Ascent Solar Announces Exercise of Over-Allotment Option

LITTLETON, Colo.--(Business Wire)--
Ascent Solar Technologies, Inc. (NASDAQ:ASTI) today announced that
the underwriters of its public offering exercised their over-allotment
option to purchase an additional 570,000 shares of its common stock at
$14.00 per share, before deducting underwriting discounts and
commissions. The option was granted in connection with the company's
public offering of 3,800,000 shares of its common stock, which priced
on May 15, 2008.

J.P. Morgan Securities Inc. is serving as managing lead
underwriter of the offering. Cowen and Company, LLC, Jefferies &
Company, Inc. and Merriman Curhan Ford & Co. are serving as
co-managers of the offering, and Janco Partners, Inc., Maxim Group LLC
and Signal Hill Capital Group LLC also are serving in the underwriting
group. The offering is being made solely by means of a prospectus. A
copy of the final prospectus, when available, may be obtained by mail
to J.P. Morgan Securities Inc., National Statement Processing,
Prospectus Library, 4 Chase Metrotech Center, CS Level, Brooklyn, New
York 11245, or by calling J.P. Morgan Securities Inc. at
1-718-242-8002.

This press release shall not constitute an offer to sell or a
solicitation of an offer to buy, and there shall not be any sale of
these securities in any state or jurisdiction in which such offer,
solicitation or sale would be unlawful prior to registration or
qualification under the securities laws of any such state or
jurisdiction.

About Ascent Solar Technologies, Inc.

Ascent Solar Technologies, Inc. is a developer of thin-film
photovoltaic modules and is located in Littleton, Colorado.

Forward-Looking Statements

Statements in this press release that are not statements of
historical or current fact constitute "forward-looking statements."
Such forward-looking statements involve known and unknown risks,
uncertainties and other unknown factors that could cause the Company's
actual operating results to be materially different from any
historical results or from any future results expressed or implied by
such forward-looking statements. In addition to statements that
explicitly describe these risks and uncertainties, readers are urged
to consider statements that contain terms such as "believes,"
"belief," "expects," "expect," "intends," "intend," "anticipate,"
"anticipates," "plans," "plan," 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 filings with the Securities and Exchange
Commission.

Ascent Solar Technologies, Inc.
Brian Blackman, 832-515-0928 (Investor Relations)
bblackman@ascentsolar.com
or
Brand Fortified Public Relations
Kelly Brandner, 303-289-4303 (Media)
kellybrandner@msn.com

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