2015-09-11 17:23:00 +0200  Power failure.
2015-09-11 17:23:06 +0200  Running on UPS batteries.
2015-09-11 17:23:07 +0200  Mains returned. No longer on UPS batteries.
2015-09-11 17:23:07 +0200  Power is back. UPS running on mains.
2015-09-25 17:23:01 +0200  Power failure.
2015-09-25 17:23:07 +0200  Running on UPS batteries.
2015-09-25 17:23:09 +0200  Mains returned. No longer on UPS batteries.
2015-09-25 17:23:09 +0200  Power is back. UPS running on mains.
2015-10-09 17:23:14 +0200  Power failure.
2015-10-09 17:23:20 +0200  Running on UPS batteries.
2015-10-09 17:23:23 +0200  Mains returned. No longer on UPS batteries.
2015-10-09 17:23:23 +0200  Power is back. UPS running on mains.
2015-10-23 17:23:17 +0200  Power failure.
2015-10-23 17:23:23 +0200  Running on UPS batteries.
2015-10-23 17:23:25 +0200  Mains returned. No longer on UPS batteries.
2015-10-23 17:23:25 +0200  Power is back. UPS running on mains.