Request a Tour Appointment

OTEC Okinawa welcomes visitors to tour the OTEC Facility and Deep Sea Water Research Institute. We ask you make a reservation to ensure we have a staff member available to guide you and answer questions. Please make a reservation via the form below. Native English speaking and Japanese speaking guides are available. Normal operating hours are Monday through Friday from 9 am to 5 pm. We may be able to accomodate special requests for Saturday and Sunday tours as well. Tours are free.



Currently, the OTEC facility is not in operation due to the completion of the primary project goals, however, tours are still possible.


Native English language tours will be unavailable August 20-26, 2019. Thank you for your understanding and cooperation.


If you are unable to access the form above, feel free to email benjamin [at] with your tour request and we will get back to you as soon as possible. We will always email you to confirm your appointment. If you do not recieve an reply within 4 days please check your spam folder or resend your application.

Visiting the OTEC Facility provides information and hands-on experience for any level of interest. For those with technical inquiries you may request an engineer be present but availablity is limited. Tours can be tailored to your time restraints and interest but generally include a brief presentation followed by a tour of the OTEC facilty and the Okinawa Deep Seawater Research Center. Please be aware that the facility is closed on national holidays, weekends, and during times of incliment weather, however, we may be able to make special arrangements if necessary.

Contact Us

For any other questions you might have, please use the form below. Please note that we will reply to the email address asap. If you do not see an email from us within 3 days, please check your spam folder.

Facility Location

OTEC Okinawa is located on the Okinawa Prefecture Deep Seawater Research Center Grounds in the Maja area of Kume Island.

Address: 500-1 Maja, Kumejima-cho Shimajiri-gun, Okinawa 901-3104, Japan

Phone: +81 98-896-8655 (Ask for Benjamin Martin)

Email: benjamin [at]

Operating Company Information

Address: Xenesys, Inc., 6F Z Building, 7-10-1 Kameido, Koto-ku, Tokyo 136-0071, Japan

Phone: 03-6441-2153

Email: info [at]

"Power Generation Demonstration Project for the Avanced Use of Deep Seawater"

Okinawa Prefecture Industrial Policy Division

Address: Administrative Building (north side), 1-2-2 Izumizaki, 8th Floor, Naha, Okinawa, 900-8570, Japan

Phone: 098-866-2330

Current Surface Seawater Temperature


Current Deep Seawater Temperature


(Updated 7/30/2019)

©2013-2019 Okinawa Prefecture.