Helion is using pulse fusion with deuterium (D2O) and helium-3 (3He) as fuel. The company has developed the Trenta Magneto-Inertial system to generate a fusion reaction and excess energy. Pulsed, non-ignition magneto-inertial fusion doesn’t require big structures and big budgets to build a reactor. With Microsoft as its first signed customer, the plan is to have a 50-megawatt reactor in operation by 2028 in Washington State.