What Middle River Power does

Middle River Power (MRP) is a Chicago-headquartered independent power producer founded in 2016 that develops and operates Hybrid Energy Centers — facilities that pair existing natural gas peaking turbines (GE LM6000, Pratt & Whitney FT8, and Siemens equipment) with co-located lithium iron phosphate (LFP) battery energy storage systems (BESS). Its strategy is to repurpose underutilized interconnection, siting, and permitting rights at legacy peaker sites — infrastructure that is unused roughly 95% of hours per year — to bring BESS online faster and at lower cost than standalone greenfield storage. The owned/operated California portfolio includes nine hybrid centers (Colton, Vaca Dixon, Panoche, Enterprise, Border, Midway, Henrietta, Hanford, and Malaga), and MRP also manages approximately 4.8 GW of third-party generation in PJM and ERCOT (including the Heritage Power former-GenOn portfolio and Sandy Creek).

MRP monetizes the portfolio through long-term bilateral power purchase agreements (PPAs) of 12–15 years with California load-serving entities — investor-owned utilities such as PG&E, community choice aggregators including San Diego Community Power, Silicon Valley Clean Energy, Central Coast Community Energy, East Bay Community Energy, and Ava Community Energy, and municipal customers such as the City of San Jose — earning contracted capacity and energy revenue from both thermal and BESS assets. A separate, smaller revenue stream comes from fee-based asset management services sold to third-party power plant owners.

The company was acquired by Partners Group in June 2025 for a USD 2.2 billion enterprise value alongside a 1.9 GW portfolio of 11 California natural gas plants, and has since moved into adjacent product lines including a December 2025 MOU with California Resources Corporation on carbon capture and sequestration, and a February 2026 agreement to acquire a 50% interest in the 234 MW Midway-Sunset Cogeneration Company.

Name

Middle River Power

Legal name

Middle River Power, LLC

Website

https://middleriverpower.com

Company type

Private

Founded year

2016

Operating status

Operating

Headcount range

11–50 employees

Short description

Middle River Power is a Chicago-based independent power producer that develops Hybrid Energy Centers pairing natural gas peakers with co-located battery storage across California, selling 12–15 year PPAs to utilities, community choice aggregators, and municipal customers, and managing ~4.8 GW of third-party generation in PJM and ERCOT.

Ownership category

akta.pro rank

Product category

Independent Power Generation / Hybrid Energy Generation

NAICS

Electric Power Generation (22111), Electric Power Generation, Transmission and Distribution (2211)

SIC

Electric Services (4911), Cogeneration Services & Small Power Producers (4991)

akta.pro primary industry

Utility-Scale BESS Project Development & Ownership (IPP/Developer) (EUAFAAAA)

akta.pro secondary industry

Utility-Scale Power Generation Asset Management (EUAEAMAA)

Keywords

• Hybrid energy centers
• Battery energy storage
• Power purchase agreements
• Independent power producer
• Asset management services

Headquarters

HQ city

Chicago

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Infrastructure, Operations, Supply Chain, Personnel, Technology or R&D

Revenue model

1. Power Purchase Agreements (PPAs) with Utilities and CCAs: MRP generates revenue through long-term PPAs (12–15 year terms) with utilities (PG&E), community choice aggregators (San Diego Community Power, Silicon Valley Clean Energy, Central Coast Community Energy, East Bay Community Energy), and municipal customers (City of San Jose). These agreements provide contracted capacity and energy revenue from both thermal generation and BESS assets.
2. Asset Management Services: MRP provides asset management services to third-party owners of power generation assets. The company manages approximately 4.8 GWs of capacity outside of California for third parties (including Heritage Power former GenOn portfolio in Pennsylvania, Ohio, and New Jersey, and Sandy Creek in ERCOT), generating fee-based management revenue.
3. Midway-Sunset Cogeneration Company Acquisition: MRP agreed to acquire a 50% ownership interest in the Midway-Sunset Cogeneration Company (~234 MW natural gas-fired peaking facility in Kern County, CA) in February 2026, expanding its operating asset base. The facility will be co-owned with California Resources Corporation.

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

Middle River Power operates as an independent power producer developing and operating Hybrid Energy Centers that pair existing natural gas peaking facilities with co-located Lithium Iron Phosphate (BESS) battery storage systems, delivering dispatchable capacity and renewable balancing to utilities, community choice aggregators, and municipalities under 12–15 year PPAs. The company also provides fee-based third-party asset management services for approximately 4.8 GW of capacity outside California, and is developing carbon capture and sequestration (CCS) solutions at select thermal facilities in partnership with California Resources Corporation.

Product overview

Middle River Power (MRP) operates as an independent power producer offering a portfolio of Hybrid Energy Centers that combine natural gas peaking facilities with co-located Battery Energy Storage Systems (BESS). The core product consists of multiple hybrid facilities across California (Colton, Vaca Dixon, Panoche, Enterprise, Border, Midway, Henrietta, Hanford, and Malaga) that integrate gas turbine generation with grid-scale lithium-ion battery storage. These hybrid centers enable renewable energy balancing, emissions reduction, and grid reliability services. MRP also provides third-party asset management services for approximately 4.8 GW of power generation capacity and is developing carbon capture and sequestration solutions in partnership with California Resources Corporation.

