# MRP Rocky Road LLC PJM Natural Gas Fired Combustion Turbine · https://askthegrid.com/assets/facilities/mrp-rocky-road-llc MRP Rocky Road LLC is a natural gas-fired power facility with 374 MW of EIA-reported nameplate capacity in Kane County, Illinois, registered as EIA Plant ID 55109. The three non-out-of-service units total 374.0 MW nameplate. 932 ROCK12 KV RR-1 (32417665); 932 ROCK12 KV RR-2 (32417667); 932 ROCK12 KV RR-3 (32417669); 932 ROCK12 KV RR-4 (32417671). ## Key facts - Technology: Natural Gas Fired Combustion Turbine - Power capacity: 374 MW - Operating status: operating ## Grid and market context - ISO/RTO: PJM - Balancing authority: PJM Interconnection, LLC ## Source-backed facts - Owner logo domain: dairylandpower.com — Generation Resources | Dairyland Power Cooperative · confidence: high - Owner logo domain: dairylandpower.com — Dairyland Announces Acquisition of Assets in Illinois | Dairyland Power Cooperative · confidence: high - Identifiers: [{"value":"55109","system":"EIA plant ID"},{"value":"64030","system":"EIA operator code"},{"value":"TG1","system":"EIA generator ID"},{"value":"TG2","system":"EIA generator ID"},{"value":"TG3","system":"EIA generator ID"},{"value":"T4","system":"EIA generator ID"},{"value":"PJM Interconnection, LLC","system":"PJM balancing authority"},{"value":"32417665","system":"PJM LMP node — TG1"},{"value":"32417667","system":"PJM LMP node — TG2"},{"value":"32417669","system":"PJM LMP node — TG3"},{"value":"32417671","system":"PJM LMP node — T4"},{"value":"99-2157-00","system":"FERC exempt wholesale generator docket"},{"value":"ER23-2701-000","system":"FERC market-based-rate docket"},{"value":"ER25-3124-000","system":"FERC/PJM capacity-resource waiver docket"},{"value":"254900WEHOUCNLCZLJ45","system":"Legal Entity Identifier (LEI)"},{"value":"7599963","system":"Delaware entity ID"},{"value":"MRP Rocky Road Project","system":"PJM capacity resource/project"}] — Federal Register :: MRP Rocky Road LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: medium - Official project url: https://dairylandpower.com/generation-resources — Generation Resources | Dairyland Power Cooperative · confidence: high - Owner name: Dairyland Power Cooperative — Dairyland Announces Acquisition of Assets in Illinois | Dairyland Power Cooperative · confidence: high - Owner name: Dairyland Power Cooperative — Generation Resources | Dairyland Power Cooperative · confidence: high - Description: MRP Rocky Road LLC is an operating natural-gas-fired combustion-turbine plant at 1221 Power Drive in East Dundee, Kane County, Illinois. EIA records identify four generators—TG1, TG2, TG3, and T4—with first operation in June 1999 for TG1–TG3 and June 2000 for T4; TG3 is listed out of service. Dairyland Power Cooperative acquired the facility in 2025 and publicly refers to it as Rocky Road Energy Center. The plant is in PJM and is listed in EIA records under Lincoln Operating Services, LLC. — Dairyland Announces Acquisition of Assets in Illinois | Dairyland Power Cooperative · confidence: medium - Identifiers.12: {"value":"ER23-2701-000","system":"FERC market-based-rate docket"} — Federal Register :: MRP Rocky Road LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high - Identifiers.16: {"value":"MRP Rocky Road Project","system":"PJM capacity resource/project"} — Source · confidence: medium - Parties.0: {"relationship":"Current owner","name":"Dairyland Power Cooperative","official_url":"https://dairylandpower.com/"} — Dairyland Announces Acquisition of Assets in Illinois | Dairyland Power Cooperative · confidence: high - Parties.1: {"relationship":"Registered project entity and FERC applicant","name":"MRP Rocky Road LLC","official_url":null} — Federal Register :: MRP Rocky Road LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization · confidence: high - Parties.3: {"relationship":"Former operator and asset manager on behalf of Avenue Capital Group","name":"Middle River Power","official_url":"https://middleriverpower.com/"} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium - Parties.4: {"relationship":"Former owner and seller","name":"Avenue Capital Group","official_url":null} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high - Parties.6: {"relationship":"Historical turbine OEM — Siemens SGT6-3000E units","name":"Siemens Energy","official_url":"https://www.siemens-energy.com/"} — Power plant profile: Rocky Road Power Station, US · confidence: medium - Parties.7: {"relationship":"Historical turbine OEM — GE Power LM5000 unit","name":"GE Power","official_url":null} — Power plant profile: Rocky Road Power Station, US · confidence: medium - Site acres: 18 — Construction Begins on Rocky Road Site · confidence: medium - 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 url: https://www.siemens-energy.com/global/en/home/products-services/product-offerings/gas-turbines.html — LM500 | GE Aerospace · confidence: medium - Manufacturer