On our electricity bill there is a billing section for 'Shoulder', I.e. The power that we consume during the 'shoulder' period is less expensive than that which we consume during the 'Peak' period. There is no read-out on the LCD panel of the smart meter that equates to 'shoulder'. How does the meter know the difference between what We use in 'peak' and in 'shoulder' times, and where/how is it recorded, please?