To ensure the quality and reliability of supplied electric energy, a digital protection MainsPro for network supervising has been installed in the power plant since 2010. MainsPro is fitted in a metal box with the door from an old electromechanical protection unit to keep the look in an original and undisturbed way in regards to the 3kV switchboard history. The main protection function is to watch the tension and frequency for the 3kV distribution and also the shutting down the generator in case of breakdown.