238kV, underground hydro plant, Sweden Customer: Vattenfall AB Location: Stalon Hydropower Station, Sweden Application: GSU Power Transformer Highest Voltage: 238kV Rating: 135MVA Date: 2004 In 2002 Vattenfall AB identified a need for a new transformer for their underground hydropower station Stalon, located between Lake Malgomaj and Lake Kultsjön by the Ångermanälven River in northern Sweden. There were certain issues that meant a mineral oil transformer was not a desirable option. Firstly the transformer was to be placed underground, so fire safety was critical, secondly, and just as importantly, the power station was located in an environmentally sensitive area, where spillage of mineral oil could cause large amounts of damage. When the transformer was put out for tender VA Tech (now Si

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