Services Pipelines Construction of natural gas pipelines and facilities. Power plants and electricity networks Construction of power plants and electricity networks. Water supply and sanitation Construction and installation of interior and exterior water supply and sanitation. Water treatment Wastewater treatment and water treatment. Heating Internal heating. Steam boiler plants Hot water and steam boiler plants. Biomass boiler plants Biomass boiler plants (briquettes, pellets, straw bales,wood, coal). Construction of building Construction of buildings with a height of up to two levels including finishing works. Landscaping Landscaping works.