To promote education and advocacy through the culturally sensitive and environmentally sound use of sunlight and seawater for a sustainable future for Hawaii.

Founded as the Friends of NELHA in 2001, the KCS will continue to offer themed, weekday tours of Hawaii Ocean Science and Technology (HOST) Park’s research and cutting-edge industries for both visitors and Hawai‘i students.


We offer NELHA/HOST Park Tours on Mondays, Tuesdays, Wednesdays & Fridays at 10 AM, except holidays.

And now an all new offering, the Guided Coastal Natural History Tour on Wednesdays at 8 AM, except holidays.

BOOK here for either NOW!

If a particular date does not open for booking, it is because it is unavailable at this time.

For further questions call 808-329-8073 or email kcs@kcshi.org.


Keahole Center for Sustainability is located at the Natural Energy Laboratory of Hawaii Authority’s  HOST Park (Hawaii Ocean Science & Technology Park). HOST Park serves as a business incubator, research facility, and center for economic development–offering the opportunity for organizations using sea water, sunshine, and ingenuity to perform research, engage in conservation and education activities, and produce sustainable commercial products.


My two sons and I visited the Keahole Center for Sustainability (KCS) this past July and had THE MOST inspiring visit with Candee and Randal. From the moment we stepped into the Center right through to the end of the tour of the Hawaii Ocean Science and Technology Park, we were deeply engaged and truly moved by Candee and Randal’s passion for local sustainability, the awe-inspiring innovation of NELHA, and the deep dive, multi-sensory learning about dual-temperature systems and ocean thermal energy conservation. Candee and Randal shared, in the most accessible and thoughtful way, the innovations in green technology taking place at HOST, and our minds were collectively blown by the creativity being actualized on-site through your organization. KCS is an absolute treasure, and the tour is my first recommendation to absolutely everyone I know who is visiting The Big Island. Our visit with Candee and Randal was the highlight of our summer trip, and I will send a donation to KCS to show my appreciation.  I look forward to visiting and touring again on my next trip to Kona.  -Victoria Sutton Jul 2021 (Cambridge, Massachusetts)

Visiting NELHA was literally the high point of our trip to the Big Island. These research groups are doing fascinating and admirable work and are showing us the way to the future in sustainable energy, agriculture, and aquaculture. The tour made us wish that we were young again and able to choose our career paths here. -Bj N

We loved this. The tour was incredibly interesting. NELHA is doing some amazing work. Visiting the charter school was very cool and made us want to go back to school (one of that type of course..) Definitely a very cool activity to do in Kona. -Smoll1