacenter candidate sites with an average DC Readiness score of 53.6 (national average 53), and an average power sub-score of 36.9 against 37.4 nationally. Most of those sites (1,902) are in the MISO market.
Which substations in Illinois have the highest voltage?
| Substation | Max voltage | Connected lines | Line owner |
|---|---|---|---|
| COLLINS | 765 kV | 3 | COMMONWEALTH EDISON CO |
| PLANO (765 KV) | 765 kV | 3 | AMEREN ILLINOIS COMPANY |
| WILTON | 765 kV | 3 | COMED |
| AUSTIN | 345 kV | 8 | AMEREN ILLINOIS COMPANY |
| BALDWIN STATION | 345 kV | 8 | AMEREN ILLINOIS COMPANY |
| BEDFORD PARK | 345 kV | 11 | COMMONWEALTH EDISON CO |
| BLUE ISLAND | 345 kV | 9 | COMMONWEALTH EDISON CO |
| BLUE MOUND | 345 kV | 3 | AMEREN ILLINOIS COMPANY |
| BOLLINGBROOK | 345 kV | 2 | — |
| BRAIDWOOD | 345 kV | 7 | COMMONWEALTH EDISON CO |
| BROKAW | 345 kV | 10 | AMEREN ILLINOIS COMPANY |
| BUNSENVILLE | 345 kV | 2 | AMEREN ILLINOIS COMPANY |
| BURNHAM | 345 kV | 14 | COMMONWEALTH EDISON CO |
| BYRON | 345 kV | 6 | COMMONWEALTH EDISON CO |
| CAHOKIA | 345 kV | 19 | AMEREN ILLINOIS COMPANY |
| CASEY WEST | 345 kV | 4 | AMEREN ILLINOIS COMPANY |
| CHERRY VALLEY | 345 kV | 12 | COMMONWEALTH EDISON CO |
| CLINTON STATION | 345 kV | 5 | AMEREN ILLINOIS COMPANY |
| COFFEEN | 345 kV | 5 | AMEREN ILLINOIS COMPANY |
| COFFEEN N | 345 kV | 4 | AMEREN ILLINOIS COMPANY |
| COLLINS | 345 kV | 3 | COMMONWEALTH EDISON CO |
| COMMONWEALTH EDISON DES PLAINES (345KV) | 345 kV | 12 | COMMONWEALTH EDISON CO |
| DAVIS CREEK | 345 kV | 10 | COMMONWEALTH EDISON CO |
| DRESDEN STATION | 345 kV | 10 | COMMONWEALTH EDISON CO |
| EAST FRANKFORT | 345 kV | 12 | — |
| EASY ROAD | 345 kV | 4 | — |
| ELECTRIC LIGHT 345 KV | 345 kV | 16 | COMMONWEALTH EDISON CO |
| ELMHURST | 345 kV | 12 | COMMONWEALTH EDISON CO |
| ELWOOD | 345 kV | 5 | COMMONWEALTH EDISON CO |
| FARADAY | 345 kV | 4 | AMEREN ILLINOIS COMPANY |
| FARGO 345 KV | 345 kV | 3 | AMEREN ILLINOIS COMPANY |
| GOLF MILL | 345 kV | 8 | COMMONWEALTH EDISON CO |
| GOODINGS GROVE | 345 kV | 20 | COMMONWEALTH EDISON CO |
| GOOSE CREEK | 345 kV | 3 | AMEREN ILLINOIS COMPANY |
| HERLEMAN | 345 kV | 6 | AMEREN ILLINOIS COMPANY |
| HOLLAND STATION | 345 kV | 3 | AMEREN ILLINOIS COMPANY |
| ITASCA | 345 kV | 8 | COMMONWEALTH EDISON CO |
| JOLIET | 345 kV | 9 | — |
| JOPPA 345 | 345 kV | 5 | AMEREN ILLINOIS COMPANY |
| KANSAS WEST | 345 kV | 7 | AMEREN ILLINOIS COMPANY |
| KINCAID STATION | 345 kV | 5 | AMEREN ILLINOIS COMPANY |
| LA SALLE | 345 kV | 7 | AMEREN ILLINOIS COMPANY |
