61 PV Plants & 22 Substations — Legacy SCADA Migration to N3uron on Microsoft Azure

A Legacy SCADA System Limiting Visibility Across 61 Plants and 22 Substations

Before this migration, the client operated 61 PV plants and 22 substations on a legacy centralized cloud-based SCADA system, with local RTUs at each site but no HMI available locally — meaning real-time visibility and control depended entirely on an aging, centralized architecture with limited scalability.

No Local Visualization, Only a Standard Plant Model

The current setup relied on a standard plant model with no local HMI, creating a gap between what was happening at each individual PV plant or substation and what operators could see and act on centrally — a significant risk as the renewable energy portfolio continued to scale.

Multi-Protocol Complexity Across a Distributed Asset Base

With Modbus TCP, IEC-102, and IEC-104 protocols in use across RTUs at each site, any migration had to preserve full protocol compatibility while modernizing the underlying SCADA platform — a non-trivial integration challenge across 83 total sites (61 plants plus 22 substations).

Migrating Without Disrupting Live Power Generation Assets

Because these are active power generation and substation assets, the migration needed to be executed without operational disruption — ruling out a single disruptive cutover and requiring a carefully sequenced, parallel migration approach instead.

A Full Migration to N3uron SCADA, Centralized on Azure

QAS led the migration of 61 PV Plants and 22 Substations from a legacy SCADA platform to N3uron SCADA, centralized on Microsoft Azure — replacing the previous architecture with a modern, cloud-hosted platform built for scalability and real-time visibility.

A Robust Azure Infrastructure Foundation

The Azure architecture includes 2 Production VMs (Backend and Frontend/WebVision), 1 MongoDB VM, 2 Pre-Production VMs (Local N3 Node and Remote N3 Node), and 1 Development PC with WebUI/WebVision — a structured environment separating production, pre-production, and development to protect live operations during rollout.

Full Protocol Support Preserved Across Migration

Communication protocols, including Modbus TCP, IEC-102, and IEC-104, were fully supported in the new N3uron architecture, ensuring every RTU across all 61 plants and 22 substations continued communicating without requiring hardware replacement at the sites themselves.

Remote Execution With On-Site Field Support

Execution was carried out via VPN with remote implementation support from SCADA engineers, combined with on-site support from field technicians and VPN access to sites and Azure VMs — a delivery model balancing remote efficiency with the on-the-ground support complex substation environments require.

A Structured Migration Approach Using Existing Hardware

The migration approach used existing hardware, adding plants as N3uron local nodes to the central node in Azure, with new plant integrations proceeding in parallel with migration — minimizing capital expenditure while enabling continuous onboarding of additional sites.

Scope Spanning Templates, Testing, and Documentation

The scope of work included developing templates and plant models, creating Modbus/linked tag mappings, integrating plant nodes to the N3uron backend, integrating with WebVision, performing remote communication tests, and preparing documentation per plant — a comprehensive, repeatable process across all 83 sites.

A Large, Cross-Functional Delivery Team

A team of 8 to 12 QAS engineers delivered this migration across onsite and offshore delivery models over a 1+ year engagement — reflecting the scale and technical complexity of migrating an entire multi-site SCADA infrastructure to the cloud.

Centralized Real-Time Monitoring Across Every Asset

The migration delivered centralized real-time monitoring and control across all assets — giving operators a single, unified view across 61 PV plants and 22 substations that the previous legacy architecture could not provide.

High Scalability for Future Renewable Energy Expansion

With high scalability to support future expansion built into the Azure-hosted architecture, the client can onboard new PV plants or substations without re-architecting the underlying SCADA platform — directly supporting continued renewable energy portfolio growth.

Reliable, Secure Cloud Infrastructure

Reliable and secure cloud infrastructure on Azure, combined with role-based access and secure connectivity via VPN, gives the client enterprise-grade security posture across a distributed, geographically dispersed asset base.

Standardized Templates and Faster Deployment

Standardized templates and engineering for consistency, alongside faster deployment and reduced migration downtime, meant each new plant integration could follow a proven, repeatable process rather than being architected from scratch.

Complete Documentation and Communication Test Reports

Complete documentation and communication test reports for every plant give the client a fully auditable migration record — critical for a power generation and substation operator subject to grid reliability and compliance oversight.

A Proven Model for Large-Scale SCADA Cloud Migration

This engagement stands as a flagship reference deployment for QAS's capability to migrate complex, multi-protocol, multi-site SCADA infrastructure to a modern, Azure-hosted N3uron platform — demonstrating Industry 4.0 smart infrastructure principles applied at true utility scale.