The Japan High School Baseball Federation (JHBF) held a steering committee meeting today in Osaka and confirmed that they will make adjustments to the tournament schedule the day before any announced blackouts.
The Kansai Electric Power Company might announce blackouts during the tournament. If they do, the JHBF will make changes to the schedule, as needed, on the day before the planned blackout. While there is a chance blackouts can be canceled the day of, the JHBF wants to make decisions ahead of time in order to keep the fans properly notified.
Source: Sponichi 7/25/2012