In 2008, San Marcos School District changed the school boundaries to relieve overcrowding in several schools including San Elijo Elementary. 200 children who lived in Old Creek Ranch and Mahogany that used to attend San Elijo Elementary had to be transferred to Carrillo Elementary which is farther away. There were blogs where OCR residents were very upset because they were still paying the same mello-roos and generally felt like the black sheep of San Elijo HIlls (even though they were never really officially part of SEH, just like Venzano). I could see how in a time of desperation from more overcrowding, Venzano would be the next to change to a different school, but I would think that in order to do so they would have to change the school boundaries again and that seems like it would be difficult due to Venzano’s location. I suppose you could call the school district to enquire about the “what if” scenarios.
Regarding large power lines, I used to want to avoid living close to them, but after more research I felt better about it. My husband who never believed that they would pose a health risk does believe that home prices should still be affected negatively due to the eyesore factor. Of course, it all depends on the buyer and if they care or not, but my husband and I would think that a 5% reduction on the house price would not be out of line if they were in your back yard, but less if 1500ft away.
I would highly recommend calling SDGE. They will come to the property and do a free EMF testing and they will give you a full report on all the different areas of the home inside and out. I was worried about high EMFs in a previous rental of mine and it came back fine. This could put yourself and/or your future buyers at ease.