Harju Elekter Harju Elekter or Harju Elekter Group is Estonian concern which deals mainly with manufacturing of MV/LV electrical equipment. or Harju Elekter Harju Elekter or Harju Elekter Group is Estonian concern which deals mainly with manufacturing of MV/LV electrical equipment. Group is Estonian concern which deals mainly with manufacturing of MV/LV electrical equipment. The group has been listed in Nasdaq Tallinn Tallinn, the largest city and capital of Estonia (population 440 000). Stock Exchange.