I honestly would not recommend you live under high voltage power lines. These lines release NIR or Non ionizing Radiation. Xrays are ionizing meaning they Directly cause molecular damage.
Non ionizing supposably does not cause this Molecular damage, however, Their is this thing called "structural isomerism". N-I-R at a certain frequencies Vibrates molecules to such an extreme the molecules begin creating friction, from this extreme vibration Heat is generated (this is actually how a microwave works). BUT the theory on structural isomerism is this. The friction can cause substantial damage to the surrounding molecules, often tearing them apart or forcefully deforming them. In a sense N-I-R is capable of doing Molecular damage At the correct Frequencie.
Now all electrical devices emit this NIR, your tv, computer screen, anything that uses/emits electricity. However the amount emitted by High voltage power lines is quite large in comparison to that of your Fridge. In theory if one lived close enough and for long enough of time, it could eventually be harmful, however this is a theory.