The high voltage power lines probably will detract some buyers but so will other features. Others won't care. That's what I found on a listing I had in Folsom and it was only .20 acres.
Jim had the best response on this.
My opinion: It is a big drag on resale, the esthetics are unpleasing to most, and even without evidence of health effects, people are afraid anyway. On the other hand, if the price is dramatically lower than the same place would be otherwise.. AND you love the house, AND you love the rest of the acreage.
Hey It IS FIVE acres. ... It is not like the lines cross directly over the house. Back pasture? Imagine what you would pay for the house if it were on only 3 acres. If it is a good deal with half the acreage, and you realize you will have to pass your savings on to any potential buyer when you eventually resell, then consider it.