Why do some countries have visible electricity cables above ground whereas other countries have the cables underground?

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Why do some countries have visible electricity cables above ground whereas other countries have the cables underground?

In: Engineering

It’s way more expensive to dig tunnels for electricity cables. Many electricity grids can also be too complicated to move underground.

Putting in poles is cheaper, but unaesthetic. Some communities are willing to pay for the aesthetics, and some are not. This is a neighborhood by neighborhood thing, not country by country, at least where I live. The wealthier an area and more densely populated, the more likely they are to be underground.