Why Modern Power Grid OT Networks Are Critical to Grid Reliability and Security

Operational technology (OT) networks are fundamental to the safe and reliable operation of electricity grids. They connect the mission-critical applications that monitor, control and protect power infrastructure, often operating behind the scenes but with direct consequences for service continuity and public safety.

As utilities introduce more data-intensive digital applications, these networks are facing increasing demands. At the same time, growing exposure to cyberattacks is making them more attractive targets for malicious actors. Modernising power grid OT networks has therefore become an important part of maintaining reliable electricity services and meeting evolving security and regulatory requirements.

Why electricity utilities are facing growing OT network challenges

OT and Supervisory Control and Data Acquisition (SCADA) applications have different connectivity requirements from conventional information technology (IT) systems. They depend on consistently low latency, precise time synchronisation and reliable delivery of control, protection and signalling traffic.

Even brief interruptions can have serious consequences. Network performance must remain predictable, particularly when applications are responsible for monitoring equipment, controlling power flows or protecting critical infrastructure.

However, utilities are increasingly deploying applications such as fibre sensing, remote operations, IEC 61850-based substation automation, analytics and real-time control. Many existing networks were designed around specific applications and are not equipped to accommodate these newer requirements.

This has resulted in fragmented infrastructure, with separate networks supporting different operational functions. Maintaining these isolated systems can increase costs, complicate management and make future expansion more difficult.

Technology modernisation and IT/OT convergence

An April 2026 report by IDC identifies several challenges facing utilities and other organisations operating in regulated industries.

The research surveyed 751 respondents across regulated sectors. Among the leading concerns were technology procurement and lifecycle management, implementing technology upgrades and new applications, aligning technology decisions with business requirements, and advancing the convergence of IT and OT environments.

These issues reflect the complexity of modernising infrastructure that must remain operational while new technologies are introduced.

Utilities must also respond to growing expectations from regulators and the public concerning network resilience and cybersecurity. OT infrastructure needs to meet security requirements that place particular emphasis on availability, operational continuity and risk reduction.

According to the IDC report, the three leading OT security concerns across regulated industries are:

• Downtime and service disruption resulting from cyberattacks.
• Detecting threats and identifying unusual network activity.
• Gaining visibility into OT and SCADA devices connected to operational networks.

Why power grid OT networks need modern wide-area connectivity

One approach gaining importance is the development of wide-area networks (WANs) designed specifically for operational technology.

Modern Internet Protocol/Multiprotocol Label Switching (IP/MPLS), optical transport and WAN technologies can provide the performance and capacity required by networks combining legacy infrastructure with newer digital applications.

These architectures are intended to address demanding requirements for connectivity, latency and availability across geographically distributed power infrastructure.

They can also support applications such as the integration of distributed energy resources (DERs) and the automation of intelligent electronic device (IED) operations.

Six benefits of modern IP/MPLS WANs

When designed around the requirements of utility operations, IP/MPLS-based WANs can provide several advantages.

1. Predictable network performance

OT applications require consistent and dependable connectivity. Capabilities such as bounded latency, minimal packet loss and predictable traffic handling help ensure that control, protection and signalling information reaches its destination reliably.

2. Stronger cybersecurity

Network segmentation, isolation and controlled access can help limit the exposure of critical OT systems. These measures reduce the risk of unauthorised access and support compliance with security requirements applicable to operational infrastructure.

3. High availability and rapid recovery

Automated network protection and diverse communication paths can help maintain connectivity when equipment or links fail. Millisecond-level recovery capabilities are particularly valuable for applications that cannot tolerate prolonged interruptions.

4. Simplified network management

Replacing multiple application-specific networks with a converged architecture can reduce infrastructure complexity. Utilities can manage the connectivity requirements of different OT applications through a more unified network.

5. Easier integration of new infrastructure

IP/MPLS and Segment Routing technologies provide flexibility when connecting new substations, distributed energy resources and data centres. This can make network expansion and the introduction of additional applications easier to manage.

6. Lower total cost of ownership

A modern network architecture can reduce the long-term costs associated with maintaining multiple legacy systems. Greater automation, improved visibility and support for a wider range of applications can also help utilities make more efficient use of their infrastructure.

Technologies enabling the next generation of OT WANs

Several networking developments are influencing how utilities design and operate wide-area OT infrastructure. The IDC report highlights a number of important technology trends.

Intelligent routing and automated resilience

IP/MPLS and Segment Routing platforms can provide intelligent traffic management and automated recovery when network failures occur. These capabilities help maintain connectivity for critical applications without relying entirely on manual intervention.

Converged IP and optical transport

Combining IP networking with optical transport can simplify network architecture. A more integrated approach can help improve resilience, accelerate recovery and reduce the cost and complexity of operating separate infrastructure layers.

Deterministic transport for OT traffic

Time-sensitive operational applications need predictable network behaviour. Deterministic transport capabilities allow utilities to prioritise critical traffic and establish dedicated paths for applications with stringent latency and reliability requirements.

OT-focused cybersecurity

Security measures designed for operational environments include network segmentation and controlled connections between OT systems and other networks. These approaches help limit the potential impact of cyber incidents and reduce unnecessary exposure.

End-to-end visibility and network assurance

Telemetry, monitoring and analytics provide utilities with greater insight into network performance and connected devices. Better visibility can help identify unusual activity, detect developing problems and support more effective network management.

Modernisation without disrupting essential operations

Utilities cannot simply replace all existing infrastructure at once. Phased migration strategies allow them to introduce modern networking capabilities while continuing to support essential legacy systems and applications.

Modern WAN infrastructure is becoming essential to grid resilience

The reliability of operational technology networks has a direct bearing on the safety, efficiency and resilience of electricity grids. As utilities connect more systems and adopt increasingly sophisticated digital applications, the limitations of older, fragmented networks are becoming harder to overcome.

Modern IP/MPLS, optical transport and WAN technologies offer a way to address these challenges through more predictable performance, stronger security, greater availability and simpler network management.

For electricity providers, the transition is not simply a matter of upgrading telecommunications infrastructure. It is about creating a dependable foundation for increasingly digital grid operations while maintaining the continuity of essential services.

Investing in resilient and secure OT networks can also help utilities respond to rising regulatory expectations and evolving cyber threats, while preparing their infrastructure for future operational demands.