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I have a smart meter but have been asked to send meter readings by email
@Googie Smart meters send readings all the time, so to avoid getting a bill every day they are sent usually quarterly. If you need a bill you can send a manual reading.
@James48 You should choose halfhourly for smart meter updates. Your Dd will depend on your meter readings, if the smart meter has not started sending then send up to date meter readings. Your fixed deal to 2023 fixes the unit costs, but the more units you use, the more has to be paid.