Securing Australia’s Critical Infrastructure
Calexi helps operators protect essential services with practical, compliant, and resilient cyber and engineering solutions.
Need to uplift your infrastructure security? Talk to our critical infrastructure team today.
Industry Challenges and Opportunities
Australia’s critical infrastructure is facing increasing cyber threats, legacy system constraints, and heightened compliance obligations under the Security of Critical Infrastructure (SOCI) Act. Operators in energy, water, transport, communications, and healthcare must now ensure their systems are not only available and functional, but resilient, monitored and secure.
Aging infrastructure and complex, often undocumented systems pose serious risks to operational continuity. Many organisations struggle to map their asset environment, implement secure remote access, or validate system integrity after routine changes. And with the expansion of SOCI obligations, operators now need to prove ongoing compliance; not just during audits, but every day.
This growing complexity calls for trusted partners who understand both the technical and regulatory environments, and can deliver targeted, effective remediation.
Tailored Solutions for Critical Infrastructure
Calexi helps critical infrastructure operators identify, mitigate and manage risk through secure, engineering-led services. Our consultants are security-cleared, regulation-aware, and focused on delivering practical outcomes that strengthen system resilience.
We support critical infrastructure clients by:
- Assessing asset risk and mapping control system environments
- Designing segmented, encrypted OT networks
- Onboarding assets into SIEM and monitoring platforms
- Securing remote access and jump-box infrastructure
- Developing remediation roadmaps and uplift strategies
- Aligning operations with SOCI Act obligations and ISM requirements
- Conducting integrity checks and validating changes
- Providing program leadership for security-focused delivery
We bring a continuous assurance mindset. This helps operators embed security into operations without compromising safety or uptime.
Our Experience in the Field
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Ransomware Incident Response
When a ransomware attack exposed poor practices and failed backups, Calexi led the recovery, restored three months of data, implemented emergency fixes, and re-architected the ICT environment. The organisation avoided major reputational and financial loss while strengthening long-term resilience.
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DISP – Defence Industry Security Program Uplift
A Defence SME needed DISP compliance but faced limited resources and low security maturity. Calexi delivered a full uplift within 6 months, achieving Maturity Level 2, Defence approval, and cost savings all while improving security culture and posture.
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Cyber Security Tabletop Exercise for Large Organisations
A transport critical infrastructure project was at risk due to cascading system failures caused by poor maintenance in a high-security environment. Calexi rapidly stabilised the systems in 2 weeks, reduced the risk profile from very high to medium, recommenced commissioning, and delivered a comprehensive maintenance plan with strong stakeholder confidence.
Why Calexi for Critical Infrastructure
Calexi brings the clarity, structure and real-world experience needed to protect and modernise Australia’s critical infrastructure. We understand the unique operational constraints of OT and ICS systems and know how to build security around safety and service delivery.
Our team holds government security clearances and deep experience across Defence, utilities and regulatory environments. We move fast, communicate clearly, and deliver secure outcomes that stand up to scrutiny.