INGASCO main production plant site is located at Banay-banay II, San Jose, Batangas City with a total lot area of 3.57 hectares. As the biggest liquid cryogenic plant site in the Philippines, this plant can produce 51,360 m3 of gas per day with a maximum of 48,000 m3 on oxygen while 179,760 m3 of nitrogen gas per day with a maximum of 168,000 m3 and on liquid argon, the plant is capable in producing 2,568 m3 with a maximum of 2,400 m3.

The additional plant site is located at San Simon, Pampanga with a total lot area of 1.728 hectares. This gas production facility can produce 1,644 m3 per day of gases with a maximum of 1,536 m3 on hydrogen.

New Air Separation Plant is presently installed at Philtown Philippine Townships in Tanauan, Batangas with a total lot area of 3.50 hectares. The commercial operation is scheduled on October 2007.