Byron Generating Station

OperatingNuclear

Ranked #2 of 6 Nuclear plants in IL#10 of 57 nationally

2449.8 MW Nuclear operating in Ogle, IL — PJM Interconnection, LLC

EIAGEMWD

2,449.8 MW

Nameplate Capacity

Generators

units

Nuclear

Technology

1985

Operating Since

Location

Coordinates

42.0742, -89.2819

County

Ogle, IL

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CSG Mt. Morris 2, LLC
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Ownership & Operator

Owner data does not fully agree across sources.

EIA typically reports the operating utility, while GEM resolves to the financial owner or parent corporation. Both can be correct.

Field	EIA	GEM	Wikidata
Operator	Constellation Nuclear	Exelon Generation	Exelon
Owner(s)	Constellation Nuclear	Exelon	—
Status	Operating	operating	—

Ownership Chain

About

The Byron Clean Energy Center is a nuclear power plant located in Ogle County, Illinois, 2 miles (3.2 km) east of the Rock River. The reactor buildings were constructed by Commonwealth Edison and house two Westinghouse Four-Loop pressurized water reactors, Unit 1 and Unit 2, which began operation in September 1985 and August 1987 respectively. The plant is owned and operated by Constellation Energy.

Read more on Wikipedia

Byron Generating Station is a 2,449.8 MW nuclear power plant located in Ogle County, Illinois. The plant began operating in 1985 and is owned by Exelon, with Constellation Nuclear as the operator. It consists of two nuclear reactors. Byron is the second-largest nuclear plant in Illinois (out of six) and the tenth-largest in the United States (out of 55).

The plant's latest annual generation was 19,914,452 MWh, achieving a capacity factor of 92.8%. Byron Generating Station is part of the PJM Interconnection balancing authority and the RFC NERC region.

Generated from EIA, GEM, and public data sources

Wikipedia EIA Plant Profile Wikidata Global Energy Monitor

Engineering & Generators

Grid Context

NERC Region

RFC

Balancing Authority

PJM Interconnection, LLC

Grid Voltage

345 kV

Regulatory Status

Entity Type

Independent Power Producer

Sector

IPP Non-CHP

Generation

1.8M MWh

Latest Month

19.9M MWh

Annual Generation

92.8%

Capacity Factor

Jan 2023 – Dec 2025

Financial Data

No financial data available for this plant.

Pricing & Market Data

HIGH confidence

Point of Interconnection

Nearest Substation

Byron Station · 345 kV

Substation Distance

< 10 km

Operator

Commonwealth Edison

Coord Source

OSM spatial

Market Position

ISO/RTO Market

PJM

LMP Node

86041201

Pricing Hub

N ILLINOIS HUB

Node Source

EIA-860 direct report

News & Articles (10)Beta

Industry·corporate

OSHA investigating after chemical leak at Byron Generating Station hospitalizes 10 employees

Federal regulators are investigating after a chemical exposure at a nuclear power plant in northwestern Illinois sent several workers to the...

OSHA (regulator)Byron Generating Station (operator)

Chicago Tribune·Yesterday

Industry·corporate

Mass Casualty Chemical Exposure Response at Byron Nuclear Generating Station in Ogle County, Illinois

Area police, firefighters and paramedics from Ogle County responded about 4:41 p.m. Tuesday, March 10, 2026 to a report of a person with...

Byron Nuclear Generating Station (operator)

arlingtoncardinal.com·3 days ago

Industry·corporate

Byron Generating Station Celebrates 4,500 Consecutive Days of Carbon-Free Nuclear Power Production & 45th Anniversary

Today the Byron Generating Station in Northern Illinois is celebrating an impressive 4500 consecutive days producing carbon-free energy for Illinois and...

Byron Generating Station (operator)

constellationenergy.com·3 weeks ago