Data Centre and Network Migration for a Regulated Utilities Provider

This programme delivered a comprehensive cloud migration and network modernisation initiative for a regulated utilities provider. The scope encompassed data centre infrastructure migration, WAN and LAN network updates, and multi-supplier coordination to deliver a modern, resilient technology platform. Here's how the programme was structured and delivered.

1. Assessing the Legacy Infrastructure

The organisation's existing infrastructure was hosted across ageing on-premises data centres with limited capacity for growth, increasing maintenance costs, and growing concerns around resilience and disaster recovery capability. I led a detailed discovery phase to catalogue all hosted workloads, network dependencies, and integration points. This assessment identified which workloads were suitable for cloud migration, which required re-platforming, and which needed to remain on-premises due to latency or regulatory constraints.

2. Designing the Target Architecture

Working with infrastructure architects, I helped define a hybrid target architecture that balanced cloud adoption with the practical realities of a regulated utilities environment. Key design decisions included:

1. Cloud-first workloads: Business applications, collaboration tools, and non-latency-sensitive systems were migrated to cloud infrastructure for scalability and cost efficiency.
2. Retained on-premises: Operational technology systems and those with strict data sovereignty requirements remained in modernised on-premises facilities.
3. Network modernisation: WAN and LAN infrastructure was upgraded to support the new hybrid architecture, with improved bandwidth, resilience, and security.

3. Migration Planning and Sequencing

With a large and diverse workload portfolio, migration sequencing was critical to managing risk and maintaining business continuity. I developed a migration plan that prioritised workloads based on business criticality, technical complexity, and dependency relationships. Lower-risk workloads were migrated first to build team capability and validate processes, while critical operational systems were scheduled later with additional testing and rollback provisions.

4. WAN and LAN Network Updates

The network modernisation workstream ran in parallel with the data centre migration to ensure that the underlying network infrastructure could support the new hybrid architecture. This included upgrading WAN circuits to provide the bandwidth and resilience needed for cloud connectivity, refreshing LAN switching and wireless infrastructure at key sites, and implementing network segmentation to improve security posture. I coordinated closely between the network and migration workstreams to ensure that network readiness preceded workload migration at every site.

5. Supplier Coordination

The programme involved multiple suppliers — cloud platform providers, network circuit carriers, hardware vendors, and specialist migration partners. I established a supplier governance framework with regular coordination meetings, shared dependency tracking, and clear escalation processes. Managing supplier interdependencies was a constant focus, as delays in circuit provisioning or hardware delivery could cascade across the programme timeline.

6. Testing, Validation, and Cutover

Each migration wave followed a structured testing and validation process to confirm that workloads operated correctly in their new environment. This included functional testing, performance testing, and integration testing with dependent systems. Cutover events were planned as controlled transitions with defined rollback criteria, real-time monitoring, and on-call support teams. Post-migration validation confirmed that all services were operating within expected parameters before the old infrastructure was decommissioned.

Conclusion

This data centre and network migration programme delivered a modern, resilient technology platform for a regulated utilities provider. By combining thorough discovery and planning with disciplined migration execution and effective supplier coordination, the programme achieved its objectives without disruption to critical operational services. The resulting hybrid infrastructure provides the organisation with improved scalability, resilience, and cost efficiency while maintaining compliance with regulatory requirements.