Finland’s Fingrid to construct new 400/110 kV substation in Hepokorpi district May 16, 2022 | Europe News Finland’s transmission system operator (TSO), Fingrid, is planning to construct a new 400/110 kV substation for the main grid in the Hepokorpi district of Espoo. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password