SINGAPORE (Reuters) - Pakistan State Oil (PSO) has issued its quarterly tender seeking up 1.025 million tonnes of fuel oil for August to October delivery and 49,500 tonnes of jet fuel, tender documents showed on Wednesday. The company is seeking about 14 percent more fuel oil compared with its previous tender, for July-September delivery, due to stronger utility demand, traders said. The incremental demand is seasonal because its the summer over there and typically, they use more power during this period. As usual, the suppliers will be mainly FAL Oil and Bakri, a Singapore-based Asian trader said. PSO is looking for up to 11 cargoes of high-sulphur 180-centistoke (cst) fuel oil, of 65,000 tonnes each, and another three cargoes of low-sulphur fuel oil of 60,000 tonnes each for delivery into Karachi on a cost-and-freight (C&F) basis. The tender, which also seeks three jet fuel cargoes of 16,500 tonnes each, closes on July 26 and will remain valid till a day later. Earlier this month, it bought 65,000 tonnes of fuel oil from Bakri, including 25,000 tonnes of 180-cst at a premium of $17.40 a tonne to Middle East spot quotes, 30,000 tonnes of 380-cst at a premium of $23.00 and 10,000 tonnes of low-viscosity fuel oil at around $70.00, C&F. This requirement was for its bunkers market and PSO last bought 900,000 tonnes of utility fuel in its previous quarterly tender, including 780,000 tonnes of 180-cst HSFO from Bakri, Middle East trader Fal Oil and European trader Trafigura at $15.00-16.00 at tonne above Middle East spot quotes and another 120,000 tonnes of LSFO at a premium of $53.00-$55.00, C&F. PSO last sought 64,000 tonnes of jet fuel for May-July delivery from Galana Petroleum and BB Energy at premiums of $3.70-$3.90 a tonne to Middle East spot quotes.