NE power statistics period:
fifteenMinutes(1): The power statistics generated every 15 minutes.
thirtyMinutes(2): The power statistics generated every 30 minutes.
oneHour(3): The power statistics generated every hour.
oneDay(4): The power statistics generated every day.
oneWeek(5): The power statistics generated every week.
oneMonth(6): The power statistics generated every month.
The defaut statistics intervalue is one hour.