domain: siemens-energy.com; geaerospace.com — ProEnergy to Continue Illinois Gas Power Plants' O&M Contracts · confidence: medium - Manufacturer name: Siemens/Westinghouse and GE Power — ProEnergy to Continue Illinois Gas Power Plants' O&M Contracts · confidence: medium - Description: MRP Rocky Road LLC is an operating natural-gas-fired combustion-turbine plant at 1221 Power Drive in East Dundee, Kane County, Illinois. EIA records list four generators totaling 415.5 MW of nameplate capacity: TG1, TG2, and T4 are operating, while TG3 is out of service. The facility was built as a greenfield simple-cycle peaking plant and was commissioned in June 1999, with T4 entering service in June 2000. Dairyland Power Cooperative acquired the Rocky Road assets and assumed certain liabilities from Avenue Capital Group on October 31, 2025; the facility is now publicly identified as Rocky Road Energy Center. — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium - Financing summary: On October 31, 2025, Dairyland Power Cooperative acquired the assets and assumed certain liabilities of Elgin Energy Center and Rocky Road Energy Center from Avenue Capital Group in an asset acquisition. Total consideration for the two facilities was $217.5 million, with $62.5 million allocated to Rocky Road and $155 million to Elgin. The combined acquisition cost including direct transaction costs was $228.210 million. The disclosed figures are purchase consideration and acquisition cost, not a separately identified Rocky Road project-financing package. — BUILDING THE BRIDGE · confidence: medium - Timeline: [{"event":"Construction","date":null,"detail":"Frank Lill & Son served as general contractor for a greenfield 260 MW gas-fired simple-cycle peaking plant in the Chicago area, using Siemens/Westinghouse 501D5A and GE LM5000 combustion-turbine technology."},{"event":"Initial commissioning and unit operation","date":"1999-06","detail":"The plant was commissioned in June 1999. EIA records list TG1 and TG2 as first operating in June 1999 and TG3 as first operating in June 1999 but currently out of service."},{"event":"Historical ownership transfer filing","date":"1999-10-07","detail":"Rocky Road Power LLC and NRG Rocky Road LLC filed a FERC Section 203 application to transfer an undivided portion of the ownership interest in Rocky Road to NRG Rocky Road LLC."},{"event":"T4 commercial operation","date":"2000-06","detail":"EIA records list generator T4, a 122.4 MW natural-gas combustion turbine, as first operating in June 2000; its record states that no uprate or derate was completed."},{"event":"Historical operator period","date":"2013","detail":"Plant records identify Rocky Road Power LLC as the previous operator from 2013 through 2019."},{"event":"Acquisition from Avenue Capital Group","date":"2025-10-31","detail":"Dairyland Power Cooperative acquired the Rocky Road Energy Center assets and assumed certain liabilities from Avenue Capital Group; $62.5 million of the combined $217.5 million consideration was allocated to Rocky Road."},{"event":"Public acquisition announcement","date":"2025-11-03","detail":"Dairyland publicly announced that it had purchased the Rocky Road facility in East Dundee and the Elgin Energy Center from Avenue Capital Group; Middle River Power had operated the plants on Avenue's behalf."},{"event":"PJM portfolio integration","date":"2025","detail":"Dairyland became a participant in the PJM Energy Market with its acquisition of natural-gas plants in Illinois, including Rocky Road."}] — Power plant profile: Rocky Road Power Station, US · confidence: medium - Timeline: [{"event":"Construction","date":null,"detail":"Frank Lill & Son served as general contractor for a greenfield 260 MW gas-fired simple-cycle peaking plant in the Chicago area, using Siemens/Westinghouse 501D5A and GE LM5000 combustion-turbine technology."},{"event":"Initial commissioning and unit operation","date":"1999-06","detail":"The plant was commissioned in June 1999. EIA records list TG1 and TG2 as first operating in June 1999 and TG3 as first operating in June 1999 but currently out of service."},{"event":"Historical ownership transfer filing","date":"1999-10-07","detail":"Rocky Road Power LLC and NRG Rocky Road LLC filed a FERC Section 203 application to transfer an undivided portion of the ownership interest in Rocky Road to NRG Rocky Road LLC."},{"event":"T4 commercial operation","date":"2000-06","detail":"EIA records list generator T4, a 122.4 MW natural-gas combustion turbine, as first operating in June 2000; its record states that no uprate or derate was completed."},{"event":"Historical operator period","date":"2013","detail":"Plant records identify Rocky Road Power LLC as the previous operator from 2013 through 2019."},{"event":"Acquisition from Avenue Capital Group","date":"2025-10-31","detail":"Dairyland Power Cooperative acquired the Rocky Road Energy Center assets and assumed certain liabilities from Avenue Capital Group; $62.5 million of the combined $217.5 million consideration was allocated to Rocky Road."