Electric bill tripled after installation

After Comcast equipment was installed on my duplex the electric usage tripled. Went from 1400 kilowatts per month instantly jumped to 3500 kilowatts for the first month after installation. My electricity meter is shared with the neighbor and they are furious about the increase. It's never happened before. So the bill went from $200 to $570. Did something go wrong during installation to cause this? Or is this related to the public hotspot that uses electricity if anyone uses it? I'm on a street with 1000's of college kids so could there be a lot of people whos devices are auto connecting to the public hotspot?