Harding Street
AES IndianaMarion County
Aerial photograph of Harding Street Station.
Source: AES IndianaHarding Street Station, EIA plant 990, is a 1,064.7 MW electric generating facility located at 3700 South Harding Street, Indianapolis, Marion County, Indiana, operated by AES Indiana (Indianapolis Power & Light Company d/b/a AES Indiana) in the MISO region. The station comprises ten operating generators: three natural-gas-fired steam turbines (Units 5, 6, 7; 100, 100, and 463 MW respectively), five combustion turbines and one internal-combustion unit operating on natural gas and/or distillate fuel oil (GT1, GT2, GT4, GT5, GT6, IC1; 26, 26, 83, 83, 161, and 2.7 MW respectively), and one 20 MW lithium-ion battery energy storage system (BAT1). Units 5, 6, and 7 were converted from coal to natural gas between December 2015 and Q2 2016.
Mapped infrastructure geometry associated with this asset.
EIA plant 990 · Inventory for Aug 2026.
| Generator | Technology | Status | Power (MW) | Energy (MWh) |
|---|---|---|---|---|
| 5 | Natural Gas Steam Turbine | Operating | 100 | Unknown |
| 6 | Natural Gas Steam Turbine | Operating | 100 | Unknown |
Similar plants ranked by technology, capacity, and distance.
Operating generator records and technology attributes reported through EIA-860.
| Generator | Capacity | Technology | Operation | Status |
|---|---|---|---|---|
| 3 | 43.8 MW 35 MW summer | Petroleum Liquids Disillate Fuel Oil · ST | — | Operating |
| 4 | 43.8 MW 35 MW summer | Petroleum Liquids Disillate Fuel Oil · ST | — | Operating |
| 5 | 100 MW 101 MW summer | Natural Gas Steam Turbine Natural Gas · ST | Jun 1958 | Operating |
| 6 | 100 MW 99 MW summer | Natural Gas Steam Turbine Natural Gas · ST | May 1961 | Operating |
| 7 | 463 MW 418 MW summer | |||
Monthly EIA generation history and recent market-resource behavior where linked telemetry is available.
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Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.
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Project milestones and public references behind the asset profile.
Harding Street Station began operations in 1931; the oldest operating unit (Unit 5) entered service in June 1958.
| 7 | Natural Gas Steam Turbine | Operating | 463 | Unknown |
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| BAT1 | Batteries | Operating | 20 | 20 |
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| GT1 | Petroleum Liquids | Operating | 26 | Unknown |
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| GT2 | Petroleum Liquids | Operating | 26 | Unknown |
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| GT4 | Natural Gas Fired Combustion Turbine | Operating | 83 | Unknown |
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| GT5 | Natural Gas Fired Combustion Turbine | Operating | 83 | Unknown |
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| GT6 | Natural Gas Fired Combustion Turbine | Operating | 161 | Unknown |
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| IC1 | Petroleum Liquids | Operating | 2.7 | Unknown |
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| 3 | Petroleum Liquids | Retired | 43.8 | Unknown |
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| 4 | Petroleum Liquids | Retired | 43.8 | Unknown |
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| GT3 | Petroleum Liquids | Retired | 26 | Unknown |
|---|
Monthly generation is reported through EIA-923. Capacity factor uses the current EIA nameplate capacity and is shown only for complete calendar years.
| Largest reported plants | Capacity | State | |
|---|---|---|---|
| AES Petersburg | 1,349.9 MW | IN | |
| Harding StreetCurrent | 1,064.7 MW | IN | |
| Eagle Valley (IN) | 644 MW | IN | |
| Georgetown | 340 MW | IN | |
| Hoosier Wind Project LLC | 106 MW | IN |
Portfolio membership follows the latest EIA-860 reporting entity. It does not imply ultimate ownership.
View full reporting portfolioEIA-860 lists generator 5 with this operating date.
EIA-860 lists generator 6 with this operating date.
EIA-860 lists generator IC1 with this operating date.
EIA-860 lists generator GT1, generator GT2, generator GT3 with this operating date.
EIA-860 lists generator 7 with this operating date.
EIA-860 lists generator GT4 with this operating date.
EIA-860 lists generator GT5 with this operating date.
AES completed its merger with IPALCO through a share exchange on March 27, 2001. Each IPALCO common share was converted into 0.463 AES shares. AES issued approximately 41.5 million shares. IPALCO became a wholly owned subsidiary of AES.
EIA-860 lists generator GT6 with this operating date.
AES Indiana announced that Harding Street had burned coal for the last time on March 25, 2016, as the station neared completion of its two-year coal-to-natural-gas conversion program.
Answered from the published record above. Questions whose inputs this profile does not carry are omitted rather than estimated.
Harding Street reports 990 MW natural gas + 20 MW battery storage + 54.7 MW petroleum of operating nameplate capacity. These technology ratings do not establish a common export limit. Source: EIA Aug 2026.
Harding Street is a Natural Gas Fired Combustion Turbine, Natural Gas Steam Turbine, Batteries, Petroleum Liquids facility in Marion County, IN, participating in the MISO market.
Harding Street is in Marion County, IN, inside the MISO balancing area.
Harding Street is operated by AES Indiana according to the EIA generator inventory. Reporting membership does not by itself establish ultimate ownership.
Harding Street reported 4,081.6 GWh over the twelve months to 2026-07. Figures are net generation as filed to EIA-923.
By capacity, Harding Street ranks #44 of 259 operating plants of the same technology nationally. It ranks #1 of 11 in IN.
Plants within 25 km, nearest first, regardless of technology. Proximity is straight-line distance between mapped plant coordinates; it does not by itself establish a shared point of interconnection.