| LANESVILLE | 345 kV | 4 | AMEREN ILLINOIS COMPANY |
| LANSING | 345 kV | 4 | COMMONWEALTH EDISON CO |
| LATHAM | 345 kV | 6 | AMEREN ILLINOIS COMPANY |
| LIBERTYVILLE | 345 kV | 10 | COMMONWEALTH EDISON CO |
| LINCOLN | 345 kV | 2 | COMED |
| LISLE | 345 kV | 4 | — |
| LOCKPORT | 345 kV | 12 | COMMONWEALTH EDISON CO |
| LOMBARD | 345 kV | 13 | COMMONWEALTH EDISON CO |
| MAPLE RIDGE | 345 kV | 3 | AMEREN |
| MEREDOSIA | 345 kV | 8 | AMEREN ILLINOIS COMPANY |
| NELSON | 345 kV | 10 | COMMONWEALTH EDISON CO |
| NEOGA | 345 kV | 8 | AMEREN ILLINOIS COMPANY |
| NEWTON STATION | 345 kV | 6 | AMEREN ILLINOIS COMPANY |
| NORRIS CITY NORTH | 345 kV | 6 | AMEREN ILLINOIS COMPANY |
| NORTHBROOK | 345 kV | 4 | COMMONWEALTH EDISON CO |
| OAK GROVE | 345 kV | 6 | MIDAMERICAN ENERGY CO |
| OREANA | 345 kV | 7 | AMEREN ILLINOIS COMPANY |
| PANA | 345 kV | 9 | AMEREN ILLINOIS COMPANY |
Every named substation in Illinois
All 209 named substations, grouped by voltage band.
500 kV and above · 3
345–499 kV · 89
- AUSTIN
- BALDWIN STATION
- BEDFORD PARK
- BLUE ISLAND
- BLUE MOUND
- BOLLINGBROOK
- BRAIDWOOD
- BROKAW
- BUNSENVILLE
- BURNHAM
- BYRON
- CAHOKIA
- CASEY WEST
- CHERRY VALLEY
- CLINTON STATION
- COFFEEN
- COFFEEN N
- COLLINS
- COMMONWEALTH EDISON DES PLAINES (345KV)
- DAVIS CREEK
- DRESDEN STATION
- EAST FRANKFORT
- EASY ROAD
- ELECTRIC LIGHT 345 KV
- ELMHURST
- ELWOOD
- FARADAY
- FARGO 345 KV
- GOLF MILL
- GOODINGS GROVE
- GOOSE CREEK
- HERLEMAN
- HOLLAND STATION
- ITASCA
- JOLIET
- JOPPA 345
- KANSAS WEST
- KINCAID STATION
- LA SALLE
- LANESVILLE
- LANSING
- LATHAM
- LIBERTYVILLE
- LINCOLN
- LISLE
- LOCKPORT
- LOMBARD
- MAPLE RIDGE
- MEREDOSIA
- NELSON
- NEOGA
- NEWTON STATION
- NORRIS CITY NORTH
- NORTHBROOK
- OAK GROVE
- OREANA
- PANA
- PAWNEE
- PLANO (345 KV)
- PLEASANT VALLEY
- PONTIAC MIDPOINT
- POWERTON STATION
- PRAIRIE STATE STATION
- PROSPECT HEIGHTS
- QUAD CITIES
- RACCOON CREEK STATION
- RAMSEY
- RISING
- ROXFORD
- SANDBURG
- SIDNEY
- SILVER LAKE
- SKOKIE (345 KV)
- SOUTH BLOOMINGTON
- STALLINGS
- STERLING STEEL
- SUB 39
- TAZEWELL
- TOLLWAY
- TOP CROP
- TURKEY HILL
- WAYNE
- WEMPLETOWN
- WEST FRANKFORT EAST
- WEST MOUNT VERNON
- WILTON (345KV)
- WOLFS CROSSING
- ZION
- ZION ENERGY CENTER
230–344 kV · 3
115–229 kV · 90
- JOPPA STATION
- MARBLEHEAD NORTH
- MARION S
- MERCER
- ALSIP
- ARLINGTON HEIGHTS
- ASHLEY
- BELLWOOD
- BERKELEY
- CARBONDALE NW
- CATERPILLAR
- CENTRALIA
- CHESTERVILLE
- COMED 138KV DEVON
- COMMONWEALTH EDISON DES PLAINES (138KV)
- CRAB ORCHARD
- CRESTWOOD
- CWLP
- DECATUR ADM NORTH
