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CobraCable (DK–NL) and Viking Link (DK–UK) are classic HVDC interconnectors, linking two markets to enable efficient energy exchange - especially during periods of surplus wind power. Their clear point-to-point design has strengthened the robustness of Europe’s energy markets. But as offshore wind expands and energy systems become more complex and interconnected, point-to-point links alone will not shape the future. Europe needs hubs - not just connections. An energy island is not simply a transmission link. It is a platform where generation, conversion, storage, control and energy trading are integrated into one system. LESSONS FROM VIKING LINK AND COBRACABLE - AND WHY THEY POINT TOWARD ENERGY ISLANDS Through our involvement in Viking Link and CobraCable, Sirius Energy has gained insight into the complexity of large-scale HVDC installations and the realities of cross-border coordination. These projects clearly illustrate why energy islands represent the next step in Europe’s energy infrastructure: - Scale increases significantly when multiple wind farms and countries connect to a single hub - System integration becomes as critical as cable installation - Requirements for operation, control and commissioning grow substantially - Collaboration becomes increasingly multinational Energy islands move Europe from linear infrastructure projects toward integrated energy platforms. WHY BORNHOLM WILL BE A TURNING POINT When the Bornholm Energy Island is realised, it will mark the beginning of a new generation of energy infrastructure projects, named Energy Hubs Bornholm will not only serve as a connection point for offshore wind - it will become a strategic energy hub for the entire region. Denmark and Germany will be linked through a single integrated solution, with future connections to Sweden and Poland potentially built on the same foundation. Energy islands represent Europe’s next step toward a connected supergrid - where electricity does not simply flow, but is managed intelligently, securely and flexibly. Read the full article to explore the future of interconnected energy here: https://lnkd.in/dFh8H6YP #renewableenergy #energyhub #energyislands WHAT IS SIRIUS ENERGY? Sirius Energy is a Danish technical consultancy focused on renewable energy production, particularly biomass-fired power and heating plants, waste to energy, critical infrastructure, and technically high-reliability facilities. We pair hands-on “maskinmester” expertise with owner’s-representative during project execution to deliver dependable outcomes on demanding projects.

For more than half a century, SF₆ (sulphur hexafluoride) has been a key part of high-voltage power systems, valued for its excellent insulating and switching performance. But with a climate impact 23,000 times greater than CO₂, it’s being phased out as Europe moves toward climate-neutral energy. The transition to SF₆-free #technology is one of the most significant changes the power industry has seen in decades. THE PUSH TOWARD SF₆-FREE TECHNOLOGY: A GLOBAL EFFORT The EU is leading the shift away from SF₆, restricting its use through the F-Gas Regulation and accelerating the adoption of eco-efficient switchgear. SF₆-free solutions are already available for medium voltage and up to 145 kV, with higher-voltage systems in development. Similar moves worldwide, along with updated IEC and IEEE standards, show that SF₆-free technology is quickly becoming the new global standard. THE TECHNOLOGIES LEADING THE CHANGE SF₆ is being replaced by a new generation of eco-efficient insulating gases. Leading alternatives include: - Clean Air (N₂ + O₂) - g³ (Green Gas for Grid) - C5-PFK blends (fluoroketones) - CO₂ and N₂ Mixtures These solutions maintain high dielectric and switching performance while cutting global warming potential by more than 99% compared to SF₆ - enabling manufacturers to launch full SF₆-free GIS portfolios. HOW THE STANDARDS ARE EVOLVING Replacing SF₆ requires more than simply filling systems with a different gas. It requires new standards for design, testing, handling, and commissioning, ensuring the same or higher levels of safety and reliability. These standards ensure SF₆-free systems maintain trusted reliability while providing clear guidance for safely filling, testing, and monitoring new gases. WHAT THE TRANSITION MEANS FOR UTILITIES AND EPC CONTRACTORS Switching to SF₆-free systems impacts the full project lifecycle, from design and manufacturing to commissioning, operation, and documentation. It’s not just an environmental upgrade, but a fundamental shift in how engineering, HSE, and operations work together. WHY SIRIUS ENERGY IS FOCUSED ON SF₆-FREE COMMISSIONING At Sirius Energy Infrastructure, we support Europe’s transition to SF₆-free technology through safe installation, testing, and commissioning of high-voltage systems. Our #maskinmestre combine engineering, operational, and HSE expertise - a critical advantage as SF₆-free projects demand deeper equipment knowledge, updated gas-handling procedures, and rigorous QA before energisation. THE START OF A NEW STANDARD The move away from SF₆ is a once-in-a-generation transformation toward cleaner energy #infrastructure. With mature technology, clear regulation, and growing adoption across Europe, SF₆-free GIS is no longer the future - it’s happening now. Read the article here: https://lnkd.in/dUyjzsFK, and discover why moving away from SF₆ is a game-changer for power systems.

