Teen Wolf - Season 5, Episode 15: Soundtracks

Malia coaches Kira as she tries to dim a lightbulb with her powers but only ends up blowing it up.  

After another pep talk from Malia and going through boxes of lighblubs Kira makes one last attempt to dim a lightbulb with her electrokinesis and ends up knocking out the Beacon Hills power grid. 

Malia encourages Kira to practice with her powers; Kira tries dimming a light bulb, but instead blows it up.