This is a re-post of what my host sent me.
Summary: Nothing to fear. But, something may happen.
This is to inform you of an upcoming maintenance period that will affect the power of the entire building in our Kansas City, MO location. On Saturday, February 25th from 6:00 AM to 6:00 PM Central Time, power to the Oak Tower building will be cut for matinenace[sic] dealing with power switching gear at the building. Main gear will also be load tested and cleaned.
Just as a reminder, the data center is equipped with both UPS and generator appliances, as such, we do not anticipate having any downtime via network nor power. The data center plans to have the generator running at 5:30 AM until 6:30 PM Central Time or as needed. In preparation of the outage, the generator has already been tested, and fueled to supply power for up to 24 hours.