I dug up more info:
Sender: spindump
Saved diag report for powerstats version com.apple.SystemStats.Daily to /Library/Logs/DiagnosticReports/powerstats_2013-11-16-075320_ProBook.diag
Saved diag report for powerstats version com.apple.SystemStats.TopPowerEvent to /Library/Logs/DiagnosticReports/powerstats_2013-11-16-075321_ProBook.diag
Apple Forum Quote:
zThe powerstats-entry is no error-report. Its only a daily system-diagnostic-report and triggered by a LaunchDaemon called `com.apple.SystemStats.Daily`. You can find this daemon in your System/Library/LaunchDaemons - Folder.
You can edit this file with a plist-editor (like PlistEdit Pro) and delete the CalendarInterval-entry. Than save back (you need your admin-password), restart and you are good to go. No more reports and no side effects.
Before editing be sure, to backup the original daemon file.
This trigger seems to be a leftover from development and should be removed by Apple in one of the next updates.