Safety is a team game

This year marks an important milestone in the development of the main grid. Both the Forest Line, the Oulujoki and North Karelia project entities will be completed and...


Behind the numbers


Biodegradable ester oil for transformers?

A high-voltage transformer in the main grid may contain as much as 100 tonnes of mineral oil, which is used as an electrical insulator and cooling medium. The environmental risks associated with transformer oils are very unlikely to be realised, but it is still necessary to make contingencies for them.