Pub.1 2019-2020 Issue 3

Member Update: HollyFrontier Corporation Investing to Produce Tier 3 Fuels at its Woods Cross Refinery HollyFrontier Woods Cross Refinery Selects Tier 3 Fuels Project WEST BOUNTIFUL, Utah, March 30, 2020 H ollyFrontier Corporation (NYSE: HFC) is excited to announce today that we will be producing Tier 3 fuels for use along the Wasatch Front and have selected a project at the HollyFrontier Woods Cross refinery to achieve that goal. While HollyFrontier’s fleet of refineries are compliant with the federal, nationwide Tier 3 standards, this development will allow the gasoline produced at our Woods Cross refinery for use in Utah along the Wasatch Front to meet the low-sulfur Tier 3 standard. “HollyFrontier Woods Cross cares about the environment and the air quality in the community, which is also home to many of our employees and their families,” said Scott White, Vice President and Refinery Manager, HollyFron- tier Woods Cross Refinery. “By moving to Tier 3 fuels, we are advancing our commitment to deliver high-quality fuel products in an environmentally responsible way. We support Governor Gary R. Herbert, Utah Senate President Stuart Adams, and Utah Speaker of the House Brad Wilson for their diligent efforts and accomplishments to improve air quality in Utah and along the Wasatch Front, in particular.” By producing cleaner, lower emitting fuel, this effort will support Utah’s overall efforts to improve the state’s air quality and reduce emissions. “The largest contributor to our air quality problem is mobile sources - vehicles,” Governor Gary R. Herbert said. “When coupled with a Tier 3 car, the fuels that will be produced at HollyFrontier’s Woods Cross refinery will reduce these mobile emissions by up to 80%; that’s like taking four out of five cars off the road. We’re grateful to HollyFrontier for investing in Utah’s air quality.” “In our efforts to clear the air, there are no perfect answers, but there are practical solutions,” Thom Carter, Executive Director of the Utah Clean Air Part- nership (UCAIR), said. “HollyFrontier’s move to produce Tier 3 fuel here in Utah will mean a significant reduction of emissions in our airshed. We are grateful for their ongoing commitment to our community.” HollyFrontier understands it is a privilege to conduct business in Utah and is proud the Woods Cross refinery has been part of the West Bountiful and Davis County communities for more than 80 years. 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 owns and operates refineries located in Kansas, Oklahoma, New Mexico, Wyoming and Utah and markets its refined products principally in the South- west U.S., the Rocky Mountains extending into the Pacific Northwest and in other neighboring Plains states. In addition, HollyFrontier produces base oils and other specialized lubricants in the U.S., Canada and the Netherlands, and exports products to more than 80 countries. HollyFrontier also owns a 57% limited partner interest and a non-economic general partner interest in Holly Energy Partners, L.P., a master limited partnership that provides petroleum product and crude oil transportation, terminalling, storage and throughput services to the petroleum industry, including HollyFrontier. 27 UP DATE