Renergen Limited operates as an investment holding firm primarily focused on... Renergen Limited operates as an investment holding firm primarily focused on the alternative and renewable energy sector across South Africa and the broader sub-Saharan African region. The company's activities include the exploration, development, and sale of compressed natural gas, in addition to liquefied helium and natural gas. Established in 2014, Renergen Limited maintains its headquarters in Johannesburg, South Africa.