# MRP Elgin LLC

PJM Natural Gas Fired Combustion Turbine · https://askthegrid.com/assets/facilities/mrp-elgin-llc

MRP Elgin LLC is a natural gas-fired power facility with 540 MW of EIA-reported nameplate capacity in Cook County, Illinois, registered as EIA Plant ID 55438. The plant's generating configuration is four natural-gas-fired generating units in a combustion-turbine configuration. The plant began commercial operation in 2002.
PJM LMP node 960; unit location designations ELGI13.5 KV EE-1, EE-2, EE-3, and EE-4 · 138 kV · Commonwealth Edison Co (ComEd).

## Key facts

- Technology: Natural Gas Fired Combustion Turbine
- Power capacity: 540 MW
- Commercial operation: 2002
- Operating status: operating

## Grid and market context

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

## Source-backed facts

- Owner logo domain: dairylandpower.com — Generation Resources | Dairyland Power Cooperative · confidence: medium
- Owner logo domain: dairylandpower.com — Dairyland Announces Acquisition of Assets in Illinois · confidence: medium
- Owner name: Dairyland Power Cooperative — Dairyland Announces Acquisition of Assets in Illinois · confidence: medium
- Description: MRP Elgin LLC is a 540-MW natural-gas power plant in Elgin, Illinois, also identified in FERC records as Elgin Energy Center LLC. FERC asset records list four generating units, CT01 through CT04, under EIA plant code 55438 in the PJM market. Dairyland Power Cooperative acquired Elgin Energy Center in 2025. — Generation Resources | Dairyland Power Cooperative · confidence: medium
- Parties: [{"relationship":"Current owner","name":"Dairyland Power Cooperative","official_url":"https://dairylandpower.com/"},{"relationship":"Plant operator","name":"Lincoln Operating Services, LLC","official_url":null},{"relationship":"FERC generation-asset entity","name":"Elgin Energy Center LLC","official_url":null},{"relationship":"EIA plant / FERC market-based-rate applicant","name":"MRP Elgin LLC","official_url":null},{"relationship":"Previous operator","name":"Middle River Power","official_url":"https://middleriverpower.com/"},{"relationship":"Previous owner / seller","name":"Avenue Capital Group","official_url":null}] — Dairyland Announces Acquisition of Assets in Illinois · confidence: medium
- Parties: [{"relationship":"Current owner","name":"Dairyland Power Cooperative","official_url":"https://dairylandpower.com/"},{"relationship":"Plant operator","name":"Lincoln Operating Services, LLC","official_url":null},{"relationship":"FERC generation-asset entity","name":"Elgin Energy Center LLC","official_url":null},{"relationship":"EIA plant / FERC market-based-rate applicant","name":"MRP Elgin LLC","official_url":null},{"relationship":"Previous operator","name":"Middle River Power","official_url":"https://middleriverpower.com/"},{"relationship":"Previous owner / seller","name":"Avenue Capital Group","official_url":null}] — Federal Register :: MRP Elgin LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Parties: [{"relationship":"Current owner","name":"Dairyland Power Cooperative","official_url":"https://dairylandpower.com/"},{"relationship":"Plant operator","name":"Lincoln Operating Services, LLC","official_url":null},{"relationship":"FERC generation-asset entity","name":"Elgin Energy Center LLC","official_url":null},{"relationship":"EIA plant / FERC market-based-rate applicant","name":"MRP Elgin LLC","official_url":null},{"relationship":"Previous operator","name":"Middle River Power","official_url":"https://middleriverpower.com/"},{"relationship":"Previous owner / seller","name":"Avenue Capital Group","official_url":null}] — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium
- Identifiers.7: {"value":"ER23-2699-000","system":"FERC market-based-rate docket"} — Federal Register :: MRP Elgin LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high
- Identifiers.10: {"value":"254900HC1X6XZSA2V393","system":"Legal Entity Identifier (LEI)"} — MRP ELGIN LLC - LEI: 254900HC1X6XZSA2V393 · confidence: high
- Parties.0: {"relationship":"Current owner","name":"Dairyland Power Cooperative","official_url":"https://dairylandpower.com/"} — Dairyland Announces Acquisition of Assets in Illinois · confidence: high
- Parties.3: {"relationship":"EIA plant / FERC market-based-rate applicant","name":"MRP Elgin LLC","official_url":null} — Federal Register :: MRP Elgin LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium
- Parties.4: {"relationship":"Previous operator","name":"Middle River Power","official_url":"https://middleriverpower.com/"} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium
- Parties.5: {"relationship":"Previous owner / seller","name":"Avenue Capital Group","official_url":null} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high
- Product url: https://www.siemens-energy.com/global/en/home/products-services/product-offerings/gas-turbines.html — Aeroderivative, Industrial and Heavy-Duty Gas Turbines · confidence: medium
- Product family: W501D5A — STP_OM PanelArt · confidence: medium
- Significance: MRP Elgin is a four-unit, natural-gas-fired simple-cycle peaking plant interconnected to PJM. Its planned June 2025 retirement was withdrawn in September 2024, preserving the plant as a 540-MW PJM resource. — GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital · confidence: medium
