This is a Jacob’s Ladder, twisted into a double Helix.
To make a Jacob’s Ladder you put two upward pointy bits of metal together and put a high voltage between them. High enough and the electricity can arc through the air by ionising the air Pikachu style.
This ionised air is hot, and it rises, pulling the arc up with it.
Just remember, unless you’re trained, don’t fuck around with electricity. Just don’t.