South Africa’s supply of natural gas is set to plunge within the next three to four years and there’s a risk of a shortfall triggering the country’s next economic crisis, the head of an industry body warned. With Sasol set to curb production of the fuel from its fields in Mozambique between 2026 and 2027 as reserves dwindle and retain more output for its own operations, 300 000 to 400 000 jobs at firms that use gas for industrial purposes are endangered, said James Mackay, the chief executive officer of the Energy Council of South Africa.