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Asia / Industrial & mining

F-Grid Project at Toyota Plant in Tohoku Area, Japan

Current status, energy mix, organizations, suppliers, equipment, controls, reported specifications, and project updates—with source-level citations.

CoverageDetailed public record
Named organizations16
System facts26
Sources reviewed10
Evidence reviewed2026-07-20

F-Grid Miyagi-Ohira is a factory-centered smart-community energy system in the Second North Sendai Central Industrial Area at Ohira Village, Miyagi Prefecture. Since 2013 it has combined utility purchases, a 7.8 MW city-gas cogeneration plant, solar, reused vehicle batteries, private distribution, heat delivery, and a community energy-management system across participating factories, with an emergency pathway to the Ohira Village disaster-management office.

Research status
Operating program. Toyota still publishes a current F-Grid LLP business sheet and profiled continuing F-Grid leadership activity in December 2024. No recent annual generation, fuel-use, emissions, outage, or availability statistics were found through July 2026.
Historical classification
Building
Reported capacity
See component specifications
Coordinates
35.82117, 139.57185
Evidence note: “Every company” cannot be proven from public material alone. This page lists every organization found in the recovered record and reviewed sources, preserves unknown roles, and explicitly marks undisclosed controller or equipment details.
Report missing evidenceResearch methodology

Project delivery

Who was involved in F-Grid Project at Toyota Plant in Tohoku Area, Japan?

16 publicly identified organizations. Where a recovered source named a participant without explaining its work, the role remains explicitly unspecified.

Organization

Central Motor Wheel Tohoku Co., Ltd.

Participating industrial load [3]

Organization

F-Grid Miyagi-Ohira Limited Liability Partnership

Owner/operator entity that supplies electricity and heat, manages shared energy assets, and provides emergency power [4][7]

Organization

Gas Bureau, City of Sendai

LLP member and city-gas supplier supporting cogeneration [4][9]

Organization

Ohira Village

Neighboring public beneficiary; the village office/disaster-management center can receive emergency electricity from F-Grid [4][9]

Organization

Sendai City Gas Bureau

City-gas supplier [3]

Organization

Skylark Co., Ltd.

LLP member and electricity customer for a food-production/cold-storage facility [4][9]

Organization

Tohoku Electric Power Co., Inc.

1.1% LLP member, supplying grid power and enabling emergency transfer over the utility network to Ohira Village [4][9]

Organization

Toyota Boshoku Tohoku Corporation

Participating industrial load [3]

Organization

Toyota Boshoku Tohoku Corporation, Toyota Transportation Co., Ltd., Central Motor Wheel Co., Ltd., and Vuteq Corporation

Industrial members of the current 11-company LLP, each listed with a 0.1% interest [4]

Organization

Toyota Motor Corporation

26.4% LLP member and program leader/representative in Toyota's current business sheet [4][5]

Organization

Toyota Motor East Japan, Inc.

61.2% majority LLP member, industrial host, major electric/steam customer, and administrative/operating base [4]

Organization

Toyota Transportation Corporation

Participating business [3]

Organization

Toyota Tsusho Corporation

10.6% LLP member involved in the shared industrial energy business [4]

Organization

VEGi-Dream Kurihara Corporation

LLP member and greenhouse customer receiving electricity and recovered hot water [4][9]

Organization

Vuteq Corporation

Participating industrial load [3]

Organization

Yokogawa Solution Service Corporation

Developer, integrator, and supplier of the community energy-management system that became fully operational in 2015 [7][8]

System evidence

Energy mix, capacity, and specifications

Values can describe different project phases, generation sources, storage systems, or other components. Source citations are attached to each figure so discrepancies remain visible.

