Here an electric charge sets up a ball of diluted steam plasma, from moist air. The ball skits around, using out nuclear radiation, heat and light itself sustains. After a period of the plasma pressure drops and a lightning effect ceases.
My ideas are to use an electric field to strike up a steam plasma in the two. It will be a pure steam plasma, so we get off more heat and low power radiation well be maintain the steam pressure. The plasma will be contained by the glass tube.
So nature does molecular nuclear fusion from a steam plasma, and lightening years as how. We liberate no carbon dioxide and make no toxic radioactive waste. We kill nobody. Safe, clean, free and the natural power!