The project involved the energy retrofit of the EL-TO power plant, which supplies electricity and district heating to the city of Zagreb. To bring the plant up to current environmental standards, a new combined cycle gas turbine (CCGT) cogeneration unit was installed.

The plant is equipped with the Rainplus syphonic drainage system with 29 roof outlets. The metal structure and the positioning of the outlets at a height of 30 to 40 metres made it a significant technical challenge; the support of the partners CEV Instalacije and MANS was crucial.

What it shows for a Finnish project

On the large roof of an industrial hall the number and placement of the rainwater outlets are decided at the design table. According to Valsir, the Rainplus syphonic rainwater system is sized for extreme rainfall and protects the building in extreme weather.