It is using vacuum switching technology combined with clean air insulation instead of SF6.

What is a Blue Portfolio?

the Blue portfolio comprises different high-voltage products used in a substation using clean air as insulation medium instead of SF6.

What are the different types of high-voltage switchgear?

air-insulated switchgear (AIS) and gas-insulated switchgear (GIS)

What are the main benefits of using Blue GIS?

Zero greenhouse gases and Zero global warming potential; zero impact on healt and safety; virtually zero maintenance, training or reporting needed

How does Blue GIS compare to traditional gas-insulated switchgear?

Blue GIS contains no SF6 nor any other harmful F-gas or greenhouse gases. It uses vacuum technology with highest switching capability with Zero degradation and a wide temperature range

What are the key applications of Blue GIS in the power industry?

onshore and offshore substations up to 145 kV

What voltage levels and applications are supported by Blue high-voltage products?

onshore and offshore substations up to 145 kV

What are the maintenance requirements for Blue high-voltage products?

vacuum interrupter is maintenance-free (sealed for life). Blue circuit breakers and GIS have a maintenance schedule of 12 years for visual inspection and checks; first mayor inspection after 25 years

What makes Siemens Energy’s Blue high-voltage products environmentally sustainable?

Blue products contain no SF6 nor any other harmful F-gas or greenhouse gases.

What are the challenges associated with implementing Blue GIS?

The use of clean air requires a larger size of the GIS, which leads to higher space requirements and material costs. This can be compensated by installing a Low Power Instrument Transformer (LPIT).

Blue High-Voltage Products | SF6-Free Switchgear

Decarbonizing the energy industry is about more than switching to renewable sources. To achieve Zero Global Warming Potential (GWP), it's essential we make the transmission of power as clean and green as its generation. This means eliminating F-gases from electrical switchgear – particularly SF₆, a gas 24,300 times more climate-hostile than CO₂.

Our Blue portfolio uses clean air and vacuum switching technology instead. Zero F-gases, Zero toxicity and Zero harm to human health and the environment.

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Less global warming potential is not good enough. It has to be Zero, because 1% global warming potential is still global warming potential. It has to be Zero and it has to be now.

Our Blue products use vacuum switching technology and clean air insulation to produce Zero harmful emissions - and without having to compromise on performance or economic feasibility. With over 10 years of experience in high-voltage vacuum switching, we have been able to maintain outstanding levels of technical performance and low lifecycle costs while reducing our ecological footprint to an enormous extent. Blue is already the perfect choice for substation products. And with the help of our strong partnerships, we can develop and implement it even further and faster.

Collaboration is crucial in cutting climate-harming emissions – and the LIFE Blue project GIS 420 kV is the latest example of how this works in practice.

Backed by EU funding and in partnership with Elia, operator of the electricity transmission network in Belgium, the LIFE Blue project is set to demonstrate for the first time the economic viability of a climate-friendly and completely F-gas free 420 kV GIS.

At Siemens Energy, we see a partnership as much more than a simple supplier-client relationship. It goes way beyond the placing and delivery of an order. Rather, it's a dose alliance between both parties. We work together towards a shared goal, developing the end solution by exchanging ideas and expertise at every stage.

This collaborative, interactive approach is mutually beneficial. Solutions can be shaped to meet particular requirements and the optimal set-up is reached more quickly.

We delivered 160 8VM1 Blue Gis bays to this huge project off the coast of the Netherlands, which is capable of supplying up to three million Dutch households with green energy.

"Being CO₂-neutral is the future and the target for our customers in the offshore wind market, as well as for us at Siemens Energy." – Ann-Sofie Bonde Mortensen, Global Vertical Sales Manager Offshore Wind, Siemens Energy.

The digitally-enabled 145 kV 3AV1 Blue circuit breakers installed at the Hesseln substation incorporate Sensgear^TM, a cloud- based monitoring solution that provides data to improve grid operation, asset management and maintenance.

"The medium-term replacement of the insulating gas SF₆ is an essential component of the decarbonization strategy of our E.ON Group." – Dr. Markus Obergünner, Senior Vice President High Voltage Grid, Westnetz GmbH.

By combining real-time data acquisition, advanced analytics, and secure automation, Node delivers a holistic view of digital substation health and performance—across transformers, switchgear, AC protection, automation & control systems, keeping breakers, insulation, and gas systems healthy and predictable. Siemens Energy's Noedra Node detects anomalies early, reduce forced outages, and streamline maintenance across your installations.

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The Blue portfolio – a cleaner future

The technology transforming transmission

Nikola Jankulovski

A transformed plant transforming energy

The Blue portfolio

Not just Zero F gases, but Zero reduction in performance

Blue switchgear: leading the way, backed by the EU

The new net-zero 8VM3

Blue partnerships

Blue installations in operation

Hornsea 3: Clean switchgear technology for the world's largest offshore wind farm

At work in Netherland's largest wind farm

Bringing clean power to Bergen Port

A new substation for Netze BW

The first F-gas-free switchgear in Finland

Decarbonization through digitalization with Westnetz

Digital integration of gas-insulated switchgear

Substation digitalization

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