# LaSalle Generating Station PJM Nuclear · https://askthegrid.com/assets/facilities/lasalle-generating-station LaSalle Generating Station is a nuclear power facility with 2,340 MW of EIA-reported operating capacity in LaSalle County, Illinois, registered as EIA Plant ID 6026. Exelon Generation Company, LLC is the current owner; Constellation Nuclear is the registered plant entity or operator. The plant's generating configuration is two operating nuclear boiling-reactor units supplied by General Electric. Commercial operation began on October 20, 1982. ## Key facts - Technology: Nuclear - Power capacity: 2340 MW - Operating status: operating ## Grid and market context - ISO/RTO: PJM - Balancing authority: PJM Interconnection (PJM) - Interconnection voltage: 345 kV ## Source-backed facts - Identifiers: [{"value":"6026","system":"EIA plant ID"},{"value":"1","system":"EIA generator ID — Unit 1"},{"value":"2","system":"EIA generator ID — Unit 2"},{"value":"PJM","system":"ISO/RTO"},{"value":"630","system":"PJM RPM resource ID — LASALLE NUCLEAR 1"},{"value":"631","system":"PJM RPM resource ID — LASALLE NUCLEAR 2"},{"value":"50-373","system":"NRC reactor docket — Unit 1"},{"value":"50-374","system":"NRC reactor docket — Unit 2"},{"value":"NPF-11","system":"NRC Renewed Facility Operating License — Unit 1"},{"value":"NPF-18","system":"NRC Renewed Facility Operating License — Unit 2"},{"value":"72-70","system":"NRC ISFSI docket"},{"value":"NRC-2024-0205","system":"NRC agency docket — ISFSI exemption"},{"value":"NRC-2026-0727","system":"NRC agency docket — license amendment"}] — 2026 Generation · confidence: medium - Identifiers: [{"value":"6026","system":"EIA plant ID"},{"value":"1","system":"EIA generator ID — Unit 1"},{"value":"2","system":"EIA generator ID — Unit 2"},{"value":"PJM","system":"ISO/RTO"},{"value":"630","system":"PJM RPM resource ID — LASALLE NUCLEAR 1"},{"value":"631","system":"PJM RPM resource ID — LASALLE NUCLEAR 2"},{"value":"50-373","system":"NRC reactor docket — Unit 1"},{"value":"50-374","system":"NRC reactor docket — Unit 2"},{"value":"NPF-11","system":"NRC Renewed Facility Operating License — Unit 1"},{"value":"NPF-18","system":"NRC Renewed Facility Operating License — Unit 2"},{"value":"72-70","system":"NRC ISFSI docket"},{"value":"NRC-2024-0205","system":"NRC agency docket — ISFSI exemption"},{"value":"NRC-2026-0727","system":"NRC agency docket — license amendment"}] — Nuclear reactor Ownership · confidence: medium - Identifiers: [{"value":"6026","system":"EIA plant ID"},{"value":"1","system":"EIA generator ID — Unit 1"},{"value":"2","system":"EIA generator ID — Unit 2"},{"value":"PJM","system":"ISO/RTO"},{"value":"630","system":"PJM RPM resource ID — LASALLE NUCLEAR 1"},{"value":"631","system":"PJM RPM resource ID — LASALLE NUCLEAR 2"},{"value":"50-373","system":"NRC reactor docket — Unit 1"},{"value":"50-374","system":"NRC reactor docket — Unit 2"},{"value":"NPF-11","system":"NRC Renewed Facility Operating License — Unit 1"},{"value":"NPF-18","system":"NRC Renewed Facility Operating License — Unit 2"},{"value":"72-70","system":"NRC ISFSI docket"},{"value":"NRC-2024-0205","system":"NRC agency docket — ISFSI exemption"},{"value":"NRC-2026-0727","system":"NRC agency docket — license amendment"}] — Sheet1 · confidence: medium - Identifiers: [{"value":"6026","system":"EIA plant ID"},{"value":"1","system":"EIA generator ID — Unit 1"},{"value":"2","system":"EIA generator ID — Unit 2"},{"value":"PJM","system":"ISO/RTO"},{"value":"630","system":"PJM RPM resource ID — LASALLE NUCLEAR 1"},{"value":"631","system":"PJM RPM resource ID — LASALLE NUCLEAR 2"},{"value":"50-373","system":"NRC reactor docket — Unit 1"},{"value":"50-374","system":"NRC reactor docket — Unit 2"},{"value":"NPF-11","system":"NRC Renewed Facility Operating License — Unit 1"},{"value":"NPF-18","system":"NRC Renewed Facility Operating License — Unit 2"},{"value":"72-70","system":"NRC ISFSI docket"},{"value":"NRC-2024-0205","system":"NRC agency docket — ISFSI exemption"},{"value":"NRC-2026-0727","system":"NRC agency docket — license amendment"}] — Federal Register :: Constellation Energy Generation, LLC; LaSalle County Station Units 1 and 2; Independent Spent Fuel Storage Installation; Exemption · confidence: medium - Description: LaSalle