Renewable energy projects move fast. But substation fire protection must still comply with AS 2067.
If your solar farm, wind farm, or BESS site includes a high-voltage substation, the fire protection requirements under AS 2067 apply. These rules directly affect layout, land use, civil works, insurance acceptance, and long-term risk exposure.
This guide explains how AS 2067 fire protection requirements impact renewable energy substations, with a focus on separation distances, fire barriers, and key design trade-offs.
Separation Distances (AS 2067 Cl. 6.2.2.1)
Clause 6.2.2.1 sets minimum separation distances between:
- Liquid-filled transformers and buildings
- Transformers and adjacent transformers
- Transformers and site boundaries
The required clearance depends on the insulating fluid type:
- O-class fluid (mineral oil)
- K-class fluid (less flammable fluid with higher fire point)
Why Separation Distances Matter in Renewable Projects
Renewable energy sites often aim for compact layouts to reduce:
- Cable length and losses
- Trenching and civil costs
- Overall land footprint
But tighter spacing can create compliance challenges.
Solar farms typically prioritize efficient land use.
Wind farm substations are often located in bushfire-prone areas.
BESS-integrated sites introduce additional fire risk considerations.
Design trade-off:
- Larger separation distances increase land and cable costs.
- Reduced spacing may require fire barriers or alternative transformer fluids.
Selecting a less flammable fluid early in the design phase can reduce required separation distances and simplify fire compliance.
Fire Barriers (AS 2067 Cl. 6.2.4)
When minimum separation distances cannot be achieved, AS 2067 allows for fire-resistant barriers.
These barriers must:
- Be constructed with appropriate fire rating
- Be positioned to block radiant heat exposure
- Meet specific height and structural requirements
Application in Renewable Substations
Fire barriers are commonly used in:
- Constrained solar farm collector substations
- Substation expansions where additional transformers are added
- Co-located BESS and transformer installations
While barriers reduce spatial requirements, they increase:
- Civil construction cost
- Structural complexity
- Project timeline risk
For fast-track renewable developments, barrier construction can affect commissioning schedules.
Real-World Renewable Scenarios
Solar Farm Expansion
Adding a second transformer reduced spacing below minimum requirements. Instead of constructing a fire wall, the project upgraded to a less flammable fluid to maintain compliance.
Wind Farm in High Fire Risk Area
Due to bushfire exposure, mineral oil posed elevated risk. A less flammable fluid improved the overall fire risk profile and supported insurance acceptance.
BESS and Substation Integration
Limited compound space required fire barriers between transformer and battery containers to meet AS 2067 requirements.
Key Design Trade-Offs for Renewable Developers
Fire protection decisions affect:
- Land utilization
- Cable routing and electrical losses
- Civil works scope
- Insurance assessment
- Environmental and bushfire risk
- Total cost of ownership
Early decisions on:
- Transformer fluid type
- Transformer rating
- Site layout and spacing
can prevent redesign during grid approval or construction.
Why Early AS 2067 Compliance Matters
AS 2067 fire protection requirements are not just regulatory obligations. They shape how renewable substations are designed, built, and insured.
Addressing separation distances and fire barrier strategy at the concept stage helps:
- Reduce project risk
- Avoid retrofit costs
- Improve safety outcomes
- Maintain development timelines
For renewable energy substations, fire protection is a design decision — not just a compliance checklist.