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OPC UA is the standard protocol (IEC 62541) that connects industrial PLCs to IT systems, with built-in security and rich information models that Modbus or Profibus cannot match. Incremental adoption in phases, starting with an observer-mode gateway that leaves existing PLCs untouched, lets a plant running decades-old equipment modernise without stopping production.
Containerising SCADA makes sense for the upper architecture layers: HMI, historians, and data gateways. PLCs still control hardware with hard determinism. The biggest risk is cultural: applying DevOps patterns without adapting to OT context causes incidents. NIS2 requires managing containers as any other critical infrastructure asset.
Digital twins in energy simulate transmission grids, wind farms, and conventional plants in real time. They predict failures weeks ahead, cut corrective maintenance 10-25%, and deliver payback in 18-36 months. The main obstacles are IT/OT integration and cybersecurity; not every asset justifies the investment.
