Migration Scenario: Rehost Windows Server on Azure & Refactor/Replatform SQL on Azure.

Customer Profile

  • Core Business: Sustainable Energy and Utility Infrastructure Management.
  • Industry: Energy & Utilities.
  • Geography: United Kingdom (Lancashire).
  • Organisation Size: Mid-market enterprise (transitioning core legacy systems).

The Challenge

The client faced a critical infrastructure deadline driven by a physical office relocation. Their primary business-critical application was running on-premises with a recovery time objective (RTO) of 24 hours. The objective was to migrate the environment to Azure to eliminate physical hardware dependencies while modernising the data layer to improve resiliency and performance.

The Solution

Telana executed a hybrid migration and modernisation strategy completed in late 2025.

  • Compute Tier (Rehost): Migrated legacy web and application tiers to Windows Server 2019 Virtual Machines running IIS 10 on Azure.
  • Data Tier (Refactor/Replatform): Modernised the 270GB  SQL Database by migrating it from on-premises SQL Server to Azure SQL Managed Instance (MI).
  • Integration & Orchestration: Implemented Azure Data Factory (ADF) with a Self-Hosted Integration Runtime to manage complex data synchronisation between Azure and remaining on-premises utility meters.
  • Resiliency: Established a secondary Disaster Recovery (DR) site in the UK West region using Azure SQL Failover Groups for real-time data replication.

The Outcome

  • Improved Resiliency: Successfully reduced the RTO and Recovery Point Objective (RPO) from 24 hours to under 2 hours.
  • Operational Efficiency: The nightly invoice synchronisation process, which previously struggled with legacy on-premises hardware, was optimised to complete in 90 minutes.