Fortescue engaged Evolveable to undertake an independent expert review of greenhouse gas (GHG) emissions to satisfy a five-yearly review condition imposed by the environmental regulator.
The requirement was clear. An independent, technically rigorous assessment was needed to demonstrate that emissions estimates, methodologies and assumptions remained appropriate, current and defensible. For the internal environment and sustainability lead, the priority was confidence that the review would withstand regulatory scrutiny, without triggering unnecessary rework or operational disruption.
The Problem: Regulatory Obligation, Limited Tolerance For Uncertainty
The five-yearly review condition required Fortescue to demonstrate that its GHG estimation approach remained aligned with contemporary guidance, operational reality and regulatory expectations.
Key challenges included:
- Multiple assets with different operating profiles, emissions sources and maturity across mining, processing and supporting infrastructure.
- Emissions methodologies that had evolved over time, with legacy assumptions needing to be reassessed against current guidance and best practice.
- A requirement for independence, meaning the review needed to go beyond internal assurance or routine compliance checks.
- Regulator expectations that the review be technically robust, clearly documented and defensible if queried.
- Tight internal timelines and limited appetite for asset teams to revisit emissions work unless clearly justified.
For the sustainability lead, the risk was twofold: failing to satisfy the EPA condition, or opening up broader questions that could delay approvals or create additional regulatory exposure.
The Approach: Independent, Engineering-Led Stress Testing Of Ghg Estimates
Evolveable was engaged as an independent expert to apply a targeted, engineering-based review focused on regulatory defensibility rather than wholesale re-calculation.
The review was designed to answer one core question: are the emissions numbers and methods something the company can stand behind with confidence today?
We:
- Reviewed emissions estimation methodologies across key sources, including combustion, fugitives, processing and ancillary activities.
- Assessed alignment with applicable guidance, emission factors and global warming potentials current at the time of review.
- Tested key assumptions against engineering reality, operating conditions and regulator expectations for large-scale mining operations.
- Identified where assumptions had drifted from best practice, or where documentation needed strengthening to reduce regulatory risk.
- Clearly distinguished between issues that required action and those that could be managed through improved explanation or sensitivity analysis.
- Prepared an independent expert report suitable for submission to the regulator, written in clear, non-ambiguous language
The work was deliberately scoped to minimise disruption to operational teams, with targeted engagement only where clarification was genuinely required.
The Outcome: Regulator Confidence Without Unnecessary Rework
The independent review provided Fortescue with a clear, defensible position against its EPA condition, without creating avoidable complexity.
Key outcomes included:
- Confirmation that the core emissions estimation framework remained appropriate and fit for purpose.
- Targeted recommendations to strengthen documentation, assumptions and transparency where it materially improved defensibility.
- Clear, independent expert commentary that could be relied on in regulator engagement.
- Reduced risk of follow-up information requests or regulator challenge.
- Confidence for the sustainability lead that the five-yearly condition had been met in substance, not just form.
For Tier 1 miners subject to periodic regulatory review conditions, this case highlights the value of engaging an independent expert who understands both environmental engineering and how regulators assess GHG work in practice.
Evolveable helps teams move from “we comply” to “we can defend this”, without turning a mandatory review into an open-ended compliance exercise.