I går deltog Sirius Energy på Karrieredagen hos Teknika - Copenhagen College of Technology Management and Marine Engineering. Det var en stor fornøjelse at møde så mange nysgerrige studerende og fortælle om, hvad vores maskinmestre egentlig arbejder med. Mange blev overraskede over bredden i de roller og opgaver, vores maskinmestre varetager i vores 4 afdelinger - fra idriftsættelse af energianlæg og teknisk infrastruktur til komplekse bygninger og udvikling af nye tekniske løsninger. Samtalerne bekræftede også noget centralt ved maskinmesterrollen: At rådgivning og praksis skal hænge sammen. Flere studerende ønskede en rolle hvor man også skal være til stede ude på anlægget - side om side med håndværkerne - for at sikre, at de tekniske løsninger fungerer i virkeligheden. En anden ting, der bekræftede det fantastiske ved uddannelsen, er den store diversitet blandt de studerende. Mange kommer med meget forskellige uddannelses- og erfaringsbaggrunde, men deler den samme interesse for teknik, drift og ledelse af komplekse anlæg. Tak til Teknika for et godt arrangement - og til alle jer, der kiggede forbi vores stand til en snak. Vi glæder os til at følge den næste generation af maskinmestre.

Yesterday, Sirius Energy participated in the Career Day at Teknika - Copenhagen College of Technology Management and Marine Engineering. It was a pleasure to meet so many curious students and talk about what our MASKINMESTRE/Marine Engineers actually work with in practice. Many were surprised by the breadth of roles and responsibilities our engineers take on across our four departments – from commissioning energy plants and critical infrastructure to complex buildings and the development of new technical solutions. The conversations also confirmed something central to the marine engineer role: advisory work and practical execution must go hand in hand. Several students expressed a strong interest in roles where engineers are also present on site – working side by side with technicians and craftsmen to ensure that technical solutions work in reality. Another thing that really highlights the strength of the education is the diversity among the students. Many come from very different educational and professional backgrounds, but share the same interest in technology, operations and the management of complex technical systems. Thank you to Teknika for a great event – and to everyone who stopped by our stand for a conversation. We look forward to following the next generation of marine engineers. #maskinmester #marineengineers #industrialengineering #careerday WHAT IS SIRIUS ENERGY? Sirius Energy is a Danish technical consultancy focused on renewable energy production, particularly biomass-fired power and heating plants, waste to energy, critical infrastructure, and technically high-reliability facilities. We pair hands-on “maskinmester” expertise with owner’s-representative during project execution to deliver dependable outcomes on demanding projects.

