The project will demonstrate technologies to cost-effectively convert biomass into advanced drop-in biofuels.

OMAHA, Neb., April 22, 2013 -- BioProcess Algae LLC has

been selected to receive a grant of up to $6.4 million from the U.S.
Department of Energy (DOE), as part of an innovative pilot-scale biorefinery
project related to production of hydrocarbon fuels meeting military
specification. The project will use renewable carbon dioxide,
lignocellulosic sugars and waste heat through BioProcess Algae's Grower
Harvester(TM) technology platform, co-located with the Green Plains
Renewable Energy, Inc. (Nasdaq:GPRE) ethanol plant in Shenandoah, Iowa.

"BioProcess Algae was the only algae platform chosen to be a part of this
project by the DOE," said Todd Becker, President and CEO of Green Plains.
"This project will link our commercial scale platform for growing and
harvesting algal biomass with technology partners for conversion into
advanced biofuels. While this is a project for the development of drop-in
biofuels, we continue to focus our technology for growing and harvesting
algae for feed, food or fuel."

"We believe our Grower Harvester platform will be vital in the development
of this project with the DOE," added Tim Burns, President and CEO of
BioProcess Algae. "For this project, we will integrate low-cost autotrophic
algal production, accelerated lipid production, and lipid conversion in an
effort to develop a cost-effective advanced biofuel for military needs. This
development is consistent with our current plans to build the next phase of
Grower Harvester reactors in Shenandoah."

The project will demonstrate technologies to cost-effectively convert
biomass into advanced drop-in biofuels and the recipient is required to
contribute a minimum of 50% matching funds for the project.

About BioProcess Algae LLC

BioProcess Algae LLC is a joint venture among CLARCOR Inc. (NYSE:CLC), a
global provider of filtration products, BioProcessH2O LLC, a wastewater
purification technology company, and Green Plains Renewable Energy.
BioProcess Algae was created to commercialize advanced photo-bioreactor
technologies for growing and harvesting of algal biomass.

About Green Plains Renewable Energy, Inc.

Green Plains Renewable Energy, Inc. (Nasdaq:GPRE) is North America's fourth
largest ethanol producer, which markets and distributes approximately one
billion gallons of ethanol annually. Green Plains owns and operates grain
storage assets in the corn belt and biofuel terminals in the southern U.S.
Green Plains is a joint venture partner in BioProcess Algae LLC, which was
formed to commercialize advanced photo-bioreactor technologies for growing
and harvesting algal biomass.