# NRG Rockford I

PJM Natural Gas Fired Combustion Turbine · https://askthegrid.com/assets/facilities/nrg-rockford-i

NRG Rockford I is a natural gas-fired power facility with 316 MW of EIA-reported nameplate capacity in Winnebago County, Illinois, registered as EIA Plant ID 55238.
COMED load zone · 138 kV · Commonwealth Edison Co (ComEd).

## Key facts

- Technology: Natural Gas Fired Combustion Turbine
- Power capacity: 316 MW
- Operating status: operating

## Grid and market context

- ISO/RTO: PJM
- Balancing authority: PJM Interconnection, LLC (PJM)

## Source-backed facts

- Owner logo domain: nrg.com — Welcome to NRG · confidence: medium
- Identifiers: [{"value":"55238","system":"EIA plant ID"},{"value":"60504","system":"EIA utility ID"},{"value":"55238","system":"EPA GHGRP plant code"},{"value":"0001","system":"EPA GHGRP generator unit"},{"value":"0002","system":"EPA GHGRP generator unit"},{"value":"NCR11660","system":"NERC registered entity ID"},{"value":"ROCGN","system":"NERC registered entity acronym"},{"value":"PJM Interconnection (PJM)","system":"ISO/RTO and balancing authority"},{"value":"PCB 15-086","system":"Illinois Pollution Control Board docket"}] — GHG Summary Report · confidence: medium
- Identifiers: [{"value":"55238","system":"EIA plant ID"},{"value":"60504","system":"EIA utility ID"},{"value":"55238","system":"EPA GHGRP plant code"},{"value":"0001","system":"EPA GHGRP generator unit"},{"value":"0002","system":"EPA GHGRP generator unit"},{"value":"NCR11660","system":"NERC registered entity ID"},{"value":"ROCGN","system":"NERC registered entity acronym"},{"value":"PJM Interconnection (PJM)","system":"ISO/RTO and balancing authority"},{"value":"PCB 15-086","system":"Illinois Pollution Control Board docket"}] — Source · confidence: medium
- Identifiers: [{"value":"55238","system":"EIA plant ID"},{"value":"60504","system":"EIA utility ID"},{"value":"55238","system":"EPA GHGRP plant code"},{"value":"0001","system":"EPA GHGRP generator unit"},{"value":"0002","system":"EPA GHGRP generator unit"},{"value":"NCR11660","system":"NERC registered entity ID"},{"value":"ROCGN","system":"NERC registered entity acronym"},{"value":"PJM Interconnection (PJM)","system":"ISO/RTO and balancing authority"},{"value":"PCB 15-086","system":"Illinois Pollution Control Board docket"}] — Electronic Filing - Received, Clerk's Office : 08/10/2016 · confidence: medium
- Owner name: NRG Energy, Inc. — FIRST QUARTER 2026 EARNINGS PRESENTATION · confidence: medium
- Description: NRG Rockford I is an operating 316-MW natural-gas power plant in Rockford, Winnebago County, Illinois, at 136 Harrison Avenue. The plant is a simple-cycle facility with two electricity-generating units, identified in EPA records as units 0001 and 0002, and operates within the PJM footprint. NRG Energy completed its acquisition of the applicable LS Power generation portfolio in January 2026. — Electronic Filing - Received, Clerk's Office : 08/10/2016 · confidence: medium
- Description: NRG Rockford I is an operating 316-MW natural-gas power plant in Rockford, Winnebago County, Illinois, at 136 Harrison Avenue. The plant is a simple-cycle facility with two electricity-generating units, identified in EPA records as units 0001 and 0002, and operates within the PJM footprint. NRG Energy completed its acquisition of the applicable LS Power generation portfolio in January 2026. — GHG Summary Report · confidence: medium
- Description: NRG Rockford I is an operating 316-MW natural-gas power plant in Rockford, Winnebago County, Illinois, at 136 Harrison Avenue. The plant is a simple-cycle facility with two electricity-generating units, identified in EPA records as units 0001 and 0002, and operates within the PJM footprint. NRG Energy completed its acquisition of the applicable LS Power generation portfolio in January 2026. — LS Power Completes Acquisition of Illinois Power Generation Facilities from NRG Energy - LS Power · confidence: medium
- Identifiers.2: {"value":"55238","system":"EPA GHGRP plant code"} — GHG Summary Report · confidence: high
- Identifiers.3: {"value":"0001","system":"EPA GHGRP generator unit"} — GHG Summary Report · confidence: high
