Travel to Tokyo then to Kagoshima

My family and I will be visiting Japan from 3/16 to 3/26. We are flying to Tokyo then traveling by rail to Kagoshima. We will stay in Tokyo 3/24-3/26. One companion is in a wheelchair. Travel should be safe to Kagoshima - I know the railroads are open. I am worried about Tokyo to Narita - are the highways open? The train is open right? Should I cancel my trip? We are traveling with 4 children - one wheelchair.

Visiting,

I would say that travelling to or through Tokyo this week is a bad idea - especially if you are accompanying someone in a wheelchair. There is still a lot of uncertainty as to whether the planned power cuts will actually materialize, but train services in the Tokyo area have been cut back heavily since first thing this morning (Monday) to save electricity, so it could be difficult and stressful trying to travel into Tokyo from Narita Airport to catch trains onwards to Kagoshima.
It's painful to have to say this, but I would recommend that you seriously consider cancelling your trip.