Questar Fueling to Build CNG-Fueling Facilities for Swift Transportation and Central Freight Lines

Questar Fueling has signed an agreement to build, own and operate a
compressed natural gas (CNG) fueling facility in Houston, Texas, that
will serve up to 200 natural gas-powered trucks operated by Swift
Transportation and Central Freight Lines. These trucks are projected to
use about 5 million gallons of natural gas per year. The majority of the
trucks will use a private time-fill facility in which the trucks fill
overnight. The remainder will use a five-lane, high-speed-fueling
facility that will also be open to the public.

'Questar Corporation is excited to announce a partnership between these
"best-in-class′ carriers and our fueling company ? Questar Fueling,?
said Ron Jibson, president, CEO and chairman of Questar Corporation.
'Swift Transportation and Central Freight Lines are industry leaders in
the adoption of CNG as a transportation fuel for the heavy-duty market.
I commend them for their foresight in recognizing natural gas as a fuel
that could transform the industry. With such abundant supplies of
natural gas in America, it′s only a matter of time before we see more
trucking companies switching fuels to cut costs, increase efficiencies
and improve the air we breathe.?

'Our vendors expect us to consistently find ways to improve our
transportation efficiencies,? said Jerry Moyes, chairman, founder and
CEO of Swift Transportation. 'CNG helps us meet that objective, and our
partnership with Questar Fueling will help facilitate our transition to
CNG.?

About Questar:

Questar (NYSE: STR) is a Rockies-based integrated natural gas company
with an enterprise value of about $5 billion and four complementary
lines of business: retail distribution, interstate transportation,
development and production, and CNG for motor vehicles. www.Questar.com

About Swift:

Swift Transportation (NYSE: SWFT) is a Phoenix-based company that
operates transportation and truckload carrier services in North America.
It operates a tractor fleet of nearly 16,000 units comprised of more
than 11,500 tractors driven by company drivers and 4,000 owner-operator
tractors. It also includes a fleet of 51,000 trailers and 6,400
intermodal containers from 34 major terminals positioned near major
freight centers and traffic lanes in the United States and Mexico. www.swifttrans.com

Questar Corporation

Media: Darren Shepherd, 801-324-5167

Investors:
Tony Ivins, 801-324-5218