interXdata

Iowa Interconnection Projects

interXdata tracks 1,239 interconnection projects in Iowa representing 126,828 MW of requested capacity. The dominant technology by capacity is Wind. The most active counties are Linn, Story, Marshall.

1,239Total projects
24Active
911Operational
295Withdrawn
126,828 MWRequested capacity
5,604 MWActive capacity

Technology mix

TechnologyProjectsRequested capacity
Wind44865,992 MW
Gas18521,127 MW
Other42017,314 MW
Solar11412,083 MW
Battery475,807 MW
Coal103,407 MW
Nuclear2706 MW
Gas+Other Storage1270 MW
Diesel1168 MW
Hydro155 MW

Counties

CountyProjectsRequested capacity
Linn576,890 MW
Story441,651 MW
Marshall395,923 MW
Adair385,847 MW
Polk351,754 MW
Cerro Gordo288,280 MW
Marion26155 MW
Lee261,025 MW
Franklin263,827 MW
Winnebago261,476 MW
Jackson25253 MW
Black Hawk241,214 MW
Johnson231,122 MW
Dubuque22607 MW
Bremer2284 MW
Poweshiek211,468 MW
Mitchell212,232 MW
Henry20436 MW
Tama191,866 MW
Muscatine191,295 MW
Palo Alto181,595 MW
Pocahontas184,176 MW
Worth181,870 MW
Hancock183,283 MW
Iowa18527 MW
Howard172,113 MW
Carroll16718 MW
Clinton163,591 MW
Cass16930 MW
Dickinson15608 MW
Kossuth15932 MW
Osceola15595 MW
Pottawattamie144,774 MW
Webster131,995 MW
Page13459 MW
Greene13939 MW
Adams13855 MW
Madison13689 MW
Boone121,152 MW
Taylor121,422 MW

Largest projects

ProjectQueue IDTechnologyCapacityStatusLocation
MISO Queue Project PQ0002 — Other in Cerro Gordo, IowaPQ0002Other2,000.0 MWwithdrawnCerro Gordo, Iowa
Paddtown II Wind 1500 MWT93Wind1,500.0 MWwithdrawnPocahontas, Iowa
Paddtown I Wind 1500 MWT92Wind1,500.0 MWwithdrawnPocahontas, Iowa
MISO Queue Project J116 — Wind in Hancock, IowaJ116Wind999.0 MWwithdrawnHancock, Iowa
MISO Queue Project E0025 — Gas in Linn, IowaE0025Gas986.9 MWwithdrawnLinn, Iowa
MISO Queue Project E0050 — Gas in Linn, IowaE0050Gas986.9 MWactiveLinn, Iowa
Walter Scott Jr Energy Center1082_4Other922.5 MWoperationalPottawattamie, Iowa
MISO Queue Project G718 — Coal in Wapello, IowaG718Coal900.0 MWwithdrawnWapello, Iowa
Louisa6664_1Other811.9 MWoperationalLouisa, Iowa
MISO Queue Project J355 — Gas in Adair, IowaJ355Gas810.0 MWwithdrawnAdair, Iowa
MISO Queue Project J363 — Gas in Pottawattamie, IowaJ363Gas810.0 MWwithdrawnPottawattamie, Iowa
MISO Queue Project E0010 — Gas in Marshall, IowaE0010Gas798.1 MWactiveMarshall, Iowa
MISO Queue Project E0049 — Gas in Cerro Gordo, IowaE0049Gas798.1 MWactiveCerro Gordo, Iowa
KilldeerJ4113Gas787.4 MWoperationalCerro Gordo, Iowa
MISO Queue Project G589 — Coal in Black Hawk, IowaG589Coal750.0 MWwithdrawnBlack Hawk, Iowa
Ottumwa6254_1Other725.9 MWoperationalWapello, Iowa
Walter Scott Jr Energy Center1082_3Other725.8 MWoperationalPottawattamie, Iowa
MISO Queue Project J233 — Gas in Marshall, IowaJ233Gas700.0 MWoperationalMarshall, Iowa
George Neal South7343_4Other695.9 MWoperationalWoodbury, Iowa
Linn County Generating FacilityE0009Nuclear675.5 MWwithdrawnLinn, Iowa
MISO Queue Project G220 — Other in Buchanan, IowaG220Other650.0 MWwithdrawnBuchanan, Iowa
MISO Queue Project G219 — Gas in Johnson, IowaG219Gas650.0 MWwithdrawnJohnson, Iowa
Duane Arnold 161 kVJ3932Other646.0 MWoperationalLinn, Iowa
MISO Queue Project G179 — Gas in Clinton, IowaG179Gas600.0 MWwithdrawnClinton, Iowa
MISO Queue Project G178 — Other in Clinton, IowaG178Other600.0 MWwithdrawnClinton, Iowa
MISO Queue Project G127 — Other in Des Moines, IowaG127Other600.0 MWwithdrawnDes Moines, Iowa
MISO Queue Project G128 — Other in Marshall, IowaG128Other600.0 MWwithdrawnMarshall, Iowa
MISO Queue Project G180 — Gas in Marshall, IowaG180Gas600.0 MWwithdrawnMarshall, Iowa
MISO Queue Project G187 — Other in Muscatine, IowaG187Other600.0 MWwithdrawnMuscatine, Iowa
MISO Queue Project G720 — Coal in Marshall, IowaG720Coal600.0 MWwithdrawnMarshall, Iowa

Top developers in Iowa

Developer (canonical)ProjectsCapacity
Interstate Power and Light Co53,930 MW
City of Laurens, IA17 MW
Highland Wind Energy L1150 MW
MidAmerican Energy Company1265 MW
City of Manning, IA16 MW
Nextera1676 MW

Recent material changes

ObservedProjectFieldOldNew
2026-10-02Rock Creek Solarproposed_online_date2026-12-012026-10-01
2026-09-24HASTINGSphaseStudy Not StartedPhase 2
2026-09-24ADAMSphaseStudy Not StartedPhase 2
2026-09-24Salem 161kvphaseStudy Not StartedPhase 2
2026-09-24HazletonphaseStudy Not StartedPhase 2
2026-09-24IRVINGTON - WEBSTER 345.0kVphaseStudy Not StartedPhase 2
2026-09-24PostvillephaseStudy Not StartedPhase 2
2026-09-24LITTLE SIOUX - LEMARS TAP 161.0kVphaseStudy Not StartedPhase 2
2026-09-24Other_phaseStudy Not StartedPhase 2
2026-09-24Other_phaseStudy Not StartedPhase 2
2026-09-247MAYWOOD - 7SUB T 3 345.0kVphaseStudy Not StartedPhase 2
2026-09-24FLOYD - EMERY (ITCM) 161.0kVphaseStudy Not StartedPhase 2

Explore related data

Source last checked2026-07-31
Data last materially changed2026-10-11
Page data generated2026-10-11

Provenance: aeci-oasis; U.S. EIA — Form EIA-860M generator inventory (operating + planned); Lawrence Berkeley National Laboratory — Queued Up interconnection dataset; MISO — generator interconnection queue; PJM — new-services interconnection queue; Southwest Power Pool — generator interconnection queue. Values are normalized from public source records into the interXdata canonical warehouse; see each source for original filings.

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