The rapid evolution of the Asia-Pacific and Southeast Asian (APAC/SEA) energy sector presents a distinct operational challenge. As utilities invest in smart grids, renewables and cross-border initiatives such as the ASEAN Power Grid, they remain heavily reliant on legacy infrastructure. The 2026 APAC/SEA Energy OT Cybersecurity CXO Priorities executive research, sampling over 50 critical infrastructure leaders across Australia, India, Indonesia, the Philippines and Thailand, highlights the friction between maintaining 24/7 uptime and managing modern cyber risks.
To systematically address these challenges, organisations are increasingly structuring their resilience strategies around a three-phase operational model: Discover, Assess and Protect.
1. Discover: Overcoming the visibility deficit
Accurate risk management relies on continuous asset visibility, yet inventory fragmentation remains widespread across the region:
- 30% of operators maintain automated tracking at modern facilities but rely on manual processes at legacy sites.
- 27% lack centralised oversight entirely, tracking assets strictly at the local plant level.
In highly distributed Operational Technology (OT) environments, active network scanning risks destabilising fragile control equipment. A robust discovery strategy relies on passive, non-intrusive asset identification. By capturing continuous network telemetry, operators can map modern and legacy assets in real time without triggering downtime, laying the baseline for compliance with domestic legislation such as Australia’s SOCI Act and Thailand’s Cybersecurity Act.
2. Assess: Quantifying legacy vulnerabilities and supply chain exposure
Once assets are mapped, evaluating operational risks requires assessing both software lifecycles and third-party supply chain access:
- 43% of surveyed operators state that 41% to 70% of their operational environment consists of unpatchable legacy infrastructure.
- 30% rely on ad-hoc verification for transient hardware (such as vendor laptops and USBs), while 27% enforce no formal file-scanning mechanisms.
Despite these structural exposures, 44% of organisations manage cybersecurity expenditure reactively, allocating capital primarily after an active incident occurs. Proactive assessment requires moving beyond event-driven spending to systematically quantify software vulnerabilities and physical entry points before a breach occurs.
3. Protect: Deploying OT-native safeguards without production disruption
Mitigating threats in continuous production environments demands defensive controls that do not rely on disruptive reboots or conventional software updates. Survey data indicates significant variance in regional mitigation capabilities:
- 27% of operators possess active inline enforcement to block threats in real time.
- 27% maintain passive visibility only, unable to block malicious activity dynamically without risking a facility shutdown.
- 35% rely solely on basic IT-OT perimeter firewalls, leaving internal networks exposed to lateral threat movement.
To bridge these defensive gaps, modern architectures deploy network-level compensating controls. Virtual patching shields unpatchable endpoints from known exploits without requiring system reboots. Furthermore, granular micro-segmentation and mandatory data-cleansing kiosks for transient devices restrict lateral movement, ensuring threats are contained without compromising overall grid stability.
Conclusion
Transitioning from reactive remediation to proactive resilience requires an integrated lifecycle approach. By systematically discovering assets non-intrusively, assessing supply chain exposure and protecting critical endpoints with OT-native controls, energy operators across the APAC/SEA region can satisfy stringent regulatory frameworks while safeguarding continuous power generation.
