Finland’s TSO plans 400 kV switching substation for off-shore power February 19, 2009 | Europe News Finnish electricity transmission system operator Fingrid plans to set up a new 400 kV switching substation in the area of Yli-Ii and Yli-Olhava for electricity from off-shore power units. This content is available to only paying subscribers. Username or E-mail Password Remember Me Forgot Password