Yes, electrical towers negatively impact the sale of a home.
Homes in close proximity to high tension wires will definitely sell at a lower price point than homes not near them!
The amount of depreciation depends on just how close they are. The further away, the higher the sale price and the less of an impact.
Can you see them in the backyard ? Are the towers themselves visible or just the wires?
I would say if the wires are visible , but from a few blocks away, that's not such an issue.
It's when they (the towers) are in the back yard area or in clear site from the front that has the biggest negative impact on the sale price
I have had several listings over the years that were close to the wires - they eventually sold, but it took longer days on market, and they sold at very discounted numbers.
As far as buyers, I , personally, have never had one who would accept close proximity, even if the home offered more than other similarly priced homes away from the towers.
Ask a local agent to compare and contract sale prices for homes near the wires.