any electric utility guys?

[rick-l]

What are these coils on the wires? This is from (what I suspect is a very high voltage) transmission line across the St Laurence seaway.

[red-beard]

They are springs. The longer the wires, the more tension you need on the cables to prevent sag. Especially as temperature changes.

[Grog]

Hot day, high current load, wires get hot and droop. Since that looks like a long run over a river= less support, need for coils to take up slack & keep the wires above the ships.

[Arizona_928]

Next time you go by them, walk under them. The buzzing is very unheimlich..

[rick-l]

My first though was springs also but then thought those wires must weigh tons.

[Rapewta]

They do look like "power-line-carrier" wave traps.
Basically, a device that can be tuned to let a specific frequency travel down the
transmission line and go into a device in the control room that determines where a
electrical fault happened and prevents the opening of circuits that see the fault but don't need
to de-energize.
I am sure they are just springs but wave traps come in many different shapes and sizes.