Dakota Prairie Refinery Celebrates Start of Construction with Groundbreaking Ceremony

  Dakota Prairie Refinery Celebrates Start of Construction with Groundbreaking

Business Wire

BISMARCK, N.D. -- March 26, 2013

Construction of the Dakota Prairie Refinery began today with a groundbreaking
ceremony held by the developers, MDU Resources Group, Inc. (NYSE: MDU) and
Calumet Specialty Products Partners, L.P. (NASDAQ: CLMT).

Construction of the diesel refinery, on a 318-acre site located west of
Dickinson in Stark County, N.D. is expected to take approximately 20 months.
The refinery will process 20,000 barrels per day of Bakken crude oil. It will
employ 400 to 500 employees during peak construction and about 100 employees
when it is operating.

North Dakota Governor Jack Dalrymple drove a bulldozer to lead the
groundbreaking ceremony. Others participating in the event included the
state’s congressional delegation, Sen. John Hoeven, Sen. Heidi Heitkamp and
Rep. Kevin Cramer, along with state, local and industry officials.

“Bringing this project from concept to construction took the effort of a great
many people,” said David L. Goodin, president and chief executive officer of
MDU Resources. “We especially appreciate the support of Governor Dalrymple,
other state officials and state agencies. Their permitting process was
rigorous, but at the same time they helped us identify and solve problems that
are involved in a complex project such as this.”

“This facility will help supply North Dakota’s growing diesel fuel market, and
will be a good contributor to the state and local economy,” said Jennifer G.
Straumins, president and chief operating officer of Calumet’s general partner.
“We look forward to working in a state where officials have demonstrated
strong support for economic development.”

The facility’s engineering and plant design are in the final stages. Westcon
has been selected as the general contractor and Ventech Engineering will be
the primary equipment and technology provider. MDU Resources’ construction
businesses, Knife River Corporation and MDU Construction Services Group, are
among potential subcontractors. Other MDU Resources’ companies involved in the
project include Fidelity Exploration and Production Company, which will supply
some of the facility’s crude oil; WBI Energy, which will supply natural gas
service to operate the facility; and Montana-Dakota Utilities, which will
supply the facility’s electricity needs.

MDU Resources Group, Inc., a member of the S&P MidCap 400 index, provides
value-added natural resource products and related services that are essential
to energy and transportation infrastructure, including regulated utilities and
pipelines, exploration and production, and construction materials and services
companies. For more information about MDU Resources, see the company's website
at www.mdu.com or contact the Investor Relations Department at

Calumet Specialty Products Partners, L.P. is a master limited partnership and
is a leading independent producer of high-quality, specialty hydrocarbon
products in North America. Calumet Specialty Products Partners, L.P. processes
crude oil and other feedstocks into customized lubricating oils, solvents and
waxes used in consumer, industrial and automotive products. Calumet also
produces fuel products including gasoline, diesel and jet fuel. Calumet
Specialty Products Partners, L.P. is based in Indianapolis, Indiana and has
eleven facilities located in northwest Louisiana, northwest Wisconsin, western
Pennsylvania, Texas and eastern Missouri.

Forward-Looking Statements

Except for the historical information contained herein, the matters discussed
in this release are forward-looking statements that involve certain risks and
uncertainties that could cause actual results to differ materially from
results anticipated in the forward-looking statements. These risks and
uncertainties include, among other things, the ability of the parties to
complete financing of the project, the ability of the parties to obtain
required regulatory permits, the cost and time to complete the project, and
the availability of crude petroleum product and markets for processed
products. These and any other statements about future expectations, beliefs,
goals, plans or prospects constitute forward-looking statements within the
meaning of the Private Securities Litigation Reform Act of 1995. Any
statements that are not statements of historical fact (including statements
containing the words “believes,” “plans,” “anticipates,” “expects,”
“estimates” and similar expressions) should also be considered to be
forward-looking statements.


MDU Resources Group
Phyllis A. Rittenbach, 701-530-1057
Director - Investor Relations
Rick Matteson, 701-530-1700
Director of Communications and Public Affairs
Tim Rasmussen, 701-530-1069
Operating Company Public Relations Manager
Calumet Specialty Products Partners
Jennifer Straumins, 317-328-5660
President and Chief Operating Officer
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