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 — Midcontinent Independent Transmission System Operator, Inc..
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
| 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
NERC Region
RFC
Balancing Authority
Midcontinent Independent Transmission System Operator, Inc..
Grid Voltage
138 kV
Regulatory Status
RE
Entity Type
Investor-Owned Utility
Sector
Electric Utility
339.6K MWh
Latest Month
3.4M MWh
Annual Generation
36.7%
Capacity Factor
No financial data available for this plant.
Market Position
ISO/RTO Market
MISO
LMP Node
IPL.16STOU7O7
Pricing Hub
INDIANA.HUB
Location Type
Generation Node
Node Source
EIA-860 direct report
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After decades of pollution and elevated arsenic, will Indy’s toxic coal ash ponds be cleaned?
AES Indiana is taking steps to clean and control the coal ash ponds at its Harding Street Station site.
After decades of pollution and elevated arsenic, will Indy's toxic coal ash ponds be cleaned?
AES Indiana is taking steps to clean and control the coal ash ponds at its Harding Street Station site.
AES Indiana seeks public input on coal ash contamination corrective measures at Harding Street Station
Groundwater monitoring results of the Harding Street Station's Ash Pond System found levels of arsenic, lithium and molybdenum above...
Last updated 2026-03-14
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