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Chuja Island

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

CoverageDetailed public record
Named organizations6
System facts15
Sources reviewed10
Evidence reviewed2026-07-20

Chuja's record contains two different projects. A POSCO-led consortium was selected in 2015 to plan a large energy-independent-island conversion using multi-megawatt wind and solar plus storage, but contemporary POSCO and later research sources continued to describe it as site selection, design, or a proposal; no commissioning evidence for that large build was found. A separate 30 kW oscillating-water-column wave-energy microgrid with battery storage was completed at Muk-ri harbor in 2021 and remained under long-term operation and performance verification in the IEA-OES 2025 report.

Research status
The large POSCO consortium conversion should be treated as selected/planned, not verified built: POSCO ICT was still selecting a generation site in 2016, engineering papers described future conversion, and a 2019 paper still proposed an optimal Chuja microgrid. Separately, KRISO held the Muk-ri wave-energy completion ceremony in November 2021 and began trial operation; IEA-OES reported the 30 kW wave/ESS microgrid in long-term operation and performance verification during 2025.
Historical classification
Island
Reported capacity
See component specifications
Coordinates
33.96368, 126.29613
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 Chuja Island?

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

Organization

G-Philos

Partner named by KRISO for joint trial operation of the Muk-ri wave-energy microgrid. [8]

Organization

Hydrowave Power

Industry partner in trial operation of the Muk-ri wave-energy system and recipient/participant in the 2021 technology transfer described by KRISO. [8]

Organization

Jeju Special Self-Governing Province

Provincial authority for the island and source context for the proposed energy-independent-island design. [4][5]

Organization

Korea Research Institute of Ships and Ocean Engineering

Research lead for the separate Muk-ri oscillating-water-column wave-energy microgrid and its commissioning/trial operation. [8][9]

Organization

POSCO

Publicly named participant; role not specified in the recovered record [1]

Organization

POSCO ICT

Leader/participant in the consortium selected for the proposed large energy-independent-island conversion; its 2016 account shows site selection and development work rather than commissioning. [2][3]

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.

Existing island diesel system in planning studies
Approximately 5.5 MW; one detailed model represents four 1 MW and two 0.5 MW units (5 MW), illustrating source/configuration variation rather than a verified upgrade [4][5][6]
Large-conversion public plan variant
1.3 MW solar and 3.2 MW wind in a 2017 energy-independent-island presentation; estimated project cost US$46 million [4]
Large-conversion engineering-study variant
1.6 MW PV, three 800 kW wind turbines (2.4 MW), and 12 MWh BESS; this was an optimized design/model, not verified installed equipment [5][6]
Modeled renewable fraction
33.56% renewable with zero modeled loss-of-power-supply probability and 7,099 tCO2/year avoided; simulation result only [5]
Built Muk-ri wave microgrid
30 kW slope-type oscillating-water-column wave-energy converter integrated with a microgrid and ESS; public sources do not disclose ESS kW/kWh [8][9]
Muk-ri feeder/load context
A pre-commissioning control study measured 588.3 kW maximum active load and 741 kVA on the Muk-ri section; these are feeder observations, not wave-plant output [10]

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

Proposed wind generation

Model not publicly disclosed

The detailed 2017 study modeled three 800 kW turbines, 2.4 MW total. No manufacturer/model or installation evidence was located. [5]

02

Proposed solar generation

Model not publicly disclosed

The detailed design divided 1.6 MW into sixteen 100 kW PV blocks. Manufacturer and inverter model were not disclosed, and the array was not verified as built. [5]

03

Proposed battery storage

Model not publicly disclosed

A 12 MWh BESS appears in the large-project engineering model; chemistry, power rating, manufacturer, and commissioning were not established. [5][6]

04

Wave-energy converter

Model not publicly disclosed

30 kW slope-type oscillating-water-column converters incorporated into the existing Muk-ri breakwater; KRISO does not disclose the component model in the reviewed release. [8][9]

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.

  • Large-project selection and development

    The Korean government selected a POSCO consortium for Chuja in 2015. POSCO ICT's 2016 update said it was selecting the generation site and actively pursuing development, not that the system was operating. [2][3]

  • Large-project evidence boundary

    A 2016 paper expected installation by 2019, a 2017 paper said the island 'will be converted,' and a 2019 peer-reviewed paper still proposed an optimal microgrid. In the absence of a commissioning or operator record, the multi-megawatt POSCO project is not counted as built. [6][5][7]

  • Muk-ri commissioning

    KRISO held a completion ceremony on 11 November 2021 and began joint trial operation with Hydrowave Power and G-Philos after a research program dating to 2016 and technology transfer in September 2021. [8]

  • Muk-ri current result

    The IEA-OES 2025 annual report describes the 30 kW wave-energy system as integrated with a microgrid and ESS and undergoing long-term operation and performance verification. It does not publish annual MWh, availability, or storage capacity. [9]

  • Resilience objective

    A 2020 control study designed the Muk-ri wave/ESS subsystem to preserve service to Muk-ri if the rest of Chuja's diesel grid failed. Reported algorithm performance was simulated and should not be presented as observed outage performance. [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 2020-07-06

  2. [2]
  3. [3]
  4. [4]
    Eco-Friendly Energy Independent Island Solution

    LG CNS / Asian Development Bank Asia Clean Energy Forum · Primary source

  5. [5]
    Design of an optimal hybrid energy system for Chuja Island

    International Conference on Renewable Energies and Power Quality · Secondary research

  6. [6]
  7. [7]
    Optimal Microgrid Design for Chuja Island

    The Institute of Korean Electrical and Electronics Engineers · Secondary research

  8. [8]
    Completion of the wave power generation demonstration plant at Muk-ri Port, Chuja Island

    Korea Research Institute of Ships and Ocean Engineering · Primary source

  9. [9]
    Ocean Energy Systems Annual Report 2025

    International Energy Agency Ocean Energy Systems · Primary source

  10. [10]
    Operation algorithm for a wave-energy microgrid at Muk-ri, Chuja Island

    Journal of the Korean Society of Marine Environment & Safety · Secondary research

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