- Description: MRP Elgin LLC is a natural-gas-fired, four-unit simple-cycle peaking plant in Elgin, Cook County, Illinois, identified in federal records as Elgin Energy Center LLC and EIA plant 55438. The facility began commercial operation in fall 2002 and sells energy and capacity into PJM. Rockland Capital acquired it from an Ameren subsidiary in January 2014; Middle River Power later operated it for Avenue Capital Group, and Dairyland Power Cooperative purchased Elgin Energy Center from Avenue in November 2025. Middle River Power withdrew a proposed June 1, 2025 retirement in September 2024. — Source · confidence: medium
- Description: MRP Elgin LLC is a natural-gas-fired, four-unit simple-cycle peaking plant in Elgin, Cook County, Illinois, identified in federal records as Elgin Energy Center LLC and EIA plant 55438. The facility began commercial operation in fall 2002 and sells energy and capacity into PJM. Rockland Capital acquired it from an Ameren subsidiary in January 2014; Middle River Power later operated it for Avenue Capital Group, and Dairyland Power Cooperative purchased Elgin Energy Center from Avenue in November 2025. Middle River Power withdrew a proposed June 1, 2025 retirement in September 2024. — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium
- Description: MRP Elgin LLC is a natural-gas-fired, four-unit simple-cycle peaking plant in Elgin, Cook County, Illinois, identified in federal records as Elgin Energy Center LLC and EIA plant 55438. The facility began commercial operation in fall 2002 and sells energy and capacity into PJM. Rockland Capital acquired it from an Ameren subsidiary in January 2014; Middle River Power later operated it for Avenue Capital Group, and Dairyland Power Cooperative purchased Elgin Energy Center from Avenue in November 2025. Middle River Power withdrew a proposed June 1, 2025 retirement in September 2024. — Middle River Power reverses plan to shut 540-MW plant amid record PJM capacity prices | Utility Dive · confidence: medium
- Financing summary: On 2014-04-08, GE Energy Financial Services provided Rockland Capital with a $50 million senior secured term loan, used in part to finance Rockland's acquisition of Elgin and related fees and expenses. Rockland's acquisition was the first investment of Rockland Power Partners II, a $425 million fund closed in December 2013; that fund size was not Elgin's purchase price. In the 2023 Lincoln Power bankruptcy process, reporting stated that Middle River Power was set to pay approximately $26.3 million for the power plants, a reported two-plant sale figure rather than project financing. No Elgin-specific purchase price was disclosed for Dairyland's November 2025 purchase from Avenue Capital Group. — GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital · confidence: medium
- Financing summary: On 2014-04-08, GE Energy Financial Services provided Rockland Capital with a $50 million senior secured term loan, used in part to finance Rockland's acquisition of Elgin and related fees and expenses. Rockland's acquisition was the first investment of Rockland Power Partners II, a $425 million fund closed in December 2013; that fund size was not Elgin's purchase price. In the 2023 Lincoln Power bankruptcy process, reporting stated that Middle River Power was set to pay approximately $26.3 million for the power plants, a reported two-plant sale figure rather than project financing. No Elgin-specific purchase price was disclosed for Dairyland's November 2025 purchase from Avenue Capital Group. — Middle River Power reverses plan to shut 540-MW plant... · confidence: medium
- Financing summary: On 2014-04-08, GE Energy Financial Services provided Rockland Capital with a $50 million senior secured term loan, used in part to finance Rockland's acquisition of Elgin and related fees and expenses. Rockland's acquisition was the first investment of Rockland Power Partners II, a $425 million fund closed in December 2013; that fund size was not Elgin's purchase price. In the 2023 Lincoln Power bankruptcy process, reporting stated that Middle River Power was set to pay approximately $26.3 million for the power plants, a reported two-plant sale figure rather than project financing. No Elgin-specific purchase price was disclosed for Dairyland's November 2025 purchase from Avenue Capital Group. — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium
- Commercial parties.0: {"relationship":"Current owner","name":"Dairyland Power Cooperative","detail":"Purchased Elgin Energy Center from Avenue Capital Group in November 2025 and lists the facility among its acquired natural-gas generation resources.","official_url":"https://dairylandpower.com/"} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high
- Commercial parties.2: {"relationship":"Previous operator and owner platform","name":"Middle River Power","detail":"Operated Elgin and Rocky Road on behalf of Avenue Capital Group and recorded its acquisition of Elgin and Rocky Road in November 2023.","official_url":"https://middleriverpower.com/"} — Middle River Power | Leading the Energy Transition · confidence: medium
- Commercial parties.3: {"relationship":"Previous owner and seller","name":"Avenue Capital Group","detail":"Owned the portfolio operated by Middle River Power and sold Elgin Energy Center to Dairyland Power Cooperative in 2025.","official_url":"https://www.avenuecapital.com/"} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high
- Commercial parties.7: {"relationship":"Acquisition lender","name":"GE Energy Financial Services","detail":"Provided Rockland Capital with a $50 million senior secured term loan in April 2014 to support the Elgin acquisition and related expenses.","official_url":"https://www.gevernova.com/financial-services"} — GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital · confidence: medium
