re: Has anybody ever sold easement rights to a power/utility company?

Ask him approx how many sq ft of your one acre, 43560 sq ft parcel he intends to use for power lines/easement. Then tell him many renters fear cancer from voltage, and that type of stigmatization may cost you $. Then show him your property records to see how much your assessed value currently is. Whatever that number is, I'd start at 25% that value plus one year minimum rent due to concessions you'll have to make to current or future renters for inconvenience. Should project run over a year, you'll prorate it accordingly.

He won't pull out a check, but he'll know you are serious