HONOLULU, HI–(EMWNews – August 4, 2008) – Prudential Locations, LLC, Hawaii’s largest

locally owned and operated real estate company, announced today that it has

selected Hoku Solar, a wholly owned subsidiary of Hoku Scientific, Inc.

(NASDAQ: HOKU) that designs, engineers and installs turnkey photovoltaic

(PV) power systems, to install a PV power system on Prudential Locations’

Oahu headquarters.

Hoku Solar plans to install an 87-kilowatt PV system at Prudential

Locations’ Kapahulu Avenue office building. The system is expected to

generate more than 136,000 kilowatt hours of clean, solar electricity each

year. The solar power project is part of an ongoing renovation of

Prudential Locations’ flagship office and contributes directly toward the

company’s corporate sustainability initiative.

Once installed, Prudential Locations’ PV system is expected to produce

enough electricity over its lifetime to power the equivalent of three

hundred eighty-two homes for one year. Environmentally, it is expected to

offset nearly 2,160 tons of carbon dioxide emissions — the equivalent of

removing more than 139 cars from Hawaii’s roadways.

“Hoku is pleased to partner with Prudential Locations to complete this

important project,” said Dustin Shindo, chief executive officer of Hoku

Scientific. “Not only does PV make good business sense in Hawaii,

Prudential is showing great community leadership by investing in clean,

renewable energy for their Honolulu offices.”

“Our collaboration with Hoku to invest in new, innovative technology is one

of many sustainability efforts that allow us to do our part to reduce our

environmental footprint,” said Bill Chee, president and CEO of Prudential

Locations. “We view this as a long-term partnership between our companies,

and it is clear that Hoku shares Prudential’s focus on exemplary customer

service.”

About Hoku Scientific, Inc.

Hoku Scientific (NASDAQ: HOKU) is a diversified clean energy technologies

company with three business units: Hoku Materials, Hoku Solar and Hoku Fuel

Cells. Hoku Materials plans to manufacture, market, and sell polysilicon

for the solar market from its plant currently under construction in

Pocatello, Idaho. Hoku Solar is marketing and plans to install turnkey

photovoltaic systems in Hawaii. Hoku Fuel Cells has developed proprietary

fuel cell membranes and membrane electrode assemblies for stationary and

automotive proton exchange membrane fuel cells. For more information visit

www.hokuscientific.com.

About Prudential Locations

Prudential Locations, LLC is a multi-faceted real estate company with a

rich kama’aina tradition in the islands of Hawaii that boasts more than

three decades of extensive local experience and connections to offer its

clients. To benefit customers, the Prudential Locations website,

www.PrudentialLocations.com, shows every home, land, condo and real estate

listing on Oahu, Maui, Big Island, Kauai, Molokai, and Lanai, with detailed

property information to assist its clients. By being a leader in real

estate market research and knowledge and continually training more than 280

real estate agents, Prudential Locations produced more than $1 billion in

sales in 2007. Prudential Locations Hawaii is ranked in the top 4 percent

of all Prudential Real Estate affiliates and recently earned the

distinction of Hawaii’s top brokerage firm for both transactions and sales

volume by the RIS 2008 Power Broker Survey. Prudential Locations was

established in 1969 with offices and affiliates throughout the state, and

is an independently owned and operated member of the Prudential Real Estate

Affiliates, Inc.

Forward-Looking Statements

This press release contains forward-looking statements that involve many

risks and uncertainties. These statements relate to Hoku’s ability to

successfully complete the photovoltaic (PV) installation for Prudential

Locations; the expected performance and durability of Hoku’s PV system;

Hoku’s future financial performance; Hoku’s business strategy and plans;

and objectives of management for future operations. In some cases, you can

identify forward-looking statements by terms such as “anticipate,”

“believe,” “can,” “continue,” “could,” “estimate,” “expect,” “intend,”

“may,” “plan,” “potential,” “predict,” “project,” “should,” “will,” “would”

and similar expressions intended to identify forward-looking statements.

These statements involve known and unknown risks, uncertainties and other

factors that may cause Hoku’s actual results, performance, time frames or

achievements to be materially different from any future results,

performance, time frames or achievements expressed or implied by the

forward-looking statements. Given these risks, uncertainties and other

factors, you should not place undue reliance on these forward-looking

statements. In evaluating these statements, you should specifically

consider the risks described in Hoku’s filings with the Securities and

Exchange Commission. Except as required by law, Hoku assumes no obligation

to update these forward-looking statements publicly, or to update the

reasons actual results could differ materially from those anticipated in

these forward-looking statements, even if new information becomes available

in the future.

For more information contact: Hoku Scientific, Inc. 808-682-7800 Bennet Group PR Monica Salter 808.531.6087 ext. 102