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UTILITIES & ENERGY

A SCADA Latency Spike
Trips a 400kV Substation.
240,000 Homes Go Dark.

Yemen's power and water utilities are rebuilding around solar, hybrid and distributed generation. The communications infrastructure connecting SCADA control rooms to remote switching equipment must deliver deterministic sub-10ms latency — because a protection relay that trips 15ms late can cascade into a grid-wide blackout event.

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GROUP REFERENCE · NATIONAL UTILITY GRID

127
Utility Substations
<10ms
SCADA Latency Required
25K km
Distribution Network
2M+
Smart Meters Deployed

⚠️ IEC 61850 GOOSE protection requires <4ms — impossible over shared public 4G networks averaging 20–50ms

The Grid Communications Problems That Public Networks Cannot Solve

⚡ IEC 61850 GOOSE Over Public Networks

IEC 61850 GOOSE messages for substation protection must arrive in <4ms. Public 4G delivers 20–50ms average latency with 200ms spikes during congestion. Routing protection relay trip signals over a commercial network is both technically insufficient and a cybersecurity violation — critical infrastructure cannot share bandwidth with Netflix traffic.

↳ HCT: Dedicated private LTE/5G with QCI 1 GBR bearer for protection traffic. Deterministic <4ms, air-gapped from public internet. IEC 62351 security.

📡 AMI Last-Mile Connectivity Gaps

Advanced Metering Infrastructure requires two-way communication to 2M+ smart meters across urban apartments and remote desert areas. PLC (powerline carrier) fails in underground cables. LoRaWAN lacks the capacity for real-time demand response. LTE-M/NB-IoT on public networks creates dependency on carrier availability during grid emergencies.

↳ HCT: Private LTE NB-IoT slice for AMI. 50km cell radii with Band 28. Operator-independent — the utility owns its meter communications.

☀️ Renewable DER Coordination Latency

Solar is now central to Yemen's power supply, from utility-scale plants to thousands of private solar farms, each running on its own inverters. Coordinating frequency response and voltage regulation across distributed energy resources requires <100ms round-trip from control centre to inverter. Cloud-based DER management via public internet cannot guarantee this — causing regulatory frequency deviations.

↳ HCT: Private LTE across solar parks with edge computing for local DER coordination. <20ms round-trip. IEEE 2030.5 and IEC 61968 compliant.

👷 Field Crew Safety & Switching Coordination

Line crews working on 11kV/33kV distribution networks must coordinate switching operations with control rooms in real time. Legacy UHF radio has dead zones in urban canyons and underground vaults. A miscommunicated switching order on an energised line is fatal. Switch authorisation documents are still transmitted via WhatsApp in some operators — a catastrophic safety failure.

↳ HCT: MCPTT over private 5G for field crew with integrated switching permit system. GPS tracking + lone worker monitoring. Zero switching ambiguity.

UTILITY STANDARDS WE COMPLY WITH

  • IEC 61850Substation automation & GOOSE protection messaging
  • IEC 62351Security for power systems communications
  • IEC 62443Industrial cybersecurity for OT networks
  • IEC 61968Application integration for distribution management
  • NERC CIPCritical infrastructure protection cybersecurity

TRUSTED BY UTILITIES ACROSS THE REGION

From National Utilities to African Grid Operators — We Know Grid Communications

HCT Group has supplied telecom infrastructure to national utilities and energy sector clients across the Middle East and Africa. Our engineers understand the difference between IT networks and OT networks — and why utility communications requires a completely different approach to latency, security, and redundancy.

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Frequently Asked Questions

Why do utilities need private networks for smart grid?

Substation automation, teleprotection and SCADA carry latency and reliability requirements that public networks do not guarantee. A latency spike on protection traffic can trip a high-voltage substation. Private 5G and LTE give utilities deterministic performance and full operational control.

Does HCT Group support IEC 61850 substation communications?

Yes. HCT Group designs utility networks to carry IEC 61850 compliant communications for substation automation, alongside smart grid telemetry and field force mobility.

Which utilities does HCT Group work with?

HCT Group's utilities practice includes work referenced against a national electricity &amp; water utility, covering smart grid, substation automation and field operations connectivity.

Can one network serve both grid operations and field workers?

Yes. Network slicing allows a single physical private network to carry isolated logical networks, so protection and SCADA traffic run on a guaranteed slice while field force voice, video and mobility run on separate slices without contention.