Information Security Education Journal Aleksandra Krkoleva Mateska, Petar Krstevski, Stefan Borozan 7 1 2020 https://doi.org/10.6025/isej/2020/7/1/16-22 https://www.dline.info/isej/fulltext/v7n1/isejv7n1_3.pdf The paper describes the practices for protection of information, control systems and assets by transmission system operators (TSOs) in the region of South-East Europe (SEE). Based on a survey undertaken among the TSOs of the SEE region, the paper indicates state of the art practices and future developments related to critical infrastructures in electricity transmission networks.