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552.5 MW Natural Gas operating in Hot Spring, AR — Midcontinent Independent Transmission System Operator, Inc..
552.5 MW
Nameplate Capacity
1
Generators
unit
Natural Gas Steam Turbine
Technology
1970
Operating Since
Coordinates
34.4341, -92.9049
County
Hot Spring, AR
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Entergy Arkansas LLC | Entergy Arkansas | — |
| Owner(s) | Entergy Arkansas LLC | Entergy | — |
| Status | Operating | — | — |
Lake Catherine is a 552.5 MW natural gas-fired power plant located in Hot Spring County, Arkansas. The plant began operating in 1970 and has one generator utilizing natural gas steam turbine technology. It is owned by Entergy and operated by Entergy Arkansas LLC. Lake Catherine ranks as the 6th largest power plant in Arkansas out of 12, and 448th nationally out of 945 plants.
The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the SERC NERC region. In the latest year of reported generation data, Lake Catherine produced 299,600 MWh of electricity, resulting in a capacity factor of 6.1%. Financial data indicates an installed cost of $86.21 per kW, based on FERC filings.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
SERC — SERC Reliability Corporation
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
115.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
0 MWh
Latest Month
299.6K MWh
Annual Generation
6.1%
Capacity Factor
CO₂ Intensity
1308 lb/MWh
NOx
3 lb/MWh
SO₂
0.007 lb/MWh
CH₄
0.024 lb/MWh
N₂O
0.002 lb/MWh
Capacity Factor
3.5%
Annual Net Gen
169 GWh
CO₂eq
1309 lb/MWh
Subregion
SERC Mississippi Valley
Steam turbine · Entergy Arkansas, Inc. · Data from 2015–2024
$130/kW
Installed Cost
$2/kW
Annual CapEx
$88.7/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Market Position
ISO/RTO Market
MISO
LMP Node
EAI.LK_CATH4
Pricing Hub
ARKANSAS.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
Last updated 2026-04-09
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