Nā ʻōiwi
ʻIke ʻia nā kālā kūleʻa me ke kūleʻa e pākiʻi ai i ke kaha, e hoʻomaikaʻi ai i ke kaha ʻana i ka māka o ka hana ʻana i ka lepe. ʻO kēlā me kēia mea maikaʻi loa e hoʻohana paha i nā pōhaku hihi, ʻāina kū kū, a me nā mea kūkū hana. ʻO kā lākou ola kūleʻa he 30% loa a o nā kālā kūleʻa hydraulically.