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What does controlled vs uncontrolled metering mean?

If you have controlled/uncontrolled metering the power your network company is able to ‘control’ is measured separately to the power that they can’t. Most networks will give you a discounted rate on the power they can control – which is usually the supply to your hot water cylinder. This is because they are able to switch off the ‘controlled’ portion of your supply for short periods, for example when the demand on their network is high or there are faults or emergencies on their lines.