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1064.7 MW Batteries (20 MW) + Natural Gas Fired Combustion Turbine (327 MW) + Natural Gas Steam Turbine (663 MW) + Petroleum Liquids (55 MW) operating in Marion, IN
1,064.7 MW
Nameplate Capacity
10
Generators
units
Hybrid (4)
Technology
Batteries + Natural Gas Fired Combustion Turbine + Natural Gas Steam Turbine + Petroleum Liquids
1958
Operating Since
Coordinates
39.7113, -86.1969
County
Marion, IN
Nearby Plants
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| Field | EIA | GEM | Wikidata |
|---|---|---|---|
| Operator | AES Indiana | AES Indiana | — |
| Owner(s) | AES Indiana | AES | — |
| Status | Operating | — | — |
The Harding Street Station is a 12-unit, 1,196 MW nameplate capacity, gas, coal, and oil-fired generating station located at 3700 S. Harding St., in Indianapolis, Indiana, U.S. It is owned by AES Indiana, a subsidiary of AES. Completed in 1973, Harding Street Station's tallest chimneys are 565 feet (172 m) in height.
Read more on WikipediaHarding Street is a 1064.7 MW hybrid power plant located in Marion County, Indiana. The plant, which began operating in 1958, is owned by AES and operated by AES Indiana. It utilizes a mix of technologies, including natural gas fired combustion turbines, natural gas steam turbines, petroleum liquids, and batteries. The plant has 10 generators and also includes a 20 MWh battery energy storage system (BESS) with a one-hour duration and lithium-ion battery (LIB) chemistry. Harding Street operates within the Midcontinent Independent Transmission System Operator, Inc. balancing authority and the ReliabilityFirst Corporation (RFC) NERC region.
The plant's primary fuel source is natural gas. In the most recent year with available data, Harding Street generated 3,425,680 MWh of electricity, achieving a capacity factor of 36.7%. Harding Street is the second-largest power plant in Indiana out of 20, and ranks 155th nationally out of 945 plants.
Generated from EIA, GEM, and public data sources
ISO/RTO
MISO
Market
ISO/RTO Member
NERC Region
RFC
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc.. (MISO)
Grid Voltage
138.0 kV
Regulatory Status
RE — Regulated
Entity Type
Investor-Owned Utility
Sector
Electric Utility
Monthly net generation as reported to EIA-923 — useful for historical context. Confidence varies sharply by fuel type; the band above and the “About this data” button explain the caveats specific to this plant and how InfraSure’s in-house model handles them.
339.6K MWh
Latest Month
3.4M MWh
Annual Generation
36.7%
Capacity Factor
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CO₂ Intensity
1287 lb/MWh
NOx
0.671 lb/MWh
SO₂
0.007 lb/MWh
CH₄
0.026 lb/MWh
N₂O
0.003 lb/MWh
Capacity Factor
31.1%
Annual Net Gen
2900 GWh
CO₂eq
1288 lb/MWh
Subregion
RFC West
2013
$965/kW
Est. Construction Cost
Total estimated cost: $1.0B
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Market Position
ISO/RTO Market
MISO
LMP Node
IPL.16STOU7O7
Pricing Hub
INDIANA.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
No wholesale contracts disclosed in FERC EQR for this plant.
FERC EQR captures bilateral wholesale energy + capacity contracts ≥$1M/yr filed quarterly by jurisdictional sellers — covers renewable PPAs, thermal energy sales agreements, capacity contracts, and tolling agreements alike. Many plants don't appear: regulated-utility output flows to ratepayers via cost-of-service rather than bilateral contracts; small projects fall below the filing threshold; tax-equity-financed renewables route offtake to investors not utilities; merchant plants sell into ISO clearing markets without bilateral contracts. News-extracted buyer facts (below) may surface contracts disclosed only through announcements.
Last updated 2026-03-26
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