An inkjet goes through a lot of startup and shutdown gyrations. When you have a power outage, it shuts down abnormally and restarts abnormally, When power goes off and on quickly it is severely aggravated.
If you leave your printer turned on all the time (or even not), it pays to have it plugged into a battery backup/uninterruptible power supply (UPS), Just like a computer. Then it doesn't take a beating from power flickers and longer outages. My Pixmas have been on UPSes along with my computers for years and they are better for it.
This advice, though, does not apply to laser printers. Unless you have a very high capacity UPS, a laser printer draws too much current for a UPS to handle effectively.
