If she is doing this, she will need to disconnect the wall outlets from the phone company's line.

You have to pay a plumber to disconnect water and sewer service, then pay to upgrade the service when you reconnect. 

It is disconnected from the South Florida labor market and I find there is a different dynamic here.

I haven't had a lack of interest or showings, its the complete disconnect of at the showing them saying, "I love this place, I want to apply" and then they never apply...I send a follow up message saying thank you and send them the link to my application on my website, but then nothing happens.

The electrician suggests upgrading to a 200 electrical service entry with through the roof mast and relocate existing circuits into a single EXTERIOR 40-space 200-amp panel box with a main disconnect.

Serve reminder letters on business letterhead that if their service is disconnected, they will receive a notice to quit.

Tenant agrees to take due precaution against freezing water or waste pipes and stoppage of same in and about said premises.This includes, but is not limited to disconnecting all garden hoses from outdoor faucets prior to freezing weather and opening cabinets under fixtures that are adjacent to outside walls to allow warm air circulation near water and waste pipes.If water or waste pipes are frozen Tenant will notify Landlord immediately and in writing.If Tenant did not take due precaution to prevent the freezing and/or fails to notify Landlord of a problem in a timely manner, Tenant will be held liable for all damage caused thereby.

Even when the tank has been disconnected, the line into the house might remain especially when it goes through a foundation wall. 

A real vacation where you really want to (or by virtue of location, need to) disconnect?

in our area they don't disconnect anything for a few months so there is no charge if there is a lag.