- Identifiers.4: {"value":"0002","system":"EPA GHGRP generator unit"} — GHG Summary Report · confidence: high
- Identifiers.5: {"value":"NCR11660","system":"NERC registered entity ID"} — Source · confidence: high
- Identifiers.6: {"value":"ROCGN","system":"NERC registered entity acronym"} — Source · confidence: high
- Identifiers.7: {"value":"PJM Interconnection (PJM)","system":"ISO/RTO and balancing authority"} — Source · confidence: high
- Identifiers.8: {"value":"PCB 15-086","system":"Illinois Pollution Control Board docket"} — Electronic Filing - Received, Clerk's Office : 08/10/2016 · confidence: medium
- Parties.1: {"relationship":"Plant-owning and operating entity; EIA utility and NERC registered entity","name":"Rockford Generation LLC","official_url":null} — Source · confidence: medium
- Parties.2: {"relationship":"Former owner and developer","name":"LS Power Development LLC","official_url":"https://www.lspower.com/"} — LS Power Completes Acquisition of Illinois Power Generation Facilities from NRG Energy - LS Power · confidence: high
- Parties.3: {"relationship":"Operations and maintenance contractor","name":"IHI Power Services Corp.","official_url":"https://www.ihipower.com/"} — Power plant profile: Rockford I Generating Station, US · confidence: medium
- Parties.3: {"relationship":"Operations and maintenance contractor","name":"IHI Power Services Corp.","official_url":"https://www.ihipower.com/"} — Power Plant Operations & Management Services | IHI Power... · confidence: medium
- Parties.4: {"relationship":"Gas-turbine OEM","name":"Siemens Energy","official_url":"https://www.siemens-energy.com/"} — Power plant profile: Rockford I Generating Station, US · confidence: medium
- Parties.4: {"relationship":"Gas-turbine OEM","name":"Siemens Energy","official_url":"https://www.siemens-energy.com/"} — SGT5-4000F heavy duty gas turbine for commercial... · confidence: medium
- Product url: https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium
- Manufacturer domain: siemens-energy.com — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium
- Manufacturer name: Siemens Energy — SGT6-5000F Heavy-duty gas turbine (60 Hz) · confidence: medium
- Quality notes: ["The 450-MW figure in LS Power's transaction announcements refers to the combined Rockford I and II Energy Center; the exact EIA plant covered here is Rockford I, identified separately at 316 MW with two generating units.","The approximately $55 million announced purchase price and $56 million of reported cash proceeds relate to the 2016 Rockford sale transaction and are not an allocated value for Rockford I alone.","The approximately $12.0 billion enterprise value, assumed debt, and acquisition financing described for the January 2026 NRG-LS Power transaction are portfolio-level figures, not project-level financing for Rockford I.","The available plant record continues to identify Rockford I as an operating 316-MW facility; no separate retirement, uprate, expansion, or repowering milestone is identified for this exact plant."] — NRG Energy, Inc. · confidence: medium
- Quality notes.0: The 450-MW figure in LS Power's transaction announcements refers to the combined Rockford I and II Energy Center; the exact EIA plant covered here is Rockford I, identified separately at 316 MW with two generating units. — LS Power Completes Acquisition of Illinois Power Generation Facilities from NRG Energy - LS Power · confidence: medium
- Quality notes.1: The approximately $55 million announced purchase price and $56 million of reported cash proceeds relate to the 2016 Rockford sale transaction and are not an allocated value for Rockford I alone. — NRG Energy, Inc. · confidence: medium
- Timeline.1: {"event":"Substantial completion and commissioning","date":"2000-06","detail":"Gemma Power Systems reported substantial completion in June 2000, and the Rockford I generating-station profile identifies June 2000 as the commissioning month."} — Power plant profile: Rockford I Generating Station, US · confidence: medium
- Timeline.5: {"event":"Sale to LS Power completed","date":"2016-07-12","detail":"NRG completed the sale of Rockford for reported cash proceeds of $56 million, including PJM-related adjustments. LS Power subsequently held the Rockford Generation assets."} — NRG Energy, Inc. · confidence: high
