If an Electric-type move is used by a Pokémon with this Ability, its Attack or Special Attack stat is multiplied by 1.5 during damage calculation, effectively increasing damage dealt by 50%.
Generation IX
The attacking stat multiplier has now been reduced to ~1.3 (5325/4096).
Please note that Abilities marked with a superscript are only available in the stated generation or later.
For Generation III and IV games, ignore Hidden Abilities.
Trivia
Transistor is the only variation of Steelworker that does not increase the attacking stats by a multiplier of 1.5 (though it used to, in Generation VIII).