How big is MPH Elwood?

MPH Elwood is a natural gas-fired power facility with 768 MW of EIA-reported nameplate capacity in Will County, Illinois, registered as EIA Plant ID 69979. Elwood was described as one of the largest independent peaking power facilities in the United States.

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Reported capacity: 768 MW
EIA-reported nameplate capacity; other nameplate and seasonal ratings may differ.
Technology: Natural Gas Fired Combustion Turbine
Primary generation technology.
Registry anchor: Plant 69979
Will County · PJM
Operating status: Operating

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plant:plant-69979

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Units and generators

Operating generator records and technology attributes reported through EIA-860.

Generator	Capacity	Technology	Operation	Status
GT1	192 MW 150 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jul 1999	Operating
GT2	192 MW 150 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jul 1999	Operating
GT3	192 MW 150 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jul 1999	Operating
GT4	192 MW 150 MW summer	Natural Gas Fired Combustion Turbine Natural Gas · GT	Jul 1999	Operating

Commercial, land, and environmental record

Source-backed project transactions, agreements, land records, permits, and environmental disclosures. Portfolio and adjacent-project facts remain explicitly scoped.

Land and environmental record

Cooling-Water And Wastewater Controls

2025

Outfalls 001-004 limited to evaporative cooling water and stormwater runoff

NPDES conditions identify outfalls 001-004 as evaporative cooling water and stormwater runoff with monitoring for flow, pH, and temperature. Outfalls limited to evaporative cooling water and stormwater runoff, free from process and other wastewater discharges. Simple-cycle combustion not subject to steam-electric rules.

NPDES Permit No. IL0080300 Notice No. 25090901.docx Public Notice Beginning Date: December 10, 2025 Public Notice Ending Date: January 9,

County Appraisal And Parcel Record

2025

21.47 acres

Will County appraisal identifies MPH ELWOOD LLC as owner of Illinois parcel with 21.47 non-farm and total acres. Parcel PIN 10-11-07-400-012-0000; legal description: part of southeast quarter of Section 7, Township 34 North, Range 10 East.

Comptroller - JETI

Emissions Control And Monitoring

2000

Low-NOx combustion and NOx CEMS; normal operation 0.05-0.055 lb NOx/mmBtu; permit limit 0.061 lb NOx/mmBtu

Illinois environmental records state Elwood units have separate continuous emissions monitoring systems measuring NOx under Acid Rain regulations. Low-NOx combustors; normal operation ~0.05-0.055 lb NOx/mmBtu; permit limit 0.061 lb NOx/mmBtu (15 ppm); startup rates ~0.1-0.115 lb NOx/mmBtu.

Source

Water Discharge

2025

0.017 MGD average evaporative-cooling-water and stormwater discharge

Illinois EPA NPDES fact sheet states simple-cycle combustion-turbine facility operation results in average discharge of 0.017 million gallons per day through outfalls 001-004. Receiving waters: storm sewers tributary to unnamed tributary to Cedar Creek.

NPDES Permit No. IL0080300 Notice No. 25090901.docx Public Notice Beginning Date: December 10, 2025 Public Notice Ending Date: January 9,

Water-Quality Compliance Condition

2025

NPDES effluent monitoring: pH 6.5-9.0; temperature monitored when discharging

Permit specifies pH range 6.5 to 9.0 and monthly estimated flow and grab-sample monitoring. Temperature monitored by grab sample when evaporative cooling water discharged. Outfalls discharge to storm-sewer tributaries of unnamed tributary to Cedar Creek.

NPDES Permit No. IL0080300 Notice No. 25090901.docx Public Notice Beginning Date: December 10, 2025 Public Notice Ending Date: January 9,

MPH Elwood

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MPH Elwood

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