Differentiator

Problem solved

Functional benefit

Products and services

• Hybrid Energy Centers
• Colton Hybrid Energy Center

Quantifiable outcome

• Reduced gas plant run-time and avoided 1,648 metric tons of CO2 at Hanford Hybrid Energy Center since BESS energization
• +2 more outcomes

Named customers7 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

Five partnerships are on record, tiered core and major.

• California Resources Corporation (CRC) / Carbon TerraVaultcoreStrategic or Co-development Partner · 16 December 2025CRC and MRP signed an MOU to develop carbon capture and sequestration (CCS) solutions at MRP power plants in California, initially targeting the High Desert plant (850 MW, up to 2.1 MMTPA CO2) and San Joaquin Energy Center (330 MW, up to 0.65 MMTPA CO2). CRC's Carbon TerraVault will serve as exclusive CO2 transportation and sequestration provider. MRP will operate the power and CO2 capture facilities. This is CRC's first MOU for a brownfield power facility in Northern California, and MRP's first major CCS partnership.
• NAES CorporationmajorTechnology or IntegrationNAES is a leading independent power plant operations and maintenance provider. MRP maintains strong relationships with experienced industry contractors and consultants including NAES to guarantee safe, reliable, and efficient operations of its generation facilities.
• Siemens EnergymajorTechnology or IntegrationSiemens is listed as a key industry partner providing equipment (turbines, generators) and related services for MRP's power generation facilities. MRP relies on Siemens and other OEM partners for equipment supply and technical support.
• General Electric (GE)majorTechnology or IntegrationGE is a key technology partner providing LM6000 aero-derivative turbines and related equipment for multiple MRP hybrid energy centers (Malaga, Midway, Hanford). GE's equipment enables high flexibility and quick start-up times for MRP's peaking facilities.
• Mitsubishi PowermajorTechnology or IntegrationMitsubishi Power is listed as a key industry partner and equipment provider supporting MRP's power generation fleet.

Scale indicators11 records

Recent moves6 records

Expansion highlights7 records

Broad incumbents

• Vistra Corp: Large publicly-traded independent power producer with significant natural gas, nuclear, coal, and battery storage capacity across CAISO, ERCOT, and PJM. Vistra operates in the same US power markets and has been actively integrating battery storage alongside its thermal fleet, making it a key broader-incumbent comparable.
• NRG Energy: Publicly-traded diversified IPP and retail electricity provider with substantial generation capacity in CAISO (including legacy gas peaker portfolio similar to MRP's) and Texas. NRG's combination of owned generation and customer-facing retail power parallels MRP's contracted PPA model plus asset management book.
• NextEra Energy Resources: Subsidiary of NextEra Energy and the world's largest generator of renewable energy from wind and solar, with growing utility-scale battery storage operations across CAISO, ERCOT, and PJM. Its scale and contracted generation portfolio represent an institutional benchmark for MRP's competitive positioning.
• ENGIE North America: North American arm of the global utility ENGIE, operating a portfolio of renewables, gas, and storage assets across the US, with significant California presence. ENGIE NA's broad portfolio and focus on clean energy integration make it a comparable incumbent in the same operating geographies.
• AES Corporation: Global IPP with one of the largest US battery storage development pipelines plus legacy thermal generation in CAISO and PJM. AES's strategic focus on integrating storage with conventional generation to serve data center and utility demand directly parallels MRP's hybridization strategy.

Direct peers

• Clearway Energy: Yieldco that owns and operates contracted renewable and conventional generation plus utility-scale battery storage across US markets. Clearway's contracted cash flow model through long-term PPAs and focus on hybrid thermal-and-storage development make it a direct comparable for MRP's revenue structure.
• Tenaska: Privately-held independent power producer and energy marketer with a portfolio of natural gas and renewable facilities across the US. Tenaska's IPP + asset management + development model parallels MRP's contracted thermal and storage business.
• Calpine Corporation: Large private IPP focused on natural-gas-fired generation, primarily in California and Texas, with growing battery storage integration. Now owned by EPM; Calpine's California-centered fleet and BESS expansion strategy most directly overlap with MRP's Hybrid Energy Center model.
• LS Power: Privately-held US power generation and storage developer/owner with a comparable portfolio of thermal, renewable, and battery assets across CAISO, ERCOT, and PJM. LS Power's hybrid generation/storage development model and PPA-driven revenue structure closely mirror MRP's Hybrid Energy Center strategy.

Emerging players

• EDF Renewables North America: US subsidiary of EDF Renewables focused on developing and operating utility-scale solar, wind, and battery storage projects, with growing activity in CAISO and ERCOT. EDF-R's storage development and PPA origination create competition for MRP's standalone BESS and hybrid energy center offtake opportunities.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Middle River Power