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Principal Technology Supplies Sulfur Recovery Units For New North Dakota Refinery
Principal Technology Inc., a provider of total system solutions for natural gas, refining, chemical, process and manufacturing facilities, is supplying the small capacity sulfur recovery unit (SRU) and tail gas treating unit (TGTU) for Dakota Prairie Refining, LLC refinery in southwestern North Dakota. Designed to address the specific needs of small capacity refineries, Principal Technology’s SRUs are based on a modular platform design that reduces installation time and enables the units to meet the tight construction deadlines imposed to complete the refinery by the end of 2014.

Dakota Prairie Refinery Celebrates Start of Construction with Groundbreaking Ceremony
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).

MDU Resources Group, Inc. and Calumet Specialty Products Partners, L.P. Announce Receipt of Air Permit to Construct for Dakota P
MDU Resources Group, Inc. (NYSE: MDU) and Calumet Specialty Products Partners, L.P. (NASDAQ: CLMT) announced that the North Dakota Department of Health has issued an Air Quality Permit to Construct for Dakota Prairie Refining, a diesel refinery the two companies are developing in southwestern North Dakota.

MDU Resources Group, Inc. and Calumet Specialty Products Partners, L.P. Announce Diesel Refinery Joint Venture
MDU Resources Group, Inc. (NYSE: MDU) and Calumet Specialty Products Partners, L.P. (NASDAQ: CLMT) today announced that they have formed a joint venture to develop, build and operate a diesel refinery in southwestern North Dakota. The joint venture will be called Dakota Prairie Refining, LLC.

Calumet Specialty Products Partners, L.P. Announces Feasibility Study for Crude Oil Shipping
Calumet Specialty Products Partners, L.P. (NASDAQ: CLMT) ("Calumet") announced it will explore the feasibility of building and operating a crude oil loading dock on Lake Superior, near its Superior, WI refinery, designed to load ships with heavy Canadian and light Bakken crude oil for shipment through connecting waterways.

Calumet Specialty Products Partners, L.P. Completes Acquisition of the San Antonio, Texas Refinery Assets from NuStar Energy, L.
Calumet Specialty Products Partners, L.P. ("Calumet") (NASDAQ: CLMT) announced today that it completed the previously announced acquisition of the San Antonio, Texas refinery and associated crude oil pipeline, crude oil terminal, other operating and logistics assets and inventories (the "San Antonio Assets") of NuStar Refining, LLC and NuStar Logistics, L.P., both wholly owned subsidiaries of NuStar Energy L.P. (NYSE: NS) on January 2, 2013 for $100 million plus an amount for estimated closing date inventory, for aggregate consideration paid of approximately $115 million, subject to customary purchase price adjustments (the "NuStar Acquisition").

Calumet Specialty Products Partners, L.P. Announces Agreement to Acquire San Antonio, Texas Refinery Assets from NuStar Energy,
Calumet Specialty Products Partners, L.P. ("Calumet") (NASDAQ:CLMT) announced today that it has signed a definitive agreement to acquire the San Antonio, Texas refinery and associated crude oil pipeline, crude oil terminal, other operating and logistics assets and inventories (the "San Antonio Assets") of NuStar Refining, LLC and NuStar Logistics, L.P., both wholly owned subsidiaries of NuStar Energy L.P. (NYSE:NS), for aggregate consideration of approximately $100 million, plus an amount for closing date inventory estimated to be $15 million, subject to customary purchase price adjustments (the "NuStar Acquisition"). Closing of the transaction is expected to occur in January 2013, subject to customary closing conditions.

Calumet Specialty Products Partners, L.P. Completes Acquisition of Montana Refining Company, Inc.
Calumet Specialty Products Partners, L.P. ("Calumet") (NASDAQ: CLMT) announced today that it completed the previously announced acquisition of Montana Refining Company, Inc. ("Montana Refining") on October 1, 2012 for $120 million plus an amount for estimated closing date working capital, for aggregate consideration paid of approximately $201 million, subject to customary purchase price adjustments (the "Montana Refining Acquisition").

Calumet Specialty Products Partners, L.P. Announces Plan to Expand its Karns City, PA Specialty Products Facility
Calumet Specialty Products Partners, L.P. ("Calumet") (NASDAQ: CLMT) announced today that it plans to expand its Karns City, PA specialty products facility to include a nominal 1,000 barrels per day Gas to Liquids ("GTL") plant.

Calumet Specialty Products Partners, L.P. Announces Agreement to Acquire Montana Refining Company, Inc. from Connacher Oil and G
Calumet Specialty Products Partners, L.P. ("Calumet") (NASDAQ: CLMT) announced today that it has signed a definitive agreement to acquire Montana Refining Company, Inc. ("Montana Refining") for aggregate consideration of $120 million, plus an amount for working capital, including inventory and accounts receivable, to be determined at closing (the "Montana Refining Acquisition"). Closing of the transaction is expected to occur in the fourth quarter, subject to customary closing conditions and regulatory approval.