Most utility easements are a matter of public record, or can be determined by inspection of the property. Some are created by statute. The full text of all easements of record is typically disclosed in a title report provided in the due diligence period when real property is under contract but has not yet closed, and an seriously problematic easement could be an out from an otherwise binding real estate contract.
You might also want to confer with your architect as the existence of easements could impact the kind of floor plan that is possible on a site and where the footprint of a building or fence could be located.
It would be rare for the existence of a utility easement to impair the marketability or value of real property. Almost all urban and suburban real estate, and lots of rural real estate has utility easements and even if there isn't one when you buy the land, a utility normally has the right to obtain one using powers of eminent domain.
There are rare exceptions when it would be material in odd factual situations, but it wouldn't be a common issue to worry much about.