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118.7 MW Natural Gas Fired Combustion Turbine (62 MW) + Natural Gas Internal Combustion Engine (56 MW) operating in Union, IA — Midcontinent Independent Transmission System Operator, Inc..
118.7 MW
Nameplate Capacity
5
Generators
units
Hybrid (2)
Technology
Natural Gas Fired Combustion Turbine + Natural Gas Internal Combustion Engine
1973
Operating Since
Coordinates
41.1136, -94.3477
County
Union, IA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Central Iowa Power Cooperative | Central Iowa Power | — |
| Owner(s) | Central Iowa Power Cooperative | Central Iowa Power | — |
| Status | Operating | — | — |
Summit Lake is a 118.7 MW hybrid power plant located in Union County, Iowa. The plant, which began operating in 1973, is owned by Central Iowa Power and operated by Central Iowa Power Cooperative. It utilizes both natural gas-fired combustion turbine and natural gas internal combustion engine technologies across its five generators.
The plant's latest annual generation was 70,033 MWh, resulting in a capacity factor of 6.7%. Summit Lake operates within the Midcontinent Independent Transmission System Operator, Inc. (MISO) balancing authority and the MRO NERC region. It is ranked as the 12th largest power plant out of 13 in Iowa, and 891st out of 945 nationally.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
MRO — Midwest Reliability Organization
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
69.0 kV
Regulatory Status
RE — Regulated
Entity Type
Cooperative
Sector
Electric Utility
5.7K MWh
Latest Month
70.0K MWh
Annual Generation
6.7%
Capacity Factor
CO₂ Intensity
181 lb/MWh
NOx
1 lb/MWh
SO₂
0.001 lb/MWh
CH₄
0.021 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
6.9%
Annual Net Gen
72 GWh
CO₂eq
182 lb/MWh
Subregion
MRO West
2013
$965/kW
Est. Construction Cost
Total estimated cost: $114.6M
Market Position
ISO/RTO Market
MISO
LMP Node
ALTW.SLAK_CT2
Pricing Hub
MINN.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
Last updated 2026-03-26
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