- Commercial parties.8: {"relationship":"Operations and maintenance provider","name":"ProEnergy Services","detail":"Provided operations and maintenance services for Elgin according to the 2014 acquisition-financing announcement.","official_url":"https://www.proenergyservices.com/"} — GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital · confidence: medium
- Commercial parties.9: {"relationship":"Energy management provider","name":"Tenaska Power Services","detail":"Provided additional energy management services for Elgin according to the 2014 acquisition-financing announcement.","official_url":"https://www.tenaska.com/"} — GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital · confidence: high
- Commercial parties.10: {"relationship":"Predecessor owner in bankruptcy-sale process","name":"Lincoln Power LLC","detail":"Owned the Elgin and Rocky Road plants before Middle River Power's subsequent acquisition associated with the Lincoln Power bankruptcy process.","official_url":null} — Lincoln Power files for bankruptcy after $38.9M PJM... · confidence: medium
- Commercial parties.10: {"relationship":"Predecessor owner in bankruptcy-sale process","name":"Lincoln Power LLC","detail":"Owned the Elgin and Rocky Road plants before Middle River Power's subsequent acquisition associated with the Lincoln Power bankruptcy process.","official_url":null} — Middle River Power reverses plan to shut 540-MW plant... · confidence: medium
- Timeline.0: {"event":"Construction announced","date":"2001","detail":"Ameren announced that construction of Elgin Energy Center would begin on August 1, with part of the plant expected to be operational in 2002."} — Elgin peaker OKd with little fanfare · confidence: medium
- Timeline.1: {"event":"Commercial operation","date":"2002","detail":"The plant began commercial operation in fall 2002. FERC records show CT01 entering service in September, CT02 and CT03 in October, and CT04 in November; the facility was configured with four simple-cycle natural-gas combustion turbines."} — ILLINOIS POLLUTION CONTROL BOARD · confidence: high
- Timeline.1: {"event":"Commercial operation","date":"2002","detail":"The plant began commercial operation in fall 2002. FERC records show CT01 entering service in September, CT02 and CT03 in October, and CT04 in November; the facility was configured with four simple-cycle natural-gas combustion turbines."} — Source · confidence: high
- Timeline.4: {"event":"Acquisition financing","date":"2014-04-08","detail":"GE Energy Financial Services announced a $50 million senior secured term loan to Rockland Capital to help finance the Elgin acquisition and related fees and expenses."} — GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital · confidence: high
- Timeline.5: {"event":"Middle River Power acquisition","date":"2023-11","detail":"Middle River Power's corporate timeline records its acquisition of Elgin and Rocky Road in Illinois in November 2023. Lincoln Power was identified as the owner of the Elgin and Rocky Road plants earlier in 2023, and later reporting connected the acquisition to the Lincoln Power bankruptcy process."} — Middle River Power | Leading the Energy Transition · confidence: medium
- Timeline.6: {"event":"Retirement plan withdrawn","date":"2024-09-10","detail":"Middle River Power withdrew its proposed retirement of the 540-MW Elgin Energy Center, reversing a plan that would have retired the plant by June 1, 2025."} — Middle River Power reverses plan to shut 540-MW plant amid record PJM capacity prices | Utility Dive · confidence: high
- Timeline.8: {"event":"Acquisition by Dairyland Power Cooperative","date":"2025-11-03","detail":"Dairyland Power Cooperative announced that it had purchased Elgin Energy Center from Avenue Capital Group. The announcement establishes November 2025 as the disclosed transaction month, but does not state a purchase price."} — Dairyland Announces Acquisition of Natural Gas Assets in... · confidence: medium
- Timeline.9: {"event":"Ownership confirmed by Dairyland","date":"2026-03-06","detail":"Dairyland stated that it owns Elgin Energy Center in Elgin."} — Dairyland Announces Acquisition of Assets in Illinois | Dairyland Power Cooperative · confidence: high
- Quality notes.1: The disclosed $2.2 billion Avenue Capital transaction was portfolio-level and involved 11 plants; it should not be treated as Elgin-specific purchase consideration. Dairyland's November 2025 announcement identifies the buyer and seller but does not disclose an Elgin-specific price. — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium
- Quality notes.2: The original configuration is four simple-cycle combustion turbines. No separate expansion or repowering milestone is identified, and a plant record states that no uprate or derate had been completed. — Source · confidence: medium
- Status date: 2026-08-02 — Protest of the Independent Market Monitor for PJM · confidence: medium
- Status detail: The exact plant is operating, with CT01 through CT04 individually listed as operating. PJM records state that MRP Elgin withdrew its intent to deactivate and retire all four units in September 2024; a 2025 PJM market-monitor filing identifies the facility as a PJM capacity resource. No currently applicable whole-plant or unit retirement date is identified. — Elgin Deactivation Withdrawal · confidence: medium
- Grid role: PJM capacity resource with four natural-gas combustion-turbine units; FERC EQR data labels the associated service as peaking. — Protest of the Independent Market Monitor for PJM · confidence: medium
- Operating status: operating — Elgin Deactivation Withdrawal · confidence: medium