Generating Station is a two-unit nuclear facility in Marseilles, LaSalle County, Illinois. Constellation’s official project page identifies the site as LaSalle Clean Energy Center, with total site net generation of 2,320 MW. The reactors are boiling-water units supplied by General Electric, and regulatory filings refer to the facility as LaSalle County Station. — LaSalle Clean Energy Center | Constellation Energy Locations · confidence: medium - Description: LaSalle Generating Station is a two-unit nuclear facility in Marseilles, LaSalle County, Illinois. Constellation’s official project page identifies the site as LaSalle Clean Energy Center, with total site net generation of 2,320 MW. The reactors are boiling-water units supplied by General Electric, and regulatory filings refer to the facility as LaSalle County Station. — Source · confidence: medium - Canonical name: LaSalle Generating Station — Nuclear reactor Ownership · confidence: high - Identifiers.0: {"value":"6026","system":"EIA plant ID"} — 2026 Generation · confidence: medium - Identifiers.1: {"value":"1","system":"EIA generator ID — Unit 1"} — Nuclear reactor Ownership · confidence: high - Identifiers.2: {"value":"2","system":"EIA generator ID — Unit 2"} — Nuclear reactor Ownership · confidence: high - Identifiers.3: {"value":"PJM","system":"ISO/RTO"} — Sheet1 · confidence: high - Identifiers.4: {"value":"630","system":"PJM RPM resource ID — LASALLE NUCLEAR 1"} — Sheet1 · confidence: high - Identifiers.5: {"value":"631","system":"PJM RPM resource ID — LASALLE NUCLEAR 2"} — Sheet1 · confidence: high - Identifiers.8: {"value":"NPF-11","system":"NRC Renewed Facility Operating License — Unit 1"} — Federal Register :: Constellation Energy Generation, LLC; LaSalle County Station Units 1 and 2; Independent Spent Fuel Storage Installation; Exemption · confidence: medium - Identifiers.9: {"value":"NPF-18","system":"NRC Renewed Facility Operating License — Unit 2"} — Federal Register :: Constellation Energy Generation, LLC; LaSalle County Station Units 1 and 2; Independent Spent Fuel Storage Installation; Exemption · confidence: medium - Identifiers.10: {"value":"72-70","system":"NRC ISFSI docket"} — Federal Register :: Constellation Energy Generation, LLC; LaSalle County Station Units 1 and 2; Independent Spent Fuel Storage Installation; Exemption · confidence: high - Identifiers.11: {"value":"NRC-2024-0205","system":"NRC agency docket — ISFSI exemption"} — Federal Register :: Constellation Energy Generation, LLC; LaSalle County Station Units 1 and 2; Independent Spent Fuel Storage Installation; Exemption · confidence: high - Parties.3: {"relationship":"Nuclear steam supply system and reactor manufacturer","name":"General Electric","official_url":"https://www.ge.com"} — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: high - Parties.4: {"relationship":"Balance-of-plant designer and constructor / consulting engineer","name":"Sargent & Lundy","official_url":"https://www.sargentlundy.com"} — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: high - Parties.5: {"relationship":"PJM utility and transmission owner listed for the resources","name":"COMED","official_url":"https://www.comed.com"} — Sheet1 · confidence: high - Site acres: 3055 — LaSalle Clean Energy Center · confidence: medium - Unit configuration: Two operating nuclear boiling-reactor units supplied by General Electric. — LaSalle Clean Energy Center · confidence: medium - Commercial operation date: 1982-10-20 — LaSalle Clean Energy Center · confidence: medium - Power mw: 2320 — LaSalle Clean Energy Center · confidence: medium - Unit count: 2 — LaSalle Clean Energy Center · confidence: high - Construction scope: Two operating General Electric boiling-water reactor units (LaSalle County Units 1 and 2); GE supplied the nuclear steam supply systems, while Sargent & Lundy designed and constructed the balance of plant. The site also includes a 2,058-acre cooling lake and five onsite standby diesel generators serving the two units. — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: medium - Product url: https://www.gevernova.com/nuclear/carbon-free-power/large-reactors — Large nuclear boiling water reactor | GE Vernova Hitachi · confidence: medium - Kind: nuclear — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: