On this page you will find a range of key terms explained. Please click on a letter below to be taken to a list of terms and on "show" to read the explanation.
Terms for letter 'Z'
An amendment to the terms and/or conditions (including price) of a consumer’s energy supply contract, which is provided for in the contract and is at the sole discretion of the supplier.
One kilowatt of power being used for one hour. It is the same as a 40-watt light bulb being left on for 25 hours. Also known as a ‘unit’ of energy.
The monetary amount that is chargeable in respect of each unit of gas/electricity consumed.