ITER will be the 'game-changing' experiment because it is built large enough to release fusion power at the scale of a power plant — and be the first experiment to release more fusion power than injected." How ITER will workThe process to generate fusion energy is both enormously sophisticated and elegantly simple. For instance, a 2,000 megawatt fusion power plant would supply electricity for 2 million homes. Even if all goes well with the ITER experiment, it would likely take decades before fusion power is widespread. "Even with strong international support from private industries, the race to commercial fusion energy is a marathon, not a sprint," Mauel said.