HollyFrontier Corporation Provides Update on Fourth Quarter Refinery Maintenance

HollyFrontier Corp., January 3, 2017

HollyFrontier Corporation recently announced that unplanned fourth quarter maintenance on its Navajo refinery Catalytic Reforming Unit (CRU) has been completed. Additionally, cold weather in December at Navajo resulted in boiler outages which affected refinery run rates. The Tulsa refinery also experienced rate reduction in December due to unplanned CRU issues. During the downtime, the Tulsa refinery expects to accelerate maintenance for the East Crude Unit and other units originally planned for later in 2017 and take the opportunity to upgrade catalyst in the CRU with the latest technology. As a result of the planned and unplanned maintenance, HollyFrontier expects crude oil throughput for the fourth quarter 2016 to average between 425,000 and 435,000 barrels per day.

About HollyFrontier Corporation

HollyFrontier Corporation, headquartered in Dallas, Texas, is an independent petroleum refiner and marketer that produces high value light products such as gasoline, diesel fuel, jet fuel and other specialty products. HollyFrontier operates through its subsidiaries a 135,000 barrels per stream day ("bpsd") refinery located in El Dorado, Kansas, a 125,000 bpsd refinery in Tulsa, Oklahoma, a 100,000 bpsd refinery located in Artesia, New Mexico, a 52,000 bpsd refinery located in Cheyenne, Wyoming and a 45,000 bpsd refinery in Woods Cross, Utah. HollyFrontier markets its refined products principally in the Southwest U.S., the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states. HollyFrontier and certain of its subsidiaries also currently own a 37% interest (including a 2% general partner interest) in Holly Energy Partners, L.P.

Information about the Company may be found on its website at

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