Daugavpils wastewater treatment plant modernisation was undertaken to reduce the pollution and odour of the River Daugava and the Baltic Sea, which was sensed in the city near the location of the wastewater treatment plant. Wastewater treatment plant expansion and modernisation was conducted with co-financing from the European Union Cohesion fund for the Water Management Development in Daugavpils, Phase II. The project went on for nearly a year, within which we undertook complicated electro-installation assembly works. Assembly of an automatic control system MCC was carried out and tested, power and control cable constructed over the whole area, connecting remote mechanical equipment to the control system – pumps, motors, fans, sensors, centrifuges and others. During the work, our specialists introduced a series of innovative and effective solutions, earning the customer praise and proving itself to be a high quality business, which can be relied on in implementing technically complicated projects.