SHANGHAI, Mar 9 (SMM) -  Aluminium output in Yunnan was reduced by 783,000 mt in February due to power cuts, and the time for resumption is still unknown. Under the strong pressure of supply surplus, alumina plants with high costs were unwilling to increase the production for the time being, and the ramp-up of new capacity also showed down. It is estimated that the daily output of alumina in March will remain at 210,000 mt, and the total domestic output of metallurgical-grade alumina in March (31 days) will be 6.51 million mt.