KW Solar
700 [1]
KW Gas/Diesel
7800 [1]
Storage
50 [1]
Archived solar PV
700 kW [1]
Archived gas/diesel generation
7.8 MW [1]
Reused Prius storage
30 kW and 20 kW battery charging systems [3]
Vehicle power
Eight plug-in hybrid vehicles, each capable of 100 V / 1,500 W output [3]
Emergency export
Up to 1,500 kW of unused generation available to the surrounding area [3]
Current gas cogeneration rating
7,800 kW [4][7]
Current solar rating
740 kW in Toyota's current business sheet; early operating material reported about 700 kW, indicating a dated configuration difference [4][6]
Reused-battery power
90 kW in Toyota's current business sheet; the original launch configuration was 50 kW split between 30 kW and 20 kW reused Prius-battery systems. Energy capacity and duration were not published. [4][6]
Emergency community supply
Up to 1.5 MW can be sent to the Ohira Village office/disaster-management center through the emergency arrangement described at launch [6][9]
Mobile emergency resources
Original design included eight plug-in hybrid vehicles, each able to provide 100 V / 1.5 kW auxiliary output [6]
Capital and membership
Toyota's current sheet lists ¥948 million capital and 11 members; the February 2013 establishment release listed ¥946 million and 10 initial legal entities, a dated formation-to-current change [4][5]

Controls and hardware

Equipment and controller details

Manufacturer and model are shown only when a source names them. Generic descriptions are not converted into guessed product assignments.

01

Community controls

Community Energy Management System (CEMS)

Balances private generation, participating facilities, storage, vehicles, and external-grid exchange; Toyota did not disclose a separate controller vendor/model. [3]

02

Stationary storage

Toyota

Two charging/storage systems using reused Prius nickel-metal-hydride batteries, rated 30 kW and 20 kW. [3]

03

Community energy-management system

Yokogawa Solution Service Corporation

CEMS predicts factory energy demand, captures electricity/steam demand and tariff data, and calculates optimal cogeneration output versus utility purchases. The public case does not name a specific Yokogawa product model. [8][7]

04

Stationary storage

Toyota

Reused nickel-metal-hydride batteries from Prius vehicles; current aggregate power is 90 kW, but chemistry detail, energy capacity, pack count, and current converter models were not disclosed in the reviewed current sheet. [4][6]

05

Gas cogeneration

Model not publicly disclosed

A 7.8 MW city-gas engine cogeneration plant supplies electricity and recovered steam/hot water. Manufacturer, engine model, thermal rating, and heat-to-power ratio were not found in the reviewed public sources. [4][8]

Technical record

Architecture, performance, and project updates

Concise technical facts, milestones, operating results, and later developments. Dated notes distinguish historical design claims from current evidence.

  • Architecture

    The CEMS coordinates utility electricity, gas cogeneration, solar generation, shared private/self-operated lines, and factory energy-management systems. It also dispatches recovered steam to the vehicle plant and hot water to the greenhouse. [4][8]

  • Controls and demand response

    Yokogawa's system forecasts each factory's demand, develops cogeneration and purchase schedules, and created a framework for member factories to participate voluntarily in energy sharing and future demand-response coordination. [7][8]

  • Demonstration performance

    Yokogawa reports that the April 2013-March 2015 demonstration reduced costs by 20% compared with the prior baseline. This is a supplier case-study result; no independent measurement protocol was found. [8]

  • Heat-use update

    Toyota's community account says recovered heat supports year-round paprika production and reduced the greenhouse's fuel spending to roughly half that of the operator's comparable farms. [9]

  • Timeline

    The LLP was established February 28, 2013; energy operations began in April 2013; the Yokogawa CEMS completed a two-year field demonstration and was declared fully operational in July 2015. [5][6][7]

  • Location correction

    The project is in Ohira Village, Kurokawa District, Miyagi Prefecture, in the Second North Sendai Central Industrial Area—not Niiza, Saitama. [4][7]

  • Current evidence and gap

    Toyota's current business sheet and December 2024 personnel profile support continued organizational activity, but no recent annual production, renewable fraction, CHP efficiency, emissions reduction, outage performance, or battery state-of-health data were located. [4][10]

Provenance

10 sources

Primary owner, government, university, supplier, and engineering sources are preferred. Archived references preserve claims whose original pages moved or disappeared.

  1. [1]
    Recovered Microgrid Projects record

    Internet Archive · Archived source · captured 2021-04-20

  2. [2]
    MicroGrids in Japan

    google.com · Archived source · captured 2021-04-20

  3. [3]
    F-Grid system begins operation in Miyagi Prefecture

    Toyota Motor Corporation · Primary source

  4. [4]
  5. [5]
  6. [6]
    F-Grid System Begins Operation in Miyagi Prefecture

    Toyota Motor Corporation · Primary source

  7. [7]
  8. [8]
  9. [9]
    The F-grid Concept

    Toyota Motor Corporation · Primary source

  10. [10]

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