Kagara operated successfully for more than a decade but in more recent times has suffered a sharp fall in investor support after being hit by weak base metals prices, high debt and operational issues.
He is also a director of Carbon Energy and chairman of struggling gold miner Apex Minerals, but plans to step down from those roles.
Prior to found Kagara, he had been executive chairman of Forrestania Gold for 10 years.
Energia chairman Tony Iannello said the board was extremely pleased to secure the services of someone of Mr Robinson's calibre.
Energia's main focus is the Carley Bore uranium deposit, near Onslow.