Energy Islands in Practice: Why HVDC, System Integration, and Commissioning Are Critical
Energy islands are often described as the next step in Europe’s green transition. Behind the strategic vision, however, lies a technical reality that clearly distinguishes energy islands from traditional energy projects.
Where classical interconnections primarily focus on transmission from point A to point B, energy islands are about large-scale system integration. This introduces new requirements for HVDC technology, control, operation, and — not least — commissioning.
HVDC as the backbone of energy island infrastructure
Energy islands cannot function without HVDC. Long distances, high power levels, and the need for flexible control make direct current the core technology of energy island infrastructure.
Where traditional HVDC connections are typically point-to-point solutions, energy islands:
- Multi-terminal HVDC systems
- Multiple simultaneous connections
- Dynamic power distribution between markets
This significantly increases system complexity. Voltage, frequency, and power flows must be controlled continuously, and a failure in one part of the system can affect the entire energy network.
HVDC therefore becomes more than a transmission medium — it becomes an active control tool in the future energy system.
System integration: when the whole matters more than the components
In energy island projects it is not enough for individual components to work in isolation. Wind turbines, converter stations, cables and land-based systems must work as a single system.
This means that:
- Interfaces between systems become critical
- Control and automation systems play a much greater role
- Fault scenarios must be managed across grids and national borders
System integration therefore becomes a core competence in energy island projects — on par with construction, installation, and assembly.
Mechanical inertia and new operating conditions in the energy system
A key technical aspect of energy islands is the absence of mechanical inertia. In conventional power plants, heavy rotating machinery provides inherent system stability. This stabilising effect does not exist in the same way in systems dominated by offshore wind, solar power, and HVDC.
Energy islands therefore operate in:
- Low-inertia or zero-inertia systems
- Where frequency and voltage are actively controlled through power electronics
This places high demands on:
- Frequency regulation
- Voltage control
- Protection systems
- Advanced control strategies
Operating energy islands therefore requires a deep technical understanding of modern power system dynamics.
Commissioning: where complexity converges
In energy island projects, commissioning is one of the most critical phases. Here, not only individual components are verified, but the interaction between entire systems.
Commissioning includes:
- Testing of system integration
- Verification of control and protection functions
- Simulation of operational and fault scenarios
- Coordination across countries, suppliers, and system owners
On energy islands, commissioning cannot be carried out sequentially and in isolation. Many functions are interdependent, and errors in planning can have system-wide consequences. Experience, structure, and situational awareness are therefore essential.
Operation and maintenance in a new type of energy infrastructure
After commissioning, complexity continues. Energizers are active energy systems that will be operated and maintained over decades.
Operations are influenced by:
- variable offshore wind generation
- Changing market conditions
- New interconnections and technologies
- Increasing requirements for cybersecurity and system resilience
This places high demands on continuous monitoring, analysis, and operational adaptation.
Technology, people, and system understanding
Energy islands are technologically advanced facilities. But their success ultimately depends on people who can:
- Plan complex projects
- Coordinate system interfaces
- Execute effective commissioning
- Ensure stable and secure operation
Competencies in HVDC, system integration, commissioning, and energy system operation therefore become central to the future energy infrastructure.
About Sirius Energy
Sirius Energy is a Danish consultancy specialising in energy infrastructure, high-voltage systems, HVDC, offshore wind, system integration, commissioning, and site management.
We work close to installation, testing, commissioning, and operation of complex energy facilities, contributing hands-on experience from some of Europe’s most demanding energy projects.
