- Transmission grid operator to install world’s first 420 kV 63 kA Green Gas for Grid (g³) gas-insulated line and busbars (GIL/GIB) operating at -30°C
- GE’s g³ technology is a game-changing alternative to sulphur hexafluoride (SF₆), an insulating and switching gas traditionally used in substation equipment and the most potent greenhouse gas in the world
- GE’s g³ technology to help Statnett meet its goal of reducing its greenhouse gas emissions by 25 percent in 2025
Oslo, NORWAY February 23, 2021 – Norway’s transmission grid operator Statnett announced it will install the world’s first 420 kilovolt (kV) 63 kiloampere (kA) GE Green Gas for Grid (g³) gas-insulated line (GIL) and busbars (GIB) operating at -30°C within its new 420 kV Hamang substation located in Oslo’s Sandvika area.
That makes Norway the eighth country in Europe to adopt g³ (pronounced “g-cubed”) technology, a game-changing alternative to sulphur hexafluoride (SF₆), an insulating and switching gas traditionally used in high-voltage substation equipment. Identified as the world’s most potent greenhouse gas by the 1997 Kyoto Protocol, SF₆ is estimated to contribute 23,500 times more emissions than CO₂, if leaked, and can remain in the atmosphere for up to 3,200 years.
“As a responsible grid operator, we are determined to play our part in reducing our greenhouse gas emissions. Emissions of SF₆ gas are Statnett's largest source of direct greenhouse gas emissions. Even though Statnett closely monitors SF₆ switchgear with advanced monitoring, natural leaks from these plants are today’s single source of emissions from the company's operations, that has the greatest harmful effect on the climate,” said Guilhem Blanchet, responsible for GIS technology at Statnett. “Our goal is to reduce our emissions by 25 percent in 2025. The use of GE’s g³ technology for our new 420 kV Hamang GIS substation, a key substation in the upgrade of the transmission network in and around Oslo, is an important step in supporting this goal.”
“g³ is part of GE’s broader efforts to help the electric transmission and distribution industry reduce its greenhouse gas emissions. Together, Statnett and 21 other utilities in Europe are avoiding the addition of more than one million tons of CO₂ equivalent to the grid by deploying g³. That’s the equivalent of removing about 476,000 petrol cars from the road for one year,” said Bertrand Portal, g³ Product Manager at GE’s Grid Solutions.
Gas-insulated line installations from eight major European electrical utilities account for two-thirds of this reduction. Statnett alone is expected to avoid the installation of an additional 24,000 tons of CO₂ equivalent to the Norwegian grid.
g³ has been identified as an alternative to SF₆ for use in high-voltage equipment in a report published by Norway’s Water Resources and Energy Directorate (NVE) in October 2019. This was confirmed by the EU Commission in a similar report published in September 2020, which concluded there are cost-effective, technically feasible and energy efficient alternatives to SF₆. The EU also highlighted that g³, unlike any other SF₆ alternatives, is the solution when space is a constraint as g³ products feature the same compactness and performance as traditional SF₆ equipment.
g³ products also have a greatly reduced impact on the environment over their lifetime compared with other solutions, according to life-cycle assessments (LCAs), based on international ISO 14040/14044 standards.
To further support Norway’s move to SF₆ alternatives, GE’s Grid Solutions will participate in Norway’s independent Research Institute’s Sintef study on alternative gases.
GE’s game-changing g³ technology is a culmination of a decade of research and development by its teams in France, Germany and Switzerland in collaboration with 3M Company. g³ products are available for live-tank circuit-breaker and gas-insulated substations (GIS) up to 145 kV and gas-insulated lines (GIL) up to 420 kV. A g³ 420 kV gas-insulated substation circuit-breaker is under development with financial support from the EU as part of its LIFE Programme.
Notes to Editor
Gas-insulated lines (GILs) serve as connections between gas-insulated substation (GIS) switchgear and power transformers or overhead lines. Gas insulated busbars connect two adjacent GIS switchgear.
Statnett is the system operator of the Norwegian transmission grid, owning approximately 150 substations and more than 12,000 km of overhead lines. Statnett operates the transmission grid and maintains the balance between consumption and production, providing a reliable power supply at all times, visit www.statnett.no.
About GE’s Grid Solutions
Grid Solutions, a GE Renewable Energy business, serves customers globally with over 13,000 employees in approximately 70 countries. Grid Solutions helps enable utilities and industry to effectively manage electricity from the point of generation to the point of consumption, helping to maximize the reliability, efficiency and resilience of the grid. For more about GE Renewable Energy’s Grid Solutions business, visit www.gegridsolutions.com.
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