- DECATUR EAST MAIN STREET
- DECATUR NORTH 27TH STREET
- DECATUR ROUTE 51
- E BELLEVILLE
- EAST GALESBURG
- EAST KEWANEE
- EAST QUINCY
- EASY SPRINGFIELD
- EDWARDS
- EVERGREEN PARK
- FARGO
- FOGARTY
- FRANKLIN PARK
- FRONTENAC
- GALESBURG MONMOUTH BOULEVARD
- GRAND TOWER
- GREENVILLE
- HAVANA
- HAVANA S
- HAYFORD
- HEGEWISCH
- HENNEPIN
- HERRIN
- HOOKDALE
- HUTSONVILLE
- INA
- LAWRENCEVILLE SOUTH
- MAKANDA
- MARION N
- MASON CITY WEST
- MATTESON
- MATTOON EAST
- MATTOON WEST
- MCLEAN WIND FARM STEP-UP TRANSFORMER
- MEADOWS
- MIDWAY
- MONTGOMERY
- MOWEAQUA
- MUDDY
- MURDOCK
- NASHVILLE
- NILES
- NORTH DECATUR
- NORTH STAUNTON
- OAK BROOK
- OKAWVILLE
- OSWEGO
- PANA NORTH
- PLANO (138 KV)
- PLEASANT HILL
- PORTER RD
- REEDS
- ROBINSON MARATHON
- ROODHOUSE WEST
- ROUTE 59
- ROYCE
- S BELLEVILLE
- SHELBYVILLE SOUTH
- SKOKIE (138 KV)
- SOUTH HOLLAND
- SPRING BROOK
- STEELEVILLE
- TAYLORVILLE SOUTH
- TINLEY PARK
- TOWER AUTOMOTIVE
- TUSCOLA NE
- TUSCOLA W
- TWIN GROVE - APOLLO ACHARES
- URBANA PERKINS ROAD SUBSTATION
- WARRENVILLE
- WILDWOOD
69–114 kV · 11
Frequently asked questions
How many electric substations are in Illinois?
HIFLD records 1,986 substations in Illinois, of which 209 carry a station name. That is the 21st-most named substations of any state in the dataset.
What is the highest-voltage substation in Illinois?
3 named substations in Illinois share the top voltage of 765 kV, including COLLINS, PLANO (765 KV), WILTON.
Which substation in Illinois connects the most transmission lines?
GOODINGS GROVE has the most connected transmission lines of the named substations listed here, with 20 at up to 345 kV.
How many substations in Illinois are 345 kV or higher?
92 of 209 named substations (44%) operate at 345 kV or above, compared with 8% nationally. Illinois ranks 2nd of 50 states and DC for named substations at that level.
How many datacenter candidate sites in Illinois are at substations?
795 of the 3,641 scored candidate sites in Illinois are substation sites — locations generated at an existing substation. Scored sites across Illinois average 53.6 on the 0–100 DC Readiness scale, against 53 nationally.
Looking for a specific record? The directory lists every substation in Illinois, A to Z.
More on Illinois, and states with similar counts
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, “Electric substations in Illinois”, https://gridcensus.com/substations/illinois (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for substations in 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.