Migration Scenario: Rehost Windows servers on Azure.

Customer Profile

  • Core Business: Natural gas terminal operations, maintenance, and gas logistics services.
  • Industry: Energy and Utilities.
  • Geography: United Kingdom
  • Organization Size: Approximately 300 employees.

The Challenge

As part of divestment from its parent organization, the customer had to rapidly separate critical operational applications from legacy shared services and remove dependency on external identity and platform components under strict TSA deadlines. One priority workload was a shift handover and logging platform used by operations teams. The application was hosted on Windows VMs in the former parent Azure environment and required migration to a Grain-controlled platform without disrupting shift operations.

The Solution

Telana delivered a structured Azure migration in controlled waves completed in 2026.

  • Application in scope: Shift handover and logging system supporting operational users.
  • Compute migration (Rehost): Rehosted the application to Azure IaaS using new Windows Server virtual machines in a UK-resident sovereign tenant.
  • Application stack: Rebuilt the target application tier on Windows Server with IIS hosting for the existing .NET workload.
  • Data migration: Exported and imported application data into a new Grain-controlled Microsoft SQL Server database aligned to the new operating boundary.
  • Security and access integration: Integrated workloads with Grain LNG Microsoft Entra ID SSO, Conditional Access, and managed privileged access controls.
  • Resilience architecture: Deployed primary services in UK South with disaster recovery capabilities in UK West, aligned to platform policy and recovery objectives.

The Outcome

  • Separation achieved on schedule: Critical migration milestones were completed to support TSA exit planning and early operational independence.
  • Improved operational control: Grain LNG established a sovereign tenant and workload ownership model, reducing inherited platform dependencies.
  • Reduced service risk: Production workloads moved to a standardized, supportable Azure landing zone with MSP-ready run operations.
  • Security posture uplift: Identity-led Zero Trust controls and centralized monitoring improved access governance and operational assurance.