Software maintenance for energy & supply: How EVUs modernize their legacy systems in a future-proof manner

Software Maintenance for Energy Supply: How EVUs Modernize Their Legacy Systems

Short: Published: 11 February 2026 | Updated: 4 May 2026 Author: Björn Groenewold

Published: 11 February 2026 | Updated: 4 May 2026 Author: Björn Groenewold

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The Urgency of Software Rescue in the Energy Sector

Short: Energy utilities often run SCADA and control systems that are decades old.

Energy utilities often run SCADA and control systems that are decades old. A failure in these systems directly threatens supply security.

Software rescue stabilizes these systems through targeted patching. It also removes outdated dependencies. The goal is a step-by-step migration to modern platforms — without interrupting critical operations.

Why the Energy Transition Changes Everything

The energy transition forces utilities to adopt decentralized, renewable production. Processes must also be fully digitalized. The main obstacle is rigid legacy IT built up over decades.

Strategic software rescue reduces this technical debt. It modernizes IT to meet the demands of:

• Smart grids
• Dynamic energy markets
• Stricter compliance rules

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The Cost of Legacy Systems: Four Concrete Problems

Short: Many energy utilities still run core processes on systems from the 1990s and 2000s.

Many energy utilities still run core processes on systems from the 1990s and 2000s. This adds technical debt year by year. Four problems are typical.

1. High Operating Costs

Legacy systems need specialized expertise that is becoming scarce. Spare parts and old software licenses are hard to obtain. Personnel costs for niche skills keep rising.

2. Security Vulnerabilities and Compliance Risks

Outdated software no longer receives security updates. It is vulnerable to modern cyberattacks. This is a critical risk for operators of essential infrastructure.

Compliance with standards like NIS2 becomes much harder without current software.

3. Reduced Scalability and Interoperability

Legacy systems cannot handle data from:

• Smart meters
• IoT devices
• Decentralized energy producers

Connecting modern applications requires expensive, error-prone workarounds.

4. Blocked Innovation

New business models like dynamic tariffs need flexible IT. Rigid legacy systems block their implementation.

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What Software Rescue Delivers

Short: A structured software rescue program addresses these problems in stages:

A structured software rescue program addresses these problems in stages:

• Stabilization: Targeted security patches close critical vulnerabilities immediately
• Decoupling: Outdated dependencies are replaced without touching the core system
• Interface modernization: APIs connect the system to modern tools and platforms
• Gradual migration: Core functions move to modern platforms step by step

This approach preserves operational continuity. There is no need for a high-risk full replacement.

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Why Now Is the Right Time

Regulatory Pressure Is Increasing

NIS2 compliance is now mandatory. Smart grid requirements demand real-time data processing. Waiting only adds to technical debt and compliance risk.

A structured rescue program reduces both at the same time.

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References and Further Reading

• Bitkom — German digital industry association
• German Federal Office for Information Security (BSI)
• European Commission — Digital strategy

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About the Author

Short: Björn Groenewold (Dipl.

Björn Groenewold (Dipl.-Inf.) is Managing Director of Groenewold IT Solutions GmbH. Since 2012, he has supported over 250 projects — from legacy modernization to AI integration.