Waste is generally reported on the basis of invoices received from waste recipients, supplemented with plant-specific measurement methods for commercial facilities, including construction activities. Part of the oil-contaminated wastewater from the North Sea oil pipeline has been treated as waste and therefore reported as waste and not wastewater. Residual products, e.g., gypsum from the CHP plants, which are not handled as waste but sold as products, are not included. Soil from excavation projects is not included.