Petratherm Ltd is an Australian geothermal energy company that specializes in the exploration, development, and commercialization of geothermal resources. The company was founded in 2000 and is headquartered in Adelaide, South Australia.

Petratherm's primary focus is on developing geothermal projects in Australia, with a particular emphasis on the Cooper Basin in South Australia. The company has also explored geothermal opportunities in other parts of the world, including Indonesia and Chile.

Petratherm's flagship project is the Paralana Geothermal Energy Project, which is located in the northern Flinders Ranges in South Australia. The project involves drilling deep into the earth's crust to access hot rocks and using the heat to generate electricity. The Paralana project has the potential to generate up to 30 megawatts of electricity, which could power around 20,000 homes.

In addition to its geothermal projects, Petratherm also has a research and development division that focuses on developing new technologies and techniques for geothermal exploration and development. The company is committed to sustainable and environmentally responsible practices in all of its operations.