},{"event":"Public acquisition announcement","date":"2025-11-03","detail":"Dairyland publicly announced that it had purchased the Rocky Road facility in East Dundee and the Elgin Energy Center from Avenue Capital Group; Middle River Power had operated the plants on Avenue's behalf."},{"event":"PJM portfolio integration","date":"2025","detail":"Dairyland became a participant in the PJM Energy Market with its acquisition of natural-gas plants in Illinois, including Rocky Road."}] — BUILDING THE BRIDGE · confidence: medium - Timeline: [{"event":"Construction","date":null,"detail":"Frank Lill & Son served as general contractor for a greenfield 260 MW gas-fired simple-cycle peaking plant in the Chicago area, using Siemens/Westinghouse 501D5A and GE LM5000 combustion-turbine technology."},{"event":"Initial commissioning and unit operation","date":"1999-06","detail":"The plant was commissioned in June 1999. EIA records list TG1 and TG2 as first operating in June 1999 and TG3 as first operating in June 1999 but currently out of service."},{"event":"Historical ownership transfer filing","date":"1999-10-07","detail":"Rocky Road Power LLC and NRG Rocky Road LLC filed a FERC Section 203 application to transfer an undivided portion of the ownership interest in Rocky Road to NRG Rocky Road LLC."},{"event":"T4 commercial operation","date":"2000-06","detail":"EIA records list generator T4, a 122.4 MW natural-gas combustion turbine, as first operating in June 2000; its record states that no uprate or derate was completed."},{"event":"Historical operator period","date":"2013","detail":"Plant records identify Rocky Road Power LLC as the previous operator from 2013 through 2019."},{"event":"Acquisition from Avenue Capital Group","date":"2025-10-31","detail":"Dairyland Power Cooperative acquired the Rocky Road Energy Center assets and assumed certain liabilities from Avenue Capital Group; $62.5 million of the combined $217.5 million consideration was allocated to Rocky Road."},{"event":"Public acquisition announcement","date":"2025-11-03","detail":"Dairyland publicly announced that it had purchased the Rocky Road facility in East Dundee and the Elgin Energy Center from Avenue Capital Group; Middle River Power had operated the plants on Avenue's behalf."},{"event":"PJM portfolio integration","date":"2025","detail":"Dairyland became a participant in the PJM Energy Market with its acquisition of natural-gas plants in Illinois, including Rocky Road."}] — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: medium - Timeline.1: {"event":"Initial commissioning and unit operation","date":"1999-06","detail":"The plant was commissioned in June 1999. EIA records list TG1 and TG2 as first operating in June 1999 and TG3 as first operating in June 1999 but currently out of service."} — Power plant profile: Rocky Road Power Station, US · confidence: medium - Timeline.5: {"event":"Acquisition from Avenue Capital Group","date":"2025-10-31","detail":"Dairyland Power Cooperative acquired the Rocky Road Energy Center assets and assumed certain liabilities from Avenue Capital Group; $62.5 million of the combined $217.5 million consideration was allocated to Rocky Road."} — BUILDING THE BRIDGE · confidence: high - Timeline.6: {"event":"Public acquisition announcement","date":"2025-11-03","detail":"Dairyland publicly announced that it had purchased the Rocky Road facility in East Dundee and the Elgin Energy Center from Avenue Capital Group; Middle River Power had operated the plants on Avenue's behalf."} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high - Timeline.7: {"event":"PJM portfolio integration","date":"2025","detail":"Dairyland became a participant in the PJM Energy Market with its acquisition of natural-gas plants in Illinois, including Rocky Road."} — BUILDING THE BRIDGE · confidence: medium - Commercial parties.0: {"relationship":"Current owner and 2025 buyer","name":"Dairyland Power Cooperative","detail":"Acquired Rocky Road from Avenue Capital Group on October 31, 2025, and publicly refers to the facility as Rocky Road Energy Center.","official_url":"https://dairylandpower.com/"} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high - Commercial parties.1: {"relationship":"Former owner and seller","name":"Avenue Capital Group","detail":"Sold the Rocky Road and Elgin assets to Dairyland Power Cooperative in the October 2025 transaction; Middle River Power operated the plants on Avenue's behalf before the sale.","official_url":"https://www.avenuecapital.com/"} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high - Commercial parties.4: {"relationship":"Former operator and asset manager","name":"Middle River Power","detail":"Operated the Rocky Road and Elgin plants on behalf of Avenue Capital Group before Dairyland's