Nuclear power is heating up again, and these three U.S. companies could be on the cusp of a 2026 breakout.Nuclear energy is back.After decades of stagnation, nuclear power has emerged as a viable clean energy source. It was the world's second-largest low carbon source of electricity in 2024, and its generation capacity is expected to quadruple in the U.S. by 2050. Given the immense potential for nuclear energy, several companies have been making moves lately to build out their technology and arsenals. But i ...