State-run oil company YPF launched its second fuel oil tender in April, this time to buy two 50,000 metric ton cargoes (some 375,000 barrels each) to be received in June and supplied to domestic thermoelectrical companies, according to a document seen by Reuters on Thursday. The fuel will be delivered to Cammesa, Argentina's electricity market administrator, while the 90,000 barrel per day (bpd) Campana refinery undergoes a maintenance to its key operational plants, including crude distillation units, a delayed coker, a catalytic cracker and a reformer. YPF bought a previous fuel oil cargo earlier this month that will be received from May 26 to June 1.