The song was written by David Schmitt, Kyle Even, Eric Armenta, Joshua Aragon, Luis Bonet, and Simon Wilcox while production was handled by Ian Kirkpatrick, and was the first song written for the album [REF].
Musically, "Blackout" is a synthpop[REF] and dance-pop song that also blends house, Italo disco and electro genres[REF] and features a "chugging bassline" and "punchy beats", while Schmitt's vocals have been described as "nasal" [REF].