PetroSun Teams With SAIC on Algae-to-Jetfuel

SCOTTSDALE, AZ, Apr 22 (MARKET WIRE) --
PetroSun, Inc. (PINKSHEETS: PSUD) announced today the algae-to-jetfuel teaming
relationship with Science Applications International Corporation (SAIC). The
companies
are working to transition algal biofuel technology to the commercial sector for
government contracts.

PetroSun has made twenty acres of ponds available at its Rio Hondo, Texas
facility for research and development related to an algae-to-jetfuel project.

About PetroSun

PetroSun's operations include oil and gas exploration, development and
production and algae-to-algal oil alternative fuels production. The oil
andgas division is focused on the exploration of the Holbrook Basin of Arizona,
the San Juan Basin of New Mexico and Australian based prospects. The Company
will
continue the development of oil and gas reserves in Louisiana. The
alternative fuels division has entered the commercial stage of its
algae-to-biofuels production technology. The Company plans to establish
algae farms and algal oil extraction plants in Louisiana, Texas, Arizona, Mexico
and Central America during 2008. The algal oil product will be marketed as
feedstock to existing biodiesel refiners and planned company owned refineries.
PetroSun is headquartered in Scottsdale, Arizona with field offices in
Shreveport, Louisiana and Rio Hondo, Texas. For more information about
PetroSun visit the company's website at www.petrosuninc.com.

Except historical matter contained herein, matters discussed in this news
release are forward-looking statements and are made pursuant to the safe
harbor provision of the Private Securities Litigation Reform Act of 1995. These
forward-looking statements reflect assumptions and involve risks and
uncertainties, which may affect the Company's business and prospects and
cause actual results to differ materially from these forward-looking statements.

Contact:
Investor Relations
Osprey Partners
732-292-0982

Copyright 2008, Market Wire, All rights reserved.

-0-