Remote Mining Asset — Hybrid Energy Pre-DD

Executive summary

This review screens whether a 60% renewable diesel, solar and battery hybrid is a better candidate for detailed testing than a short-life standalone option or a 100% renewable case. It combines public-map interpretation, a preliminary siting opportunity-and-constraint screen, approval-pathway questions, microgrid boundary questions and financeability observations into a single initial assessment.

On the public information available, the 60% renewable hybrid (S4) is the case selected for hourly and commercial validation. The mapping identifies preliminary PV and BESS/PCS search areas, constraints, review areas and locations requiring owner confirmation. These are not equipment footprints or approved sites. The review identifies the information and analysis needed next.

Project context

The asset is a remote, weak-grid gold-mine setting in the Northern Territory, historically dependent on diesel generation. Remote and off-grid mines typically want to reduce diesel exposure, lower operating cost and improve emissions performance — and the first question is whether the ownership, contract, approvals and customer savings can support a viable project.

Indicative annual demand is about 30 GWh per year, reconstructed from public environmental-impact material. The review tests a solar PV + BESS + diesel hybrid under a third-party / Energy-as-a-Service style structure, across a range of renewable shares.

Readiness

Key findings

• The 60% renewable hybrid (S4) is the scenario selected for further validation. It is not a final design or an investment recommendation.
• The siting output is a desktop search-area screen. It separates preliminary opportunities, strong constraints, review-required areas and owner-confirmation areas; it does not identify approved buildable land.
• A higher renewable share did not always improve the result in the screening model. The 100% annual-renewable target requires substantially more capital and needs hourly reliability and equipment validation.
• A modelled 1.30x DSCR constraint is not lender approval. Debt was resized in each scenario to that simplified constraint.
• Further work is required before any decision — owner data room, hourly dispatch modelling, EPC pricing and specialist due diligence.

Risks

• Approval delta (F1): whether the project fits the existing approval pathway, or triggers new issues around disturbance, MMP / licence variation, water, fire, heritage, biodiversity, closure or ownership chain.
• Site suitability (F2): usable area, setbacks, watercourses, roads, pipelines and closure areas constraining where PV, BESS, PCS and interconnection can realistically sit.
• Microgrid boundary (F3): how PV, BESS, diesel, PCS, EMS and mine loads connect, and the SLD, switchboard, metering and load data required before reliability can be assessed.
• Financeability (F4): mine-life and contract tenor risk, residual buy-out, debt sizing and whether the contracted structure can support debt service.

Open questions

• Which land, access and disturbance areas can the owner make available for energy infrastructure?
• What hourly load, diesel dispatch and reliability criteria must the hybrid system meet?
• Which party owns and operates the PV, BESS, diesel plant, connection assets and control system?
• What contract tenor, payment floor, residual treatment and credit support could support finance?

Next steps

1. Open an owner data room — confirmed mine plan, load and diesel data.
2. Run hourly dispatch modelling to validate the renewable share and reliability.
3. Define scenario-specific PV, BESS, diesel, fuel-use and dispatch schedules, then obtain indicative EPC pricing for the configuration selected for validation.
4. Commission specialist due diligence (technical, approvals, legal, commercial).
5. Develop the commercial structure and a CP / financial-close pathway.

Spatial

F2 site suitability was worked in two stages. First, public-source layers were digitised from environmental-assessment material to establish the evidence context — what the record shows about watercourses, disturbance areas, existing infrastructure, closure areas and access. Second, that context was interpreted into a screen separating preliminary opportunities, strong constraints, review-required areas and areas needing owner confirmation.

The candidate PV and BESS search polygons from the second stage are held with the site-specific work; the spatial method is on the methodology page.

Sources and downloads

Two PDF reports sit behind this screen — an integrated F1–F4 development and financeability review, and a financeability deep dive on owner, SPV and lender economics. They name the asset, so they are no longer offered as public downloads. They are available on request, and the substance is published on this page and in the claim and evidence registry either way.

Maps, and reports available on request

• Pre-DD screen — full report (PDF, 8 MB). Available on request.
• Hybrid energy financeability report (PDF, 7 MB). Available on request.

Technical resources. Machine-readable record: project entity · project JSON · claims · evidence · Data & API.