The Kalos Power Plant appeared in The Future Is Now, Thanks to Determination!. While traveling through Lumiose Badlands, Ash and his friends passed by the Power Plant, when suddenly Pikachu, Dedenne, and Luxio started acting strangely and left their Trainers. It turned out that many other Electric Pokémon were being attracted to the Power Plant, so Ash and company decided to sneak in through an air vent to investigate. They found a group of imprisoned workers called Jolt, Jules, and A.C., who told them how Team Rocket had taken over the Power Plant and started using its parabolic antenna to lure in multiple Electric Pokémon for them to catch. By doing so, they had also caused a blackout in Lumiose City.
Ash and his friends rushed to confront Team Rocket, who sent Pikachu and Luxio to attack Ash and Clemont. Using his Aipom Arm, Clemont was able to conduct Luxio's electricity to the Power Plant systems and overload it, causing it to shut down and free all the controlled Pokémon. Before Team Rocket was able to reactivate the system, Luxio suddenly evolved into Luxray and used its newly learned Electric Terrain to destroy the antenna Team Rocket had used to control the Electric Pokémon inside the Plant. Thanks to the power boost from Electric Terrain, all of the Electric Pokémon then proceeded to use their attacks to send Team Rocket blasting off once again.
Once everything had been fixed, Clemont surprised the rest of the group by telling them that he wanted to go to Lumiose City in advance and prepare for his upcoming Gym battle with Ash. The group accepted his decision, promising to meet him again at the Lumiose Gym.