## Timeline

- 2001 — Construction announced
  Ameren announced that construction of Elgin Energy Center would begin on August 1, with part of the plant expected to be operational in 2002.
  Source: Elgin peaker OKd with little fanfare (https://www.chicagotribune.com/2001/05/25/elgin-peaker-okd-with-little-fanfare/)
- 2002 — Commercial operation
  The plant began commercial operation in fall 2002. FERC records show CT01 entering service in September, CT02 and CT03 in October, and CT04 in November; the facility was configured with four simple-cycle natural-gas combustion turbines.
  Source: GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital (https://rocklandcapital.com/ge-unit-provides-50-million-loan-for-elgin-energy-center/)
- 2013-12 — Rockland Power Partners II fund close
  Rockland Power Partners II, the investment fund associated with the subsequent Elgin acquisition, closed with $425 million of capital.
  Source: GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital (https://rocklandcapital.com/ge-unit-provides-50-million-loan-for-elgin-energy-center/)
- 2014-04-08 — Acquisition financing
  GE Energy Financial Services announced a $50 million senior secured term loan to Rockland Capital to help finance the Elgin acquisition and related fees and expenses.
  Source: GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital (https://rocklandcapital.com/ge-unit-provides-50-million-loan-for-elgin-energy-center/)
- 2023-11 — Middle River Power acquisition
  Middle River Power's corporate timeline records its acquisition of Elgin and Rocky Road in Illinois in November 2023. Lincoln Power was identified as the owner of the Elgin and Rocky Road plants earlier in 2023, and later reporting connected the acquisition to the Lincoln Power bankruptcy process.
  Source: Middle River Power | Leading the Energy Transition (https://middleriverpower.com/)
- 2024-09-10 — Retirement plan withdrawn
  Middle River Power withdrew its proposed retirement of the 540-MW Elgin Energy Center, reversing a plan that would have retired the plant by June 1, 2025.
  Source: Middle River Power reverses plan to shut 540-MW plant amid record PJM capacity prices | Utility Dive (https://www.utilitydive.com/news/middle-river-power-retire-elgin-power-plant-pjm-interconnection/726824/)
- 2025-08-19 — FERC Section 203 filing
  MRP Elgin LLC and MRP Rocky Road LLC filed a joint application for authorization under Section 203 of the Federal Power Act.
  Source: Federal Register :: Combined Notice of Filings #1 (https://federalregister.gov/documents/2025/08/26/2025-16317/combined-notice-of-filings-1)
- 2026-03-06 — Ownership confirmed by Dairyland
  Dairyland stated that it owns Elgin Energy Center in Elgin.
  Source: Dairyland Announces Acquisition of Assets in Illinois | Dairyland Power Cooperative (https://dairylandpower.com/dairyland-announces-acquisition-assets-illinois)

