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Insulation upgrade of existing 300 kV power line to 420 kV.

Statnett is currently upgrading the voltage level from the existing 300 kV to 420 kV power lines in the main grid. The purpose is to strengthen security of supply in Southern Norway, and to facilitate increased use of power in the region. The current substation in Kristiansand (Vennesla) will also be expanded on the Kristiansand-Bamble section and a new substation will be built in Arendal (Froland) and Bamble.