Estimated Annual Consumption - your guide
What is an EAC?
EAC stands for Estimated Annual Consumption. We (and the rest of the industry) are able to use this figure to forecast the energy usage at a property over the next 12 months.
What is an EAC based on?
The EAC is calculated using the metering system’s historical consumption. Where there are regular meter readings, the EAC will be based on the previous year. EACs are re-calculated each time a reading is validated by our Data Collector.
How do we use an EAC?
- Sometimes to Calculate your Direct Debit (see ‘Usage projection’ for more info)
- Estimating readings when we have no 'actual' readings
- Estimating consumption when a meter is faulty
We don't always use EAC to predict a member's usage - as stated below, EAC is only used for supplies where you don’t have a smart meter and there's no actual readings in the past 12 months.
What is Usage projection?
Usage projection is a figure produced by our billing system, that uses smart meter readings (if available) to project the usage for you over the next year. If you don't have a smart meter, it uses any actual meter readings obtained over the past 12 months.
If we don't have any actual meter readings within the last 12 months, we'll use your EAC and AQ (the gas equivalent of EAC) to calculate your usage projection.
Usage projections will be displayed on monthly bills and will also be used for Direct