Hoku Corporation is a solar products and services company operating three businesses: Hoku Materials, Hoku Solar, and Tianwei Solar USA.

Hoku Materials manufactures, markets and sells polysilicon for the solar industry from its plant currently under construction in Pocatello, Idaho.

Hoku Solar delivers investment-grade solar power for commercial, institutional and utility clients.

Tianwei Solar USA markets and sells photovoltaic modules manufactured by Tianwei New Energy.