Project Arcturus Il
This as a Republic follow up to the partial failure of the Arcturus Project, which draws power from an alternate realities space, rather than our own. By doing this, there is no need to contain the power as it can be drawn from at will form the alternate reality. It was a huge success, and the scientist responsible for the project was given the Obroa Prize.
It is the most powerful source of energy to date, and although the Republic has refused to speculate, it is highly likely they have incorporated this technology in some manner for the military.