Electric Substations in Iowa
104 named substations in Iowa, 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 Iowa's substation network split by voltage?
By maximum voltage, the named substations break down as 30 at 345–499 kV; 55 at 115–229 kV; 9 at 69–114 kV; 10 withvoltage not recorded. 29% of Iowa'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 Iowa compare with other states?
Iowa ranks 35th of 50 states and DC by number of named substations and 17th by named substations at 345 kV or above. It also has 2,572 scored datacenter candidate sites with an average DC Readiness score of 56.3 (national average 53), and an average power sub-score of 36.7 against 37.4 nationally. Most of those sites (2,547) are in the MISO market.
Which substations in Iowa have the highest voltage?
| Substation | Max voltage | Connected lines | Line owner |
|---|---|---|---|
| ARNOLD | 345 kV | 7 | MIDAMERICAN ENERGY CO |
| BLACK HAWK | 345 kV | 6 | MIDAMERICAN ENERGY CO |
| BONDURANT | 345 kV | 6 | MIDAMERICAN ENERGY CO |
| BOONEVILLE | 345 kV | 6 | MIDAMERICAN ENERGY CO |
| GREATER DES MOINES ENERGY CENTER | 345 kV | 4 | MIDAMERICAN ENERGY CO |
| GRIMES | 345 kV | 7 | MIDAMERICAN ENERGY CO |
| HAZLETON | 345 kV | 8 | MIDAMERICAN ENERGY CO |
| HILLS | 345 kV | 9 | MIDAMERICAN ENERGY CO |
| KOSSUTH | 345 kV | 3 | MIDAMERICAN ENERGY CO |
| LEHIGH | 345 kV | 4 | MIDAMERICAN ENERGY CO |
| LOUISA | 345 kV | 4 | MIDAMERICAN ENERGY CO |
| MADISON COUNTY | 345 kV | 3 | MIDAMERICAN ENERGY CO |
| MONTEZUMA SWITCHING STATION | 345 kV | 3 | MIDAMERICAN ENERGY CO |
| NORWALK | 345 kV | 5 | MIDAMERICAN ENERGY CO |
| O'BRIEN | 345 kV | 3 | MIDAMERICAN ENERGY CO |
| OTTUMWA GENERATION STATION | 345 kV | 7 | MIDAMERICAN ENERGY CO |
| PIONEER PRAIRIE PHASE I | 345 kV | 5 | MIDAMERICAN ENERGY CO |
| RAUN | 345 kV | 13 | MIDAMERICAN ENERGY CO |
| ROCK CREEK | 345 kV | 4 | MIDAMERICAN ENERGY CO |
| ROLLING HILLS | 345 kV | 2 | MIDAMERICAN ENERGY CO |
| SALEM | 345 kV | 5 | MIDAMERICAN ENERGY CO |
| SE POLK | 345 kV | 6 | MIDAMERICAN ENERGY CO |
| SIOUX CITY | 345 kV | 5 | MIDAMERICAN ENERGY CO |
| SUB 91 | 345 kV | 4 | MIDAMERICAN ENERGY CO |
| SUB 92 | 345 kV | 3 | BOARD OF WATER ELECTRIC & COMMUNICATIONS |
| SUB T | 345 kV | 3 | MIDAMERICAN ENERGY CO |
| SYCAMORE | 345 kV | 10 | MIDAMERICAN ENERGY CO |
| TIFFIN | 345 kV | 3 | MIDAMERICAN ENERGY CO |
| WALTER SCOTT ENERGY CENTER | 345 kV | 7 | OMAHA PUBLIC POWER DISTRICT |
| WEBSTER | 345 kV | 6 | MIDAMERICAN ENERGY CO |
| ANITA | 161 kV | 3 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| ANKENY | 161 kV | 2 | MIDAMERICAN ENERGY CO |
| APPANOOSE | 161 kV | 4 | MIDAMERICAN ENERGY CO |
| ATLANTIC | 161 kV | 4 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| BERTRAM | 161 kV | 4 | MIDAMERICAN ENERGY CO |
| BOONE | 161 kV | 2 | — |
| BOONE JUNCTION | 161 kV | 4 | MIDAMERICAN ENERGY CO |
| BUTLER | 161 kV | 2 | ITC |
| CALAMUS | 161 kV | 4 | MIDAMERICAN ENERGY CO |
| COFFEY | 161 kV | 3 | MIDAMERICAN ENERGY CO |
| COGGON | 161 kV | 2 | MIDAMERICAN ENERGY CO |
| COLBY | 161 kV | 5 | ITC |
| CRESTON | 161 kV | 6 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| DENMARK | 161 kV | 5 | — |
