Sustaining Momentum: Reflections from Parramatta Light Rail Stage 1

By Thiru Jallendran, Director – Pure Environment

In September 2025, Parramatta Light Rail Stage 1 – Supply, Operate and Maintain achieved an IS v1.2 As Built “Leading” rating of 76.76.

For many, that number represents a certification milestone. For those of us involved in delivery, it represents something more considered: coordination, persistence, recalibration, and a shared commitment to lifting performance beyond contractual expectation.

Pure Environment was engaged in October 2023 to review existing credit documentation and support the Infrastructure Sustainability (IS) process. What began as a targeted review evolved into full sustainability leadership across the SOM package, including IS Accredited Professional (ISAP) services, strategy refinement, modelling oversight, verification response management, and coordination with Transport for NSW.

The contractual target was 70 (Excellent). The final certified score was 76.76 (Leading). More importantly, the uplift contributed meaningfully to the overall program ambition across five packages, reinforcing the strength of a collaborative, whole-of-program approach.

A Compressed Window, A Shared Effort

The project commenced in December 2018. Pure Environment joined in October 2023.

Within a relatively short period, the team delivered:

• Design Round 1 – February 2024

• Design Round 2 – July 2024

• As Built Round 1 – December 2024

• As Built Round 2 – July 2025

• Certification – September 2025

Across those phases, sustainability governance was stabilised, resource modelling was reviewed and corrected, and operational strategies were consolidated to ensure alignment with IS v1.2 requirements.

Data that had previously been fragmented was cleaned, recalibrated and aligned with methodology. Energy, water, materials and waste modelling were refined to accurately reflect project performance. This was not about reframing outcomes, it was about restoring clarity and confidence in the numbers.

Sustainability in infrastructure delivery often depends less on grand gestures and more on disciplined coordination.

Operational Energy and Net Zero

Transport for NSW had committed to an operational Scope 2 Net Zero pathway prior to our engagement. Our role was to ensure that delivery decisions and modelling did not disrupt that commitment and that the pathway remained intact through completion.

The Supporting Asset Maintenance Facility (SaMF) features a 300 kWp rooftop solar PV system generating approximately 400 MWh of renewable electricity annually. This is complemented by:

• Regenerative braking within the LRVs

• Surge Protection Devices (SPD) improving operational resilience

• Optimised operational energy modelling

Together, these measures support long-term operational efficiency and carbon performance.

Net Zero, in this context, was not a headline, it was an operational discipline.

Designing Before Building

Sustainability is not only about materials and energy. It is also about ensuring infrastructure performs well for the people who use and operate it.

Before stops and vehicles were finalised, they were tested, both physically and virtually. Low-fidelity and high-fidelity mock-ups were constructed to validate accessibility, spatial configuration and constructability. These physical prototypes allowed stakeholders to experience scale and materiality before rollout.

The LRV cab environment went further. An immersive virtual reality mock-up enabled train operators and engineers to sit within a physical cabin setup while wearing VR headsets. This allowed real-time assessment of layout and configuration options from the operator’s perspective.

The result was informed refinement of sightlines, ergonomics and control positioning before final delivery.

It was a reminder that long-term sustainability also depends on human-centred design.

Water Stewardship and Corridor Ecology

Beyond energy, the project embedded practical water efficiency measures.

Rainwater harvesting and recycled water systems achieved approximately 76% potable water substitution across operations. Non-potable infrastructure, including dedicated recycled water networks, supports irrigation and operational water demands such as toilet flushing, train washing and fire testing.

Along the corridor, more than 33,000 plantings enhance biodiversity and habitat connectivity. Green track sections soften the infrastructure footprint and integrate the light rail into surrounding neighbourhoods.

These measures are not visually dominant. They are intentionally integrated, part of the landscape rather than imposed upon it.

Place, Culture and Interpretation

Infrastructure can either move through place quietly or actively contribute to it.

Timber interpretive sculptures and Indigenous language pavers were incorporated across the corridor, embedding local cultural narratives within the public realm. These elements are subtle but meaningful. They acknowledge heritage while contributing to contemporary urban identity.

Sustainability, at its best, strengthens ecological systems while respecting cultural ones.

Lessons in Stewardship

Having delivered IS ratings since 2017, I have come to appreciate that certification outcomes are rarely about isolated initiatives. They are about governance, consistency and shared ownership.

On Parramatta Light Rail Stage 1, sustainability performance was not driven by a single organisation. It was shaped by collaboration between operators, engineers, client representatives and delivery partners. Our role, at Pure Environment, was to help align those moving parts, to bring clarity to modelling, discipline to documentation, and stability to the rating process.

The final result, 76.76 and a Leading outcome, reflects that collective effort.

Looking Forward

Infrastructure projects are long-lived assets. Their sustainability performance extends well beyond certification dates. The real measure of success will be seen in:

• Reliable renewable energy generation

• Efficient operational performance

• Reduced potable water demand

• Thriving corridor vegetation

• Positive user and operator experience

If there is a broader reflection from this journey, it is this:

Sustainability is not a target achieved at handover. It is a standard upheld throughout design, delivery and operation. Parramatta Light Rail Stage 1 demonstrates what is possible when that standard is maintained, even within compressed timeframes and complex program structures.

None of what was achieved here would have been possible without the sustained commitment of the broader project team - CAF, GRCLR, subcontractors, sustainability and environmental professionals, Transport for NSW and the Infrastructure Sustainability Council - whose dedication and collaboration carried the project from inception through to certification.

It has been a privilege to contribute to that journey.