Gevo Brings Second Million-Liter Fermenter and GIFT(R) System Online

Gevo will sell the isobutanol it produces in the specialty chemicals and specialty oxygenated fuel blendstock markets

ENGLEWOOD, Colo., Aug. 1, 2013 -- Gevo, Inc.

(Nasdaq:GEVO), the world's only commercial producer of bio-based isobutanol,
today announced that it has brought its second million liter fermenter and
GIFT(R) system online at its Luverne, Minn.
facility.

"We have been successful in operating full-scale fermentations using our
GIFT(R) system -- which separates the isobutanol from the fermentation broth
-- on a second million-liter fermenter and GIFT system," noted Patrick
Gruber, Gevo's chief executive officer. "This serves to further validate our
technology and plant know-how. We plan to bring the final fermenters and
GIFT(R) system online at Luverne later this year, testing run rates, then
ramping up production and sales over the balance of 2013 and in 2014."

Dave Vander Griend, ICM's chief executive officer, said, "We're pleased to
congratulate Gevo on their exciting announcement. Through our collaboration
over the years, ICM has supported Gevo's efforts to become the global first
commercial producer of renewable isobutanol. We were thrilled to test Gevo's
GIFT(R) technology at our pilot plant in St. Joseph, Mo., in addition to
constructing new portions of their facility in Luverne. In doing this, it
enabled us to implement a model of retrofitting existing assets and
implementing new technology with broad market capabilities. Our combined
efforts enabled us to support Gevo in bringing their first million-liter
fermenter online, and then achieving the next critical step of bringing a
second fermenter online, which we're celebrating today."

Gevo will sell the isobutanol it produces in the specialty chemicals and
specialty oxygenated fuel blendstock markets, and use it as a building block
to make jet fuel and chemical products, such as paraxylene, which is
converted into PET and used in the production of bottles and fibers.

About Gevo

Gevo is a leading renewable chemicals and next-generation biofuels company.
Gevo's patent-protected, capital-light business model converts existing
ethanol plants into bio-refineries to make isobutanol. This versatile
chemical can be directly integrated into existing chemical and fuel products
to deliver environmental and economic benefits. Gevo has executed initial
commercial-scale production runs at its isobutanol facility in Luverne,
Minn., constructed in conjunction with ICM, a leading provider of
proprietary ethanol process technology, and has a marquee list of partners
including The Coca-Cola Company, Sasol Chemical Industries, and LANXESS,
Inc., an affiliate of LANXESS Corporation, among others. Gevo is committed
to a sustainable bio-based economy that meets society's needs for plentiful
food and clean air and water. For more information, visit www.gevo.com.

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