| DES MOINES | 161 kV | 8 | MIDAMERICAN ENERGY CO |
| DEWITT | 161 kV | 2 | MIDAMERICAN ENERGY CO |
| DUNDEE | 161 kV | 3 | MIDAMERICAN ENERGY CO |
| DYSART | 161 kV | 2 | — |
| EARLHAM | 161 kV | 2 | MIDAMERICAN ENERGY CO |
| FORT DODGE | 161 kV | 3 | MIDAMERICAN ENERGY CO |
| GRAND JUNCTION | 161 kV | 4 | — |
| GUTHRIE CENTER | 161 kV | 2 | — |
| HENRY CO | 161 kV | 2 | — |
| HIAWATHA | 161 kV | 6 | MIDAMERICAN ENERGY CO |
| HICKORY CREEK | 161 kV | 4 | — |
| JASPER | 161 kV | 3 | MIDAMERICAN ENERGY CO |
| JEFFERSON | 161 kV | 5 | MIDAMERICAN ENERGY CO |
| KILLDEER | 161 kV | 2 | ITC |
| LIME CREEK | 161 kV | 6 | MIDAMERICAN ENERGY CO |
| LORE | 161 kV | 8 | — |
Every named substation in Iowa
All 104 named substations, grouped by voltage band.
345–499 kV · 30
- ARNOLD
- BLACK HAWK
- BONDURANT
- BOONEVILLE
- GREATER DES MOINES ENERGY CENTER
- GRIMES
- HAZLETON
- HILLS
- KOSSUTH
- LEHIGH
- LOUISA
- MADISON COUNTY
- MONTEZUMA SWITCHING STATION
- NORWALK
- O'BRIEN
- OTTUMWA GENERATION STATION
- PIONEER PRAIRIE PHASE I
- RAUN
- ROCK CREEK
- ROLLING HILLS
- SALEM
- SE POLK
- SIOUX CITY
- SUB 91
- SUB 92
- SUB T
- SYCAMORE
- TIFFIN
- WALTER SCOTT ENERGY CENTER
- WEBSTER
115–229 kV · 55
- ANITA
- ANKENY
- APPANOOSE
- ATLANTIC
- BERTRAM
- BOONE
- BOONE JUNCTION
- BUTLER
- CALAMUS
- COFFEY
- COGGON
- COLBY
- CRESTON
- DENMARK
- DES MOINES
- DEWITT
- DUNDEE
- DYSART
- EARLHAM
- FORT DODGE
- GRAND JUNCTION
- GUTHRIE CENTER
- HENRY CO
- HIAWATHA
- HICKORY CREEK
- JASPER
- JEFFERSON
- KILLDEER
- LIME CREEK
- LORE
- LUCAS CO
- LUNDQUIST
- MAQUOKETA
- MARSHALLTOWN
- MT VERNON
- NORTHEAST ANKENY
- PLYMOUTH
- REASNOR
- SCRANTON
- TRAER
- TURKEY RIVER
- VIELE
- VINTON
- WAPELLO
- WASHBURN
- WINTERSET JUNCTION
- WISDOM
- WYOMING
- BELLE PLAINE
- EAST CALAMUS
- MARION
- PRAIRE CREEK
- SUTLIFF
- TOLEDO
- WEST BRANCH
69–114 kV · 9
voltage not recorded · 10
Frequently asked questions
How many electric substations are in Iowa?
HIFLD records 1,368 substations in Iowa, of which 104 carry a station name. That is the 35th-most named substations of any state in the dataset.
What is the highest-voltage substation in Iowa?
30 named substations in Iowa share the top voltage of 345 kV, including ARNOLD, BLACK HAWK, BONDURANT.
Which substation in Iowa connects the most transmission lines?
RAUN has the most connected transmission lines of the named substations listed here, with 13 at up to 345 kV.
How many substations in Iowa are 345 kV or higher?
30 of 104 named substations (29%) operate at 345 kV or above, compared with 8% nationally. Iowa ranks 17th of 50 states and DC for named substations at that level.
How many datacenter candidate sites in Iowa are at substations?
761 of the 2,572 scored candidate sites in Iowa are substation sites — locations generated at an existing substation. Scored sites across Iowa average 56.3 on the 0–100 DC Readiness scale, against 53 nationally.
Looking for a specific record? The directory lists every substation in Iowa, A to Z.
More on Iowa, 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 Iowa”, https://gridcensus.com/substations/iowa (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 Iowa 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.