Electricity Horror Movies
The Pulse, Shocker, Ghost in the Machine, The Darkest Hour
The Pulse (1988)
An intelligent pulse of electricity moves from house to house. It's really a smart grid.
It terrorizes households by taking control of their appliances. The Internet of things run amok. The pulse kills some people but others wreck their house fighting it. Then the pulse travels along the power lines to the next house, and the horror repeats itself.