Honolulu-based Hoku Corp. said chief financial officer Darryl Nakamoto has resigned effective March 31, 2012.

Nakamoto had been the alternative energy company’s CFO since 2005. Nakamoto’s key accomplishments were managing the company’s initial public offering in 2005 and helping bring in Chinese investors who took control of the struggling company in 2009.

“As we have moved from a start-up to an emerging growth company I feel that now is the right time for me to move on to my next challenge,” Nakamoto said in a news release. “