The #energysector is rapidly moving toward SF₆-free gas-insulated switchgear (GIS), using cleaner alternatives like g³, fluoroketones, and CO₂/N₂ blends. These systems reduce environmental impact but require updated installation, testing, and #commissioning practices. Sirius Energy prepared the article, which explains what it takes to commission SF₆-free plants safely and successfully, and how project owners can ensure a fully compliant, energisation-ready system. 1. COMMISSIONING SF₆-FREE GIS REQUIRES NEW PRACTICAL SKILLS Commissioning SF₆-free GIS isn’t just “the old tasks with a new gas.” Alternative gases need different handling, testing, and monitoring—from gas quality checks and compatible recovery equipment to updated pressure limits and alarm settings. Technicians must understand new density–temperature relationships and humidity limits. 2. PLANNING & PRE-COMMISSIONING: THE BASIS FOR A SAFE INSTALLATION Success starts before installation. Pre-commissioning includes reviewing manufacturer documentation, identifying gas-specific risks such as pressurisation hazards and potential oxygen displacement, verifying the availability of certified gas-handling and recovery equipment and preparing site-specific risk assessments. This groundwork keeps teams safe and efficient from day one. 3. INSTALLATION, GAS FILLING & TESTING ON SITE On-site, commissioning is hands-on. Gas filling must be controlled, leak testing uses sensitive detectors, and moisture, temperature, and density must stay within strict limits. All measurement results — pressure, purity, temperature, leak rate — must be recorded, verified, and traceable, forming part of the asset lifecycle documentation. 4. HSE IN THE SF₆-FREE ERA: NEW GASES REQUIRE NEW SAFETY PROCEDURES SF₆-free doesn’t automatically mean lower operational risk. Some SF₆-free gas systems operate at higher pressures, need ventilation planning, or produce different by-products. Sirius Energy’s MASKINMESTRE collaborate with HSE teams on risk assessments, emergency procedures, and safe work coordination, integrating safety into commissioning from the start. 5. SAFE-TO-ENERGISE: THE FINAL CHECK BEFORE ENERGISING The final step is the Safe-to-Energise process: validating all test results, completing final inspections, confirming access controls, securing HSE sign-offs, and obtaining client approval—creating a transparent, traceable chain from installation to operation. 6. RETROFITS: REPLACE SF₆ – WITHOUT REPLACING THE ENTIRE SYSTEM Retrofits offer a smart transitional strategy: existing GIS can be converted to SF₆-free gases with up to 90% reduced environmental impact. Sirius Energy supports these projects with site assessments, supervised evacuation and refilling, commissioning, and QA/HSE documentation. Read the article here: https://lnkd.in/djB3SWYp #maskinmester

#Europe is producing more renewable energy than ever, especially from offshore wind. The challenge is no longer making green power but using it efficiently. Grid limitations make this difficult, which is why energy islands are crucial for the future energy system. MORE GENERATION DOES NOT SOLVE A SYSTEM PROBLEM The European power system was designed for centralized, predictable generation within national borders. Today’s offshore, weather-dependent wind production does not fit this model and puts growing pressure on the system. WHEN ENERGY INFRASTRUCTURE BECOMES THE LIMITING FACTOR Offshore wind is produced far from demand centers and often in large volumes over short periods. When production exceeds grid capacity or drops suddenly, imbalances arise across the system. Poor system integration leads to curtailed renewable energy, grid congestion, large regional price differences, and challenges to security of supply. This is a system-level issue, not a problem with offshore wind technology. ENERGY ISLANDS AS A SYSTEM BUFFER IN THE EUROPEAN ENERGY SYSTEM Energy islands are not power plants but central infrastructure elements. They act as buffers between offshore wind farms and onshore grids, enabling better control, flexibility, and system stability. WHY MORE CABLES ARE NOT ENOUGH Traditional HVDC connections only link two markets and do not manage overall system complexity. Energy islands instead consolidate and manage complexity offshore, reducing the burden on national grids. BORNHOLM ENERGY ISLAND AS AN EXAMPLE Bornholm Energy Island is Europe’s first full-scale energy island, connecting offshore wind in the Baltic Sea to both Denmark and Germany. It improves wind utilisation, energy trading flexibility, and security of supply. ENERGY ISLANDS ARE A PREREQUISITE FOR THE FUTURE ENERGY SYSTEM As Europe electrifies transport, industry, and heating, the energy system must handle large volumes of variable power while remaining stable. Energy islands are essential to make a scalable, reliable European energy system possible. Read the full article prepared by Sirius Energy to gain insight into why Europe cannot integrate more offshore wind without energy islands here: https://lnkd.in/diBRvh2F #maskinmester #renewableenergy #energy #energyislands WHAT IS SIRIUS ENERGY? Sirius Energy is a Danish technical consultancy focused on renewable energy production and critical infrastructure, particularly biomass-fired power and heating plants, district energy, and high-reliability facilities. We pair hands-on “maskinmester” expertise with owner’s-rep execution to deliver dependable outcomes on demanding projects.