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Asia / Island & remote community

Nushima Island DC Microgrid

Organizations, planners, suppliers, equipment, controls, and reported system specifications—with source-level citations.

CoverageDetailed public record
Named organizations10
System facts10
Sources reviewed5
Last researched2026-07-19

The Nushima project was a 2012–2014 Japanese government-funded DC microgrid demonstration led by Kobe University. A 360 V DC bus integrated PV, wind, stationary and mobile batteries, direct-DC appliances, converter-fed AC loads, ship-to-grid capability, and demand-response experiments.

Research status
Research demonstration completed after the 2012–2014 funded period
Historical classification
DC
Reported capacity
See component specifications
Coordinates
34.46409, 133.97097
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 Nushima Island DC Microgrid?

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

Organization

Fuji Electric Co., Ltd.

Power and controls industry partner [3]

Organization

Hyogo Prefectural Institute of Technology

Applied research partner [3]

Organization

Keitsushin Technology Industry Co., Ltd.

Industry partner [3]

Organization

Kobe University

Lead research institution [3][4]

Organization

Ministry of the Environment, Japan

Technology-development and demonstration funder [3]

Organization

Nakanishi Metal Works Co., Ltd.

Industry partner [3]

Organization

Osaka City University

Research partner [3]

Organization

Ritsumeikan University

Research partner [3]

Organization

Sansha Electric Manufacturing Co., Ltd.

Power-electronics partner [3]

Organization

Sanyo Electric Co., Ltd.

Industry and equipment-development partner [3]

System evidence

Reported capacity and specifications

Values can describe different project phases or components. Source citations are attached to each figure so discrepancies remain visible.

KW Solar
1 [1]
KW Wind
1 [1]
Storage
1 [1]
DC bus
360 VDC [4]
Solar PV
8 kW in the published demonstration description [5]
Wind generation
1 kW [5]
Battery storage
46 kWh in the published demonstration description [5]
Reported outcome
Approximately 30% reduction in electricity consumption using DC conversion and demand-response measures [3]

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

DC energy-management controls

Model not publicly disclosed

Controls battery charge/discharge from total power balance and state of charge across a 360 VDC bus; no commercial controller model is identified. [4]

02

Power conversion

Model not publicly disclosed

High-frequency-link DC/DC converters, sinusoidal PWM DC/AC inverter, AC/DC grid interface, and converters for stationary/mobile batteries and ship charging. [4][3]

Provenance

5 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 2020-07-06

  2. [2]
    http://microgrid-symposiums.org/wp-content/uploads/2015/09/a-Tamaki_20150819.pdf

    microgrid-symposiums.org · Archived source · captured 2020-07-06

  3. [3]
    Nushima stand-alone distributed energy demonstration using DC technology

    Hyogo Prefectural Institute of Technology · Primary source

  4. [4]
  5. [5]
    Common DC bus integration — Nushima Island case

    IET Smart Grid · Secondary research

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