- Timeline.5: {"event":"Sale to LS Power completed","date":"2016-07-12","detail":"NRG completed the sale of Rockford for reported cash proceeds of $56 million, including PJM-related adjustments. LS Power subsequently held the Rockford Generation assets."} — LS Power Completes Acquisition of Illinois Power Generation Facilities from NRG Energy - LS Power · confidence: high
- Commercial parties.2: {"relationship":"Former owner and purchaser in 2016","name":"LS Power Equity Advisors / LS Power","detail":"Through a private fund, acquired NRG's Aurora and Rockford I and II simple-cycle natural-gas facilities; LS Power later sold its generation portfolio to NRG in January 2026.","official_url":"https://www.lspower.com/"} — LS Power Completes Acquisition of Illinois Power Generation Facilities from NRG Energy - LS Power · confidence: medium
- Commercial parties.6: {"relationship":"Turbine and generator supplier","name":"Siemens Energy","detail":"The project profile identifies Siemens as the turbine supplier and Siemens Energy as the electric-generator supplier for the two-unit gas-turbine project.","official_url":"https://www.siemens-energy.com/"} — Power plant profile: Rockford I Generating Station, US · confidence: medium
- Commercial parties.7: {"relationship":"Operations and maintenance contractor","name":"IHI Power Services Corp.","detail":"Identified as the thermal-power operations and maintenance contractor; its O&M contract commenced in 2016 according to the project profile.","official_url":"https://www.ihipower.com/"} — Power plant profile: Rockford I Generating Station, US · confidence: medium
- Acquisition detail: NRG Energy completed its acquisition from LS Power of the LS Power generation portfolio on 2026-01-30. NRG's transaction filing lists Rockford Generation LLC in Rockford among the generation facilities, supporting that the portfolio included Rockford I. Historically, LS Power had acquired the Rockford I and II Energy Center from NRG in 2016. — Source · confidence: medium
- Retirement date: 2026-06-01 — Source · confidence: medium
- Retirement scope: unit — Source · confidence: medium
- Status detail: NRG Rockford I has two EIA generators, 0001 and 0002, both listed as operating. PJM records identify the corresponding Rockford CT 11 and CT 12 resources as 981 and 982 in the COMED zone. A May 2025 PJM deactivation update listed CT11 and CT12 among units with a requested deactivation date of 2026-06-01, but the plant remained represented in NRG's May 2026 portfolio and in PJM's 2026-2027 existing-resource list; the requested date is therefore treated as a unit-level announced deactivation date, not confirmed whole-plant retirement. — FIRST QUARTER 2026 EARNINGS PRESENTATION · confidence: medium
- Status detail: NRG Rockford I has two EIA generators, 0001 and 0002, both listed as operating. PJM records identify the corresponding Rockford CT 11 and CT 12 resources as 981 and 982 in the COMED zone. A May 2025 PJM deactivation update listed CT11 and CT12 among units with a requested deactivation date of 2026-06-01, but the plant remained represented in NRG's May 2026 portfolio and in PJM's 2026-2027 existing-resource list; the requested date is therefore treated as a unit-level announced deactivation date, not confirmed whole-plant retirement. — Sheet1 · confidence: medium
- Status detail: NRG Rockford I has two EIA generators, 0001 and 0002, both listed as operating. PJM records identify the corresponding Rockford CT 11 and CT 12 resources as 981 and 982 in the COMED zone. A May 2025 PJM deactivation update listed CT11 and CT12 among units with a requested deactivation date of 2026-06-01, but the plant remained represented in NRG's May 2026 portfolio and in PJM's 2026-2027 existing-resource list; the requested date is therefore treated as a unit-level announced deactivation date, not confirmed whole-plant retirement. — Source · confidence: medium
- Grid role: Natural-gas combustion-turbine peaking generation — NRG Energy, Inc. - Investors · confidence: medium
- Operating status: operating — FIRST QUARTER 2026 EARNINGS PRESENTATION · confidence: medium

