Whereas, HOKU and SANYO desire to amend the Supply Agreement as hereinafter set forth:

     This Amendment No. 3 to Supply Agreement (this “Amendment”) is effective as of December 28, 2007, by and between Hoku Materials, Inc., a Delaware corporation (“HOKU”), and SANYO Electric Co., Ltd., a Japanese corporation (“SANYO”).

     Whereas, Hoku Scientific, Inc. (“Hoku Scientific”) and SANYO are parties to that certain Supply Agreement dated as of January 17, 2007, as amended pursuant to that certain Amendment No. 1 to Supply Agreement dated as of May 18, 2007, and that certain Amendment No. 2 to Supply Agreement dated as of October 12, 2007 (collectively, the “Supply Agreement”); and Whereas, Hoku Scientific, Inc., has assigned all of its right, title and interest in the Supply Agreement to HOKU, its wholly-owned subsidiary, pursuant to that certain Assignment and Assumption Agreement dated as of September 5, 2007 by and between Hoku Scientific and HOKU; and

Whereas, HOKU and SANYO desire to amend the Supply Agreement as hereinafter set forth:

     Now, therefore, for good and valuable consideration, the receipt and adequacy of which are hereby acknowledged, HOKU and SANYO agree as follows:

1. Definitions. Capitalized terms not otherwise defined herein shall have the meaning set forth in the Supply Agreement.

2. Amendment of Section 9.4(b). Section 9.4(b) of the Supply Agreement is hereby amended to read as follows:

(b) HOKU is unable to complete the Financing on or before February 15, 2008.

3. Integration. Except for the amendments specifically set forth above, the terms of the Supply Agreement shall continue in full force and effect and survive the execution and effectiveness of this Amendment.

Page 1 of 2 SANYO Initials & Date: T. S. 28/12/2007

In Witness Whereof, HOKU and SANYO have executed this Amendment No. 3 to Supply Agreement as of the date first set forth above.

Page 2 of 2 SANYO Initials & Date: T. S. 28/12/2007