1.3 is a great price.
The substation is near Colorado so it’s some distance away. Living under high-voltage power lines does carry some discount but it’s not this much. The new homes across the creek from this house are just slightly farther away from the power line and I doubt those houses are as heavily discounted. The main discount in the 1.3 price is from having the tower right in the backyard, so effectively you are buying a smaller lot than stated on paper, but 1.3 is still a great price for the smaller lot.
Maybe buyer can replace the roof with a thick layer of lead to reduce the magnetic field from the power lines?