## Timeline

- 2000-01 — Construction began
  Construction of the Rockford Peaking Project began in late January 2000. The project comprised two simple-cycle Siemens-Westinghouse V-84.3a combustion turbines and was developed for Indeck Energy Services.
  Source: Our Work - Rockford Peaking Project (https://www.gemmapower.com/our-work/simple-cycle/rockford-peaking-project)
- 2000-06 — Substantial completion and commissioning
  Gemma Power Systems reported substantial completion in June 2000, and the Rockford I generating-station profile identifies June 2000 as the commissioning month.
  Source: Our Work - Rockford Peaking Project (https://www.gemmapower.com/our-work/simple-cycle/rockford-peaking-project)

## Sources

- [Welcome to NRG](https://www.nrg.com/) — nrg.com · tier other
- [GHG Summary Report](https://ghgdata.epa.gov/ghgp/html/2023.do?id=1006554&et=undefined) — ghgdata.epa.gov · tier regulatory
- [Source](https://www.nerc.com/globalassets/our-work/reports/regional-audit-reports-of-registered-entities/rfc/2020/ncr11660_rocgn_rf_pub_2017.pdf) — nerc.com · tier other
- [Electronic Filing - Received, Clerk's Office : 08/10/2016](https://pcb.illinois.gov/documents/dsweb/Get/Version-99046/PCB%2015-86%2C081016%20PtnrMtnNameChg%20Aprncs%20BFT%20KN.pdf) — pcb.illinois.gov · tier regulatory
- [FIRST QUARTER 2026 EARNINGS PRESENTATION](https://investors.nrg.com/static-files/6e6dc645-a314-4beb-93bb-de0e1c5a0bfd) — investors.nrg.com · tier other
- [LS Power Completes Acquisition of Illinois Power Generation Facilities from NRG Energy - LS Power](https://www.lspower.com/news/ls-power-completes-acquisition-power-generation-facilities-nrg-energy/) — lspower.com · tier other
- [Power plant profile: Rockford I Generating Station, US](https://www.power-technology.com/data-insights/power-plant-profile-rockford-i-generating-station-us/) — power-technology.com · tier other
- [Power Plant Operations & Management Services | IHI Power ...](https://www.ihipower.com/) — ihipower.com · tier other
- [SGT5-4000F heavy duty gas turbine for commercial ...](https://www.siemens-energy.com/global/en/home/products-services/product/sgt5-4000f.html) — siemens-energy.com · tier other
- [SGT6-5000F Heavy-duty gas turbine (60 Hz)](https://www.siemens-energy.com/global/en/home/products-services/product/sgt6-5000f.html) — siemens-energy.com · tier other
- [Our Work - Rockford Peaking Project](https://www.gemmapower.com/our-work/simple-cycle/rockford-peaking-project) — gemmapower.com · tier other
- [NRG Energy, Inc.](https://www.sec.gov/Archives/edgar/data/1013871/000101387116000032/nrg2016063010q.htm) — sec.gov · tier regulatory
- [LS Power to Acquire Power Generation Facilities from NRG Energy - LS Power](https://www.lspower.com/news/ls-power-agrees-acquire-power-generation-facilities-nrg-energy/) — lspower.com · tier other
- [Source](https://lspower.com/news/ls-power-completes-acquisition-power-generation-facilities-nrg-energy) — lspower.com · tier other
- [NRG Rockford I power station - Global Energy Monitor](https://www.gem.wiki/NRG_Rockford_I_power_station) — gem.wiki · tier other
- [Source](https://www.iso-ne.com/static-assets/documents/100022/2025_05_02_item_03_1_ipsac_pjm_regional_transmission_expansion_planning_proces.pdf) — iso-ne.com · tier other
- [Sheet1](https://www.pjm.com/-/media/DotCom/markets-ops/rpm/rpm-auction-info/2026-2027/2026-2027-rpm-existing-resource-list-post.xlsx) — pjm.com · tier other
- [NRG Energy, Inc. - Investors](https://investors.nrg.com/static-files/5be13ed7-14f9-476e-859a-415dbb1c4b52) — investors.nrg.com · tier other

## Data quality

- The 450-MW figure in LS Power's transaction announcements refers to the combined Rockford I and II Energy Center; the exact EIA plant covered here is Rockford I, identified separately at 316 MW with two generating units. The approximately $55 million announced purchase price and $56 million of reported cash proceeds relate to the 2016 Rockford sale transaction and are not an allocated value for Rockford I alone. The approximately $12.0 billion enterprise value, assumed debt, and acquisition financing described for the January 2026 NRG-LS Power transaction are portfolio-level figures, not project-level financing for Rockford I. The available plant record continues to identify Rockford I as an operating 316-MW facility; no separate retirement, uprate, expansion, or repowering milestone is identified for this exact plant.

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