Not much is known about the origin of Blackout.
Major Story Arcs
Blackout was recruited into a team of "heroes" by Cyborg. This team's mission is to take down both Emperor Aquaman and Wonder Woman. Aquaman and Wonder Woman are attempting to take over the world. The war between their nations resulted in millions of human casualties. The team which Blackout was recruited to aims to end that war.
During a meeting with Batman, it revealed that another post- Flashpoint character, the Outsider, had been hunting Blackout, because he wanted to use Blackout's electric powers to light India. This hunt resulted in the loss of Blackout's girlfriend and Blackout's departure from his school. The Outsider was also recruited into Cyborg's team. Blackout voiced his reluctance working in a team with his worst enemy.
Blackout is the most powerful source of electricity on Earth.
Blackout appeared in CW's The Flash during episode 107, played by Michael Reventar.