acquisition.","official_url":"https://middleriverpower.com/"} — Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative · confidence: high - Commercial parties.6: {"relationship":"Historical turbine OEM","name":"Siemens Energy","detail":"Historical Siemens/Westinghouse supplier associated with the 501D5A combustion-turbine technology used at Rocky Road; later plant profiles identify Siemens SGT6-3000E units.","official_url":"https://www.siemens-energy.com/"} — Power plant profile: Rocky Road Power Station, US · confidence: medium - Quality notes.0: Capacity figures use different reporting bases: EIA records list 415.5 MW of plant nameplate capacity, while Dairyland's acquisition accounting describes Rocky Road as a 334 MW generating station. — BUILDING THE BRIDGE · confidence: high - Quality notes.2: The documented 2025 transaction was an asset acquisition. No separate Rocky Road project-finance debt package or acquisition-financing allocation is identified in the cited accounting disclosures. — BUILDING THE BRIDGE · confidence: medium - Acquisition detail: Dairyland Power Cooperative purchased the Rocky Road facility in East Dundee, Illinois, from Avenue Capital Group as part of a transaction that also included the Elgin Energy Center. — Source · confidence: high - Acquisition date: 2025-11-03 — Source · confidence: medium - Seller: Avenue Capital Group — Source · confidence: high - Acquirer: Dairyland Power Cooperative — Source · confidence: high - Transaction scope: portfolio_includes_asset — Source · confidence: high - Status detail: The exact plant is operating in PJM. Generator-level records list TG1, TG2, and T4 as operating and TG3 as out of service. PJM capacity records identify the associated Rocky Road CT resources, and Dairyland lists Rocky Road Energy Center as acquired in 2025. No Rocky Road-specific retirement, closure, seasonal-operation, or repowering date was identified; the reported June 1 retirement discussion applied to the separate Elgin Energy Center. — Generation Resources | Dairyland Power Cooperative · confidence: medium - Operating status: operating — Generation Resources | Dairyland Power Cooperative · confidence: high ## Timeline - 2025-11-03 — Public acquisition announcement Dairyland publicly announced that it had purchased the Rocky Road facility in East Dundee and the Elgin Energy Center from Avenue Capital Group; Middle River Power had operated the plants on Avenue's behalf. Source: Dairyland Announces Acquisition of Natural Gas Assets in Illinois | Dairyland Power Cooperative (https://dairylandpower.com/dairyland-announces-acquisition-natural-gas-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 Rocky Road LLC; Supplemental Notice That Initial Market-Based Rate Filing Includes Request for Blanket Section 204 Authorization](https://www.federalregister.gov/documents/2023/08/31/2023-18851/mrp-rocky-road-llc-supplemental-notice-that-initial-market-based-rate-filing-includes-request-for) — federalregister.gov · tier regulatory - [Source](https://www.monitoringanalytics.com/filings/2025/IMM_Protest_Waiver_Request_Docket_No_ER25-3124_20250908.pdf) — monitoringanalytics.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 - [Power plant profile: Rocky Road Power Station, US](https://www.power-technology.com/data-insights/power-plant-profile-rocky-road-power-station-us/) — power-technology.com · tier other - [Construction Begins on Rocky Road Site](https://www.power-eng.com/operations-maintenance/construction-begins-on-rocky-road-site/) — power-eng.com · tier other - [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 - [LM500 | GE Aerospace](https://www.geaerospace.com/military-defense/engines/lm500) — geaerospace.com · tier other - [ProEnergy to Continue Illinois Gas Power Plants' O&M Contracts](https://www.power-eng.com/gas/turbines/proenergy-to-continue-illinois-gas-power-plants-o-m-contracts/) — power-eng.com · tier other - [BUILDING THE BRIDGE](https://dairylandpower.com/sites/default/files/PDFs/Annual%20Reports/DPC_AnnualReport2025-WEB.pdf) — dairylandpower.com · tier other - [Sheet1](https://www.pjm.com/-/media/DotCom/markets-ops/energy/day-ahead/valid-bidding-locations-for-virtual-bids.xls) — pjm.com · tier other - [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/) — utilitydive.com · tier other ## Data quality - Capacity figures use different reporting bases: EIA records list 415.5 MW of plant nameplate capacity, while Dairyland's acquisition accounting describes Rocky Road as a 334 MW generating station. The EIA-listed total includes TG3, a 41.5 MW unit recorded as out of service; T4's record states that no uprate or derate was completed. The documented 2025 transaction was an asset acquisition. No separate Rocky Road project-finance debt package or acquisition-financing allocation is identified in the cited accounting disclosures. --- Canonical page: https://askthegrid.com/assets/facilities/mrp-rocky-road-llc Source: Ask the Grid — https://askthegrid.com/