ClassNK Renewable Energy

In order to support the industry's growing needs for renewable energy technologies, ClassNK provides certification and a third-party verification services of diverse renewable energy facilities. ClassNK is contributing towards the creation of low carbon societies both in Japan and abroad through these services.

What's New

June. 1, 2026

Registration of Type Certification for Small Wind Turbines updated (as of June. 1, 2026)

Apr. 1, 2026

Registrations of Wind Farm Certification updated (as of March 31, 2026)

Type Certification for Wind Turbines
Wind Farm Certification
Classification Survey for Floating Offshore Wind Turbines
Technical Services for Renewable Energy
GWO Training Certification
Guidelines / Publications

Address and Contact Details

NIPPON KAIJI KYOKAI Renewable Energy Department
4-7 Kioi-cho, Chiyoda-ku, Tokyo 102-8567, Japan
Tel: +81-3-5226-2032
Fax: +81-3-5226-2060
email: re@classnk.or.jp