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56 MW Hydro operating in Garland, AR — Midcontinent Independent Transmission System Operator, Inc..
56 MW
Nameplate Capacity
2
Generators
units
Conventional Hydroelectric
Technology
1932
Operating Since
Coordinates
34.4425, -93.0262
County
Garland, AR
Nearby Plants
| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | Entergy Arkansas LLC | Entergy Arkansas | — |
| Owner(s) | Entergy Arkansas LLC | Entergy | — |
| Status | Operating | operating | — |
The Carpenter Hydroelectric Generating Station is located in Garland County, Arkansas. The plant, owned by Entergy and operated by Entergy Arkansas LLC, has a total capacity of 56 MW derived from two conventional hydroelectric generators. Carpenter went online in 1932 and is the 10th largest power plant in Arkansas out of 19, and the 282nd largest nationally out of 1464 plants.
In the most recent year of reporting, Carpenter generated 102,431 MWh of electricity, equating to a capacity factor of 20.9%. The plant operates within the Midcontinent Independent Transmission System Operator (MISO) balancing authority and the SERC NERC region. Financial data indicates an installed cost of $456.55 per kW.
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
6.3K MWh
Latest Month
102.4K MWh
Annual Generation
20.9%
Capacity Factor
Energy storage · Entergy Arkansas, Inc. · Data from 2015–2024
$484/kW
Installed Cost
$18.6/MWh
Operating Cost
Annual Capital & Operating Expenses
Cumulative Installed Cost
Per-Unit Cost Trends
Market Position
ISO/RTO Market
MISO
LMP Node
EAI.CARPEN1
Pricing Hub
ARKANSAS.HUB
Node Source
EIA-860 direct report
Last updated 2026-03-26
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