A SKOS concept scheme defining bidding zones used in the Nordic and European electricity markets, as applied by Svenska Kraftnät. The scheme includes concepts for Swedish bidding zones (SE1–SE4), the Nordic system price, and interconnected zones such as Norway, Denmark, Finland, the Baltic states, Poland, and Germany-Luxembourg. Each concept is provided with identifiers, multilingual labels, alternative labels, and definitions. The scheme supports consistent identification and exchange of geographical market areas across systems and data domains.