Australian cleantech startup RayGen has raised AU$127 million (US$79.8 million) in a Series D funding round, marking one of the largest clean energy tech investments in the country. The funding will enhance the company's solar energy and long-duration storage solutions, with backing from notable investors like SLB, ARENA, and Equinor Ventures.This investment highlights the growing importance of specialized energy storage technologies amid challenges in the clean energy sector. RayGen's innovative "thermal hydro" technology, with a 70% round-trip efficiency, positions Australia as a key player in the global clean energy market, moving beyond its traditional role as a resource supplier.