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
National OT Security Uplift Project
Calexi staff supported a major federal government-led cyber uplift program for critical infrastructure across Australia. Working with asset owners in energy and utilities, our team conducted rapid assessments, identified gaps, and implemented risk-mitigation strategies under tight timelines. The result was a significant uplift in control system security and governance, helping operators meet compliance expectations while protecting essential services.
Secure Architecture and Operations for Multi-Site Infrastructure
In prior work, Calexi consultants were involved in designing, securing and operationalising infrastructure systems across multiple sites. Our staff led the implementation of network segmentation, firewall policy tuning, and SIEM onboarding, while also producing compliant documentation aligned with ISM and SOCI frameworks. This experience reflects our ability to deliver secure-by-design solutions in complex, multi-stakeholder environments.
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.