Switchgear protects the grid by switching circuits and clearing faults. Traditional switchgear uses Sulfur Hexafluoride (SF6), the most potent greenhouse gas known to man (23,500 times more warming potential than CO2). For years, SF6 was irreplaceable because of its excellent insulating properties.
The Breakthrough: Siemens Energy has commercialized the Blue GIS portfolio—switchgear that uses "clean air" (a mixture of natural gases, primarily nitrogen and oxygen, with fluoroketone) as an insulating medium.
This is not a science experiment; it is a commercially available, IEC-tested product line ranging from 8.8 kV to 145 kV, with higher voltage classes on the way. For utilities under pressure to report Scope 1 emissions, switching to Siemens Energy’s Blue GIS is the fastest win available. grid technologies siemens energy
One hidden consequence of retiring coal and gas plants is the loss of "inertia." Inertia is the kinetic energy stored in spinning turbines that keeps the grid frequency stable (50 or 60 Hz). Wind and solar inverters do not provide natural inertia.
Siemens Energy has revived the synchronous condenser for the renewable age. A synchronous condenser is essentially a large electric motor that spins freely, providing: Grid Technologies — Siemens Energy Pillar 2: Gas-Insulated
In 2023-2024, Siemens Energy delivered the world’s largest synchronous condenser units to the UK’s National Grid and to South Australia—regions that are on the cutting edge of renewable penetration (over 70% at times). These massive machines (weighing hundreds of tons) are the invisible muscle that keeps the lights on when the wind stops blowing.
One of the biggest headaches for renewable energy is "inertia." Traditional power plants have spinning turbines that naturally stabilize the grid frequency. Solar panels and batteries don't spin. If you remove all the heavy spinning machines, the grid becomes jittery and prone to collapse. Performance: Zero global warming potential (GWP = 1)
Siemens Energy has cracked this code with Siemens Energy SIESTART and static synchronous compensators (STATCOMs). These devices act like electronic flywheels. They inject or absorb reactive power in microseconds to keep the voltage steady.
The Case Study: On the island of Ireland (which has a weak, isolated grid), Siemens Energy installed technology that allows the grid to run up to 75% of the time on renewable energy without conventional power plants. They proved you can have a stable, blue (renewable) island without blackouts.
Beyond functionality, Siemens Energy embeds sustainability into the lifecycle of its grid products. They are actively working to replace SF6 (Sulfur Hexafluoride)—a potent greenhouse gas traditionally used as an insulating medium in switchgear—with environmentally friendly alternatives like "Blue" portfolios, which use clean air mixtures. This innovation ensures that the infrastructure supporting the green transition is green itself.