  Ontologies are critical sources of semantic information for many application
domains. Hence, there are ontologies proposed and utilized for domains such as
medicine, chemical engineering, and electrical energy. In this paper, we
present an improved and extended version of a wind energy ontology previously
proposed. First, the ontology is restructured to increase its understandability
and coverage. Secondly, it is enriched with new concepts, crisp/fuzzy
attributes, and instances to increase its usability in semantic applications
regarding wind energy. The ultimate ontology is utilized within a Web-based
semantic portal application for wind energy, in order to showcase its
contribution in a genuine application. Hence, the current study is a
significant to wind and thereby renewable energy informatics, with the
presented publicly-available wind energy ontology and the implemented
proof-of-concept system.
