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Neah Power Announces Successful Test of 16-Cell Fuel Cell Stack
Company Reaches Important Milestone on Path to Commercial Product

June 28, 2007

BOTHELL, Wash. Neah Power Systems, Inc. (OTCBB:NPWS – News), a leading developer of fuel cells for military applications, notebook computers and portable electronic devices, announced today that it has successfully tested a 16-cell version of its silicon-based fuel cell stack. Using Neah Power’s patented silicon technology, the stack produced greater power density than any known competitive technology under similar conditions. The successful test is a major milestone toward completion of a commercial fuel cell prototype.

The 16-cell stack produced over 7 watts of power at room temperature, which can be expected to increase significantly at typical fuel cell operating temperatures. “Successful operation of the stack—which is the fundamental component of power generation—is generally considered to be the main engineering hurdle to completion of a fuel cell,” said John Drewery, Executive Vice President of Engineering.

The success of the 16-cell stack test shows that Neah Power’s unique porous silicon electrode architecture will produce power at the level needed for commercialization. “This is an essential step that we have been building toward for many months,” said Paul Abramowitz, President and CEO. “Our team’s achievement keeps us on track to deliver our fuel cell prototype in the 3rd quarter of this year.”

Neah Power’s patented silicon technology will more than double the known power densities of any competing direct methanol fuel cell. With this and its other patented technological advantages, Neah Power will be uniquely positioned to compete with both alternative fuel cells and lithium ion batteries.

About Neah Power Systems

Neah Power Systems is a micro fuel cell development company using a patented, silicon-based design to provide long-lasting, efficient and safe power solutions for portable electronic devices, including notebook PCs and other power-hungry computer, entertainment, and communications products. As an emerging leader in fuel cell technology and design, Neah Power Systems believes that its products will allow users to extend the operating time of their devices multiple times beyond that of conventional batteries. Key investors include Alta Partners, Frazier Technology Ventures, Castile Ventures, WestAM and Intel Capital. Neah Power Systems is headquartered just outside of Seattle in Bothell, Washington. Further company information can be found at our Website www.neahpower.com and in the reports that we file with the Securities and Exchange Commission, which are accessible at www.sec.gov.

Statements in this press release that are not statements of historical or current fact constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements involve known and unknown risks, uncertainties, and other unknown factors that could cause the actual results of the Company to be materially different from the historical results or from any future results expressed or implied by such forward-looking statements. In addition to statements which explicitly describe such risks and uncertainties, readers are urged to consider statements labeled with the terms “believes,” “belief,” “expects”, “intends”, “anticipates”, “will”, or “plans” to be uncertain and forward-looking. The forward-looking statements contained herein are also subject generally to other risks and uncertainties that are described from time to time in the Company’’s reports and registration statements filed with the Securities and Exchange Commission.

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