Looks like cable company work to me.
Most utility poles are shared jointly by multiple users. The poles are divided up into vertical zones based on their height above ground. The top zone on the power is used for high-voltage transmission lines, the next section for transformers and medium-voltage distribution lines, the next lower section is for telephone, the next for cable TV and broadband, etc. There is usually a gap between the power lines and the communications cables for safety reasons.
In my part of the world, cable companies have the right to directly tie into the power lines in order to power their distribution amplifiers and other equipment. I believe that they register each connection and pay a flat-rate monthly fee for the power.
Many of the state licensing laws that apply to electrical contractors and security/surveillance integrators provide a specific exemption for telephone and cable companies. This sometimes allows them to get away with some pretty shoddy workmanship.