high - Manufacturer name: General Electric — LaSalle Clean Energy Center · confidence: high - Manufacturer name: General Electric — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: high - Significance: LaSalle is a two-unit boiling-water nuclear station with up to 2,320 MW of site net generation, sufficient to power the equivalent of more than 1.7 million homes. Its cooling system includes a 2,058-acre man-made lake. — Source · confidence: medium - Quality notes: ["The owner’s fact sheet reports 2,320 MW of total site net generation, while other plant directories report approximately 2,340 MW; the owner-reported net figure is used here.","The August 2000 NRC action was a regulated license and ownership transfer in connection with the Unicom–PECO merger, rather than a disclosed arm’s-length sale of LaSalle with a published purchase price.","The NRC transfer order identifies minimum decommissioning-trust amounts for the two units; those amounts are trust-fund transfers and should not be treated as sale consideration or project-finance proceeds.","The cited records establish continued operation and renewed licenses through 2042–2043; no retirement or repowering event is identified for LaSalle."] — Source · confidence: medium - Quality notes: ["The owner’s fact sheet reports 2,320 MW of total site net generation, while other plant directories report approximately 2,340 MW; the owner-reported net figure is used here.","The August 2000 NRC action was a regulated license and ownership transfer in connection with the Unicom–PECO merger, rather than a disclosed arm’s-length sale of LaSalle with a published purchase price.","The NRC transfer order identifies minimum decommissioning-trust amounts for the two units; those amounts are trust-fund transfers and should not be treated as sale consideration or project-finance proceeds.","The cited records establish continued operation and renewed licenses through 2042–2043; no retirement or repowering event is identified for LaSalle."] — LaSalle Clean Energy Center | Constellation Energy Locations · confidence: medium - Financing summary: No LaSalle-specific project-financing debt amount or sale consideration is disclosed in the cited records. The August 2000 NRC transfer order required Commonwealth Edison to transfer minimum decommissioning-trust amounts of $226,262,522 for Unit 1 and $221,885,059 for Unit 2 to Exelon Generation when the units transferred; these were regulatory trust-fund requirements, not purchase consideration. Exelon filings describe sale, lease, or leaseback arrangements as financing mechanisms generally, but do not identify a LaSalle-specific financing transaction or amount. — Federal Register :: In the Matter of Commonwealth Edison Company; (LaSalle County Station, Units 1 and 2); Order Approving Transfer of Licenses and Conforming Amendments · confidence: medium - Commercial parties.3: {"relationship":"Nuclear steam-supply-system and reactor manufacturer","name":"General Electric","detail":"Supplied the nuclear steam supply system for both boiling-water reactor units.","official_url":"https://www.ge.com"} — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: high - Commercial parties.4: {"relationship":"Balance-of-plant designer and constructor","name":"Sargent & Lundy","detail":"Originally designed and constructed the balance of plant for Units 1 and 2.","official_url":"https://www.sargentlundy.com"} — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: high - Quality notes.0: The owner’s fact sheet reports 2,320 MW of total site net generation, while other plant directories report approximately 2,340 MW; the owner-reported net figure is used here. — Source · confidence: medium - Quality notes.2: The NRC transfer order identifies minimum decommissioning-trust amounts for the two units; those amounts are trust-fund transfers and should not be treated as sale consideration or project-finance proceeds. — Federal Register :: In the Matter of Commonwealth Edison Company; (LaSalle County Station, Units 1 and 2); Order Approving Transfer of Licenses and Conforming Amendments · confidence: medium - Quality notes.3: The cited records establish continued operation and renewed licenses through 2042–2043; no retirement or repowering event is identified for LaSalle. — LaSalle Clean Energy Center | Constellation Energy Locations · confidence: medium - Timeline.0: {"event":"Construction permits issued","date":"1973-09-07","detail":"The NRC issued construction permits CPPR-99 for Unit 1 and CPPR-100 for Unit 2."} — Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission · confidence: high - Timeline.2: {"event":"Unit 1 commercial operation","date":"1982-10-20","detail":"Unit 1 entered commercial service."} — Source · confidence: high - Timeline.4: {"event":"Unit 2 commercial operation","date":"1984-10-19","detail":"Unit 2 entered commercial service."} — Source · confidence: medium - Timeline.7: {"event":"Measurement-uncertainty recapture power uprate","date":"2010-09-16","detail":"The NRC issued amendments authorizing the LaSalle Units 1 and 2 measurement-uncertainty recapture uprate. The approved change increased rated thermal power by approximately 1.65%, with the regulatory evaluation bounding an increase of about 20 MWe per unit."} — Source · confidence: medium - Timeline.8: {"event":"Initial license renewal approved","date":"2016-10-19","detail":"The NRC approved renewed operating authorization allowing Unit 1 to operate through 2042 and Unit 2 through 2043."} — LaSalle Clean Energy Center | Constellation Energy Locations · confidence: high - Ownership interest pct: 100 — Federal Register :: In the Matter of Commonwealth Edison Company; (LaSalle County Station, Units 1 and 2); Order Approving Transfer of Licenses and Conforming Amendments · confidence: medium - Replacement or repowering: A PJM Reliability Resource Initiative project provides for a LaSalle nuclear uprate, including a listed 174-MW Unit 2 uprate targeted for first-quarter 2029; this is an uprate rather than a retirement or fuel conversion. — Reliability Resource Initiative Additional Summaries · confidence: medium - Replacement or repowering: A PJM Reliability Resource Initiative project provides for a LaSalle nuclear uprate, including a listed 174-MW Unit 2 uprate targeted for first-quarter 2029; this is an uprate rather than a retirement or fuel conversion. — New or Restarted Generation Facilities in PJM · confidence: medium - Status detail: LaSalle is operating with two units. Constellation's site fact sheet reports two operating units, while an NRC filing dated March 2, 2026 documents active Unit 1 Cycle 22 operating-limit work. Renewed licenses authorize Unit 1 to operate through April 17, 2042 and Unit 2 through December 16, 2043. — LaSalle Clean Energy Center · confidence: high - Operating status: operating — LaSalle Clean Energy Center · confidence: high ## Timeline - 1973-09-07 — Construction permits issued The NRC issued construction permits CPPR-99 for Unit 1 and CPPR-100 for Unit 2. Source: Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission (https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr2205/index) - 1982-04-17 — Unit 1 operating license issued The NRC issued Unit 1 operating license NPF-11. Source: Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission (https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr2205/index) - 1982-10-20 — Unit 1 commercial operation Unit 1 entered commercial service. Source: Source (https://constellationenergy.com/content/dam/constellationenergy/pdfs/fact-sheets/Lasalle_Clean_Energy_Center_Fact_Sheet.pdf) - 1983-12-16 — Unit 2 operating license issued The NRC issued Unit 2 operating license NPF-18. Source: Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission (https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr2205/index) - 1984-10-19 — Unit 2 commercial operation Unit 2 entered commercial service. Source: Source (https://constellationenergy.com/content/dam/constellationenergy/pdfs/fact-sheets/Lasalle_Clean_Energy_Center_Fact_Sheet.pdf) - 2000-08-03 — License-transfer approval The NRC approved Commonwealth Edison’s proposed transfer of the LaSalle operating licenses to Exelon Generation Company, LLC. The order stated that Exelon Generation would become the sole owner and operator after completion of the transfer; Commonwealth Edison was the predecessor owner and transferor. Source: Federal Register :: In the Matter of Commonwealth Edison Company; (LaSalle County Station, Units 1 and 2); Order Approving