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Mustique

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

CoverageDetailed public record
Named organizations6
System facts19
Sources reviewed7
Evidence reviewed2026-07-20

Mustique's private island utility has evolved through several distinct solar-diesel-storage phases. The 2015 DHYBRID Solar Valley project added 1 MWp PV to roughly 3 MVA average diesel generation. A later phase reached 1.5 MW PV and integrated a 500 kW/1 MWh Tesla battery. The current DHYBRID case describes an island-wide 7 MWp PV, 5.2 MW/10 MWh BESS, and 10,680 kVA diesel system under its Universal Power Platform; the 2024 EPC account also reports an 18-hour all-solar trial in May 2023.

Research status
Operating and substantially expanded. Mustique's own September 2022 update said work was underway to raise solar's share from 16% toward 70%. DHYBRID's current project pages show completed BESS Phase I (1.3 MW/2.257 MWh) and Phase II (5.2 MW/10 MWh) configurations with 7 MWp PV, while Solar Watt Systems reported the full system operating in 2024 and additional Lagoon solar construction. Exact 2026 annual renewable share, BESS chemistry/vendor for the final phase, diesel run hours, and independently audited fuel savings were not found.
Historical classification
Island
Reported capacity
3,000 kW
Coordinates
12.87994, -61.18402
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 Mustique?

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

Organization

ACI Engineering

Engineering collaborator on the expanded solar-storage-diesel system. [7]

Organization

DHYBRID Gmbh

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

Organization

DHYBRID Power Systems

Original hybrid-system integrator; supplier of the Fuel Reduction System, Universal Power Platform, SCADA/monitoring, and later BESS integration. [5][4][2]

Organization

Solar Watt Systems Inc.

Barbados-based EPC/installation contractor for the major 2022–2024 PV and battery expansion. [7]

Organization

Tesla

Manufacturer of the 500 kW/1 MWh battery integrated during the earlier 1.5 MW PV phase. [4]

Organization

The Mustique Company Ltd.

Island owner/utility, project client, asset owner, and operating organization through its Utilities and Renewable Energy department. [2][6][7]

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
1000 [1]
KW Gas/Diesel
3000 [1]
Current photovoltaic capacity
7,000 kWp in DHYBRID's Phase I/II case pages and Solar Watt's 2024 account. [2][3][7]
Current battery system
5,200 kW/10,000 kWh in DHYBRID's BESS Extension Phase II case—approximately 1.9 hours at rated power. [2]
Current diesel plant
10,680 kVA installed plant in the current Phase I/II case pages. Generator count, engine makes/models, kW rating, and usable derated capability are not disclosed. [2][3]
2015 phase
1 MWp PV integrated with several diesel generators averaging about 3 MVA output; commissioned September 2015 after approximately seven weeks of construction. [5]
Intermediate Tesla phase
1.5 MW total PV, 500 kW/1,000 kWh Tesla storage, and 3,500 kVA diesel plant. The DHYBRID page's size table truncates battery energy to '500 kW/kWh,' but its narrative explicitly states 500 kW/1,000 kWh. [4]
BESS Phase I
1,300 kW/2,257 kWh with 7 MWp PV and 10,680 kVA diesel before expansion to Phase II. [3]
Renewable/fuel claims
Mustique targeted up to 70% solar provision in 2022. Solar Watt reported about 70% fuel-dependency reduction after reaching 7 MW and roughly 30% from a recent 3 MW addition; these are operator/contractor claims whose accounting periods and demand conditions are not fully disclosed. [6][7]

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

Microgrid control

DHYBRID Power Systems — Universal Power Platform

Coordinates PV and BESS charging/discharging and starts/stops diesel generators; evolved from the 2015 Fuel Reduction System with SCADA, remote monitoring, and ring communications. [5][4][2]

02

Intermediate battery

Tesla

500 kW/1 MWh battery system integrated with the 1.5 MW PV phase; exact Tesla product designation was not stated. [4]

03

Current BESS

Model not publicly disclosed

5.2 MW/10 MWh final Phase II battery installation; DHYBRID's public page does not identify battery manufacturer, model, or chemistry, so it should not be assumed to be the same Tesla equipment as the intermediate phase. [2]

04

Photovoltaics

Model not publicly disclosed

7 MWp island-wide current total; public sources reviewed do not identify module or inverter manufacturers/models. [2][7]

05

Diesel generation

Model not publicly disclosed

10,680 kVA plant retained for firm capacity/backup; make, model, unit count, and fuel-storage autonomy not disclosed. [2]

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.

  • Control architecture

    The Universal Power Platform prioritizes solar, schedules battery charge/discharge, and automatically starts/stops diesel units. The original 2015 system added permanent remote monitoring, SCADA, and ring communications to address island-grid fluctuations. [5][4]

  • Operational demonstration

    Solar Watt reports the island ran exclusively on PV/battery energy for 18 hours in a May 2023 trial. This is a demonstrated interval, not evidence of year-round 100% renewable supply. [7]

  • Savings evolution

    The 2015 supplier projected/claimed about 490,000 liters diesel and 1.2 million kg CO2 saved annually with 3.5-year payback. The later 1.5 MW PV/1 MWh battery page claims 762,000 liters and 1.78 million kg CO2 annually. These are phase-specific supplier figures, not additive savings. [5][4]

  • Phase boundary

    The 1 MW, 1.5 MW, BESS Phase I, and 7 MW/Phase II descriptions are sequential configurations. Do not add their PV or battery ratings together. [5][4][3][2]

  • Expansion caveat

    Solar Watt's February 2024 article also said a further 1.1 MW Lagoon project was under construction. It is excluded from the 7 MW installed total absent a later completion source. [7]

Provenance

7 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 2021-01-17

  2. [2]
  3. [3]
  4. [4]
  5. [5]
  6. [6]
    Conservation Update Summer 2022

    Mustique Island / The Mustique Company · Primary source

  7. [7]
    Solar Watts Goes to Mustique

    Solar Watt Systems Inc. · Primary source

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