Hoku Scientific, Inc. Reports Results for Fiscal Year 2009 and Fourth Quarter Ended March 31, 2009

Market Wire, June, 2009

Use of Non-GAAP Financial Information

To supplement Hoku Scientific's financial statements presented on a GAAP basis, the Company uses non-GAAP measures of net loss and net loss per share, which are each adjusted to exclude expenses relating to non-cash stock-based compensation, which the Company believes is appropriate to enhance an overall understanding of its past financial performance and its future prospects. As the Company uses SFAS No. 123(R) to calculate its non-cash stock-based compensation expense, it believes that it is useful to investors to understand how the expenses associated with the application of SFAS No. 123(R) are reflected on its statements of operations. The Company further believes that where the adjustments used in calculating non-GAAP net loss and non-GAAP net loss per share are based on specific, identified charges that impact different line items in the statements of operations (including cost of service and license revenue, research and development, sales, general and administrative expense), it is useful to investors to know how these specific line items in the statements of operations are affected by these adjustments. For its internal budgets and forecasting, the Company uses financial statements that do not include non-cash stock-based compensation expense. The presentation of this additional information is not meant to be considered in isolation or as a substitute for net loss or net loss per share prepared in accordance with GAAP. Whenever the Company uses such non-GAAP financial measures, it provides a reconciliation of non-GAAP financial measures to the most closely applicable GAAP financial measure. Investors are encouraged to review the related GAAP financial measures and the reconciliation of these non-GAAP financial measures to their most directly comparable GAAP financial measure.