## Sources

- [Generation Resources | Dairyland Power Cooperative](https://dairylandpower.com/generation-resources) — dairylandpower.com · tier other
- [Dairyland Announces Acquisition of Assets in Illinois | Dairyland Power Cooperative](https://dairylandpower.com/dairyland-announces-acquisition-assets-illinois) — dairylandpower.com · tier other
- [Federal Register :: MRP Elgin LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2023/08/31/2023-18862/mrp-elgin-llc-supplemental-notice-that-initial-market-based-rate-filing-includes-request-for-blanket) — federalregister.gov · tier regulatory
- [MRP ELGIN LLC - LEI: 254900HC1X6XZSA2V393](https://lei.bloomberg.com/leis/view/254900HC1X6XZSA2V393) — lei.bloomberg.com · tier other
- [Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative](https://dairylandpower.com/dairyland-announces-acquisition-natural-gas-assets-illinois) — dairylandpower.com · tier other
- [ILLINOIS POLLUTION CONTROL BOARD](https://pcb.illinois.gov/documents/dsweb/Get/Rendition-122757/index.htm) — pcb.illinois.gov · tier regulatory
- [Aeroderivative, Industrial and Heavy-Duty Gas Turbines](https://www.siemens-energy.com/global/en/home/products-services/product-offerings/gas-turbines.html) — siemens-energy.com · tier other
- [STP_OM PanelArt](https://stpowerservices.com/wp-content/uploads/2020/08/STP_OM-PanelArt.pdf) — stpowerservices.com · tier other
- [Middle River Power reverses plan to shut 540-MW plant ...](https://www.utilitydive.com/news/middle-river-power-retire-elgin-power-plant-pjm-interconnection/726824/) — utilitydive.com · tier other
- [GE Unit Provides $50 Million Loan for Elgin Energy Center – Rockland Capital](https://rocklandcapital.com/ge-unit-provides-50-million-loan-for-elgin-energy-center/) — rocklandcapital.com · tier other
- [Source](https://www.sec.gov/Archives/edgar/data/783325/000010781504000107/wec10-k03.htm) — sec.gov · tier regulatory
- [Elgin peaker OKd with little fanfare](https://www.chicagotribune.com/2001/05/25/elgin-peaker-okd-with-little-fanfare/) — chicagotribune.com · tier other
- [Middle River Power | Leading the Energy Transition](https://middleriverpower.com/) — middleriverpower.com · tier other
- [Federal Register :: Combined Notice of Filings #1](https://federalregister.gov/documents/2025/08/26/2025-16317/combined-notice-of-filings-1) — federalregister.gov · tier regulatory
- [Lincoln Power files for bankruptcy after $38.9M PJM ...](https://www.utilitydive.com/news/lincoln-power-nautilus-power-ferc-pjm-penalties-elliott-complaint/646615/) — utilitydive.com · tier other
- [Protest of the Independent Market Monitor for PJM](https://www.monitoringanalytics.com/filings/2025/IMM_Protest_Waiver_Request_Docket_No_ER25-3124_20250908.pdf) — monitoringanalytics.com · tier other
- [Elgin Deactivation Withdrawal](https://www.pjm.com/-/media/DotCom/planning/gen-retire/deactivation-notices/elgin-deactivation-withdrawal.ashx) — pjm.com · tier other

## Data quality

- Capacity varies by source and measurement: current plant records identify 540 MW, while historical sources cite approximately 484 MW and FERC records list 489.9 MW summer and 500 MW winter ratings. The disclosed $2.2 billion Avenue Capital transaction was portfolio-level and involved 11 plants; it should not be treated as Elgin-specific purchase consideration. Dairyland's November 2025 announcement identifies the buyer and seller but does not disclose an Elgin-specific price. The original configuration is four simple-cycle combustion turbines. No separate expansion or repowering milestone is identified, and a plant record states that no uprate or derate had been completed.

---

Canonical page: https://askthegrid.com/assets/facilities/mrp-elgin-llc

Source: Ask the Grid — https://askthegrid.com/