Transfer of Licenses and Conforming Amendments (https://www.federalregister.gov/documents/2000/08/14/00-20573/in-the-matter-of-commonwealth-edison-company-lasalle-county-station-units-1-and-2-order-approving) - 2016-10-19 — Initial license renewal approved The NRC approved renewed operating authorization allowing Unit 1 to operate through 2042 and Unit 2 through 2043. Source: LaSalle Clean Energy Center | Constellation Energy Locations (https://www.constellationenergy.com/about/locations/lasalle-clean-energy-center.html) ## Sources - [LaSalle Clean Energy Center | Constellation Energy Locations](https://www.constellationenergy.com/about/locations/lasalle-clean-energy-center.html) — constellationenergy.com · tier other - [2026 Generation](https://www.eia.gov/nuclear/generation/xls/usreact26.xlsx) — eia.gov · tier regulatory - [Nuclear reactor Ownership](https://www.eia.gov/nuclear/reactors/reactorcapacity.php) — eia.gov · tier regulatory - [Sheet1](https://www.pjm.com/-/media/DotCom/markets-ops/rpm/rpm-auction-info/2025-2026/2025-2026-rpm-existing-resource-list-post.xlsx) — pjm.com · tier other - [Federal Register :: Constellation Energy Generation, LLC; LaSalle County Station Units 1 and 2; Independent Spent Fuel Storage Installation; Exemption](https://www.federalregister.gov/documents/2025/01/07/2025-00116/constellation-energy-generation-llc-lasalle-county-station-units-1-and-2-independent-spent-fuel) — federalregister.gov · tier regulatory - [LaSalle Clean Energy Center](https://www.constellationenergy.com/content/dam/constellationenergy/pdfs/fact-sheets/Lasalle_Clean_Energy_Center_Fact_Sheet.pdf) — constellationenergy.com · tier other - [Safety Evaluation Report, Related to the License Renewal of LaSalle County Station, Units 1 and 2, Docket Nos. 50-373 and 50-374, Exelon Generation Company, LLC (NUREG-2205) | Nuclear Regulatory Commission](https://www.nrc.gov/reading-rm/doc-collections/nuregs/staff/sr2205/index) — nrc.gov · tier regulatory - [Large nuclear boiling water reactor | GE Vernova Hitachi](https://www.gevernova.com/nuclear/carbon-free-power/large-reactors) — gevernova.com · tier other - [Source](https://constellationenergy.com/content/dam/constellationenergy/pdfs/fact-sheets/Lasalle_Clean_Energy_Center_Fact_Sheet.pdf) — constellationenergy.com · tier other - [Federal Register :: In the Matter of Commonwealth Edison Company; (LaSalle County Station, Units 1 and 2); Order Approving Transfer of Licenses and Conforming Amendments](https://www.federalregister.gov/documents/2000/08/14/00-20573/in-the-matter-of-commonwealth-edison-company-lasalle-county-station-units-1-and-2-order-approving) — federalregister.gov · tier regulatory - [Source](https://www.nrc.gov/docs/ML2028/ML20282A667.pdf) — nrc.gov · tier regulatory - [Source](https://www.nrc.gov/docs/ML1018/ML101830361.pdf) — nrc.gov · tier regulatory - [LaSalle County Station, Units 1 and 2, FRN: License Renewal and Record of Decision; Issuance.](https://www.nrc.gov/docs/ML1620/ML16202A033.pdf) — nrc.gov · tier regulatory - [Reliability Resource Initiative Additional Summaries](https://www.pjm.com/-/media/DotCom/committees-groups/committees/pc/2025/20250506/20250506-rri-addendum---post-meeting.pdf) — pjm.com · tier other - [New or Restarted Generation Facilities in PJM](https://epsa.org/wp-content/uploads/2026/03/P3New-Generation-FacilitiesOne-Pager_March-2026.pdf) — epsa.org · tier other ## Data quality - The owner’s fact sheet reports 2,320 MW of total site net generation, while other plant directories report approximately 2,340 MW; the owner-reported net figure is used here. The August 2000 NRC action was a regulated license and ownership transfer in connection with the Unicom–PECO merger, rather than a disclosed arm’s-length sale of LaSalle with a published purchase price. The NRC transfer order identifies minimum decommissioning-trust amounts for the two units; those amounts are trust-fund transfers and should not be treated as sale consideration or project-finance proceeds. The cited records establish continued operation and renewed licenses through 2042–2043; no retirement or repowering event is identified for LaSalle. --- Canonical page: https://askthegrid.com/assets/facilities/lasalle-generating-station Source: Ask the Grid — https://askthegrid.com/