Integrated alternative and renewable energy business Renergen’s subsidiary, Tetra4, now has a total proven methane net gas reserve of 40.76-billion cubic feet and a proven helium net gas reserve of 1.01-billion cubic feet, following an updated independent reserve review undertaken by MHA Petroleum Consultants. The updated reserves represent a 12.2% increase in methane and a 16.1% increase in helium on a proven basis relative to the independent review undertaken by MHA in March 2018.