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128 MW Natural Gas operating in Polk, IA — Midcontinent Independent Transmission System Operator, Inc..
128 MW
Nameplate Capacity
8
Generators
units
Natural Gas Fired Combustion Turbine
Technology
1966
Operating Since
Coordinates
41.5904, -93.6196
County
Polk, IA
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | MidAmerican Energy Co | MidAmerican Energy | — |
| Owner(s) | MidAmerican Energy Co | Berkshire Hathaway | — |
| Status | Operating | — | — |
River Hills is a 128 MW natural gas-fired power plant located in Polk County, Iowa. The plant, which began operating in 1966, consists of 8 natural gas-fired combustion turbine generators. It is owned by Berkshire Hathaway and operated by MidAmerican Energy Co. The plant's installed cost was $135.21 per kW, according to FERC data.
River Hills operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the MRO NERC region. In the most recent year of data, the plant generated 1,343 MWh of electricity, resulting in a capacity factor of 0.1%. River Hills is ranked as the 10th largest power plant out of 13 in Iowa, and 860th 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
Investor-Owned Utility
Sector
Electric Utility
109 MWh
Latest Month
1.3K MWh
Annual Generation
0.1%
Capacity Factor
CO₂ Intensity
2719 lb/MWh
Low-utilization plant — per-MWh rate is dominated by startup/standby emissions; not directly comparable to baseload averages.
NOx
7 lb/MWh
SO₂
0.075 lb/MWh
CH₄
0.051 lb/MWh
N₂O
0.005 lb/MWh
Capacity Factor
0.2%
Annual Net Gen
2 GWh
CO₂eq
2722 lb/MWh
Subregion
MRO West
Gas turbine · MidAmerican Energy Company · Data from 2015–2024
$146/kW
Installed Cost
$5/kW
Annual CapEx
$377.9/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Point of Interconnection
Nearest Substation
River Hills Gas Plant · 161 kV
Substation Distance
< 10 km
Operator
MidAmerican Energy
Coord Source
OSM spatial
Market Position
ISO/RTO Market
MISO
LMP Node
MEC.RHILLS14&58
Pricing Hub
MINN.HUB
Node Source
EIA-860 direct report
Last updated 2026-03-26
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