Domestic alumina production totaled 352,255 tonnes in Q3 2025, down 3.2% from Q2 but 2.0% higher YoY, as the industry’s two active refineries operated at an average rate of 37.8% capacity.

The decline was led by the Jamalco refinery (operating at 77% capacity), which recorded a quarterly decrease of 3.2% to 270,269 tonnes, though output remained 8.1% above Q3 2024. Windalco’s production (52.8% of capacity) fell 3.3% to 81,986 tonnes, marking an even sharper 14.1% YoY decrease as the plant experienced some mechanical and logistical setbacks during the review period.

YTD alumina output aggregated to ~1.10 million tonnes, down 2.1% compared to the corresponding period in 2024, as operational challenges and capacity constraints offset early gains.

Alumina Production (mt)