 DALLAS--BUSINESS WIRE--The Board of Directors of Holly Energy Partners, L.P. NYSE:HEP has declared a cash distribution of 0.35 per unit for the second quarter of 2021. The distribution will be paid on August 13, 2021 to unitholders of record on August 2, 2021. Holly Energy plans to announce results for its second quarter of 2021 on August 3, 2021 before the opening of trading on the NYSE. The Partnership has scheduled a webcast conference on August 3, 2021 at 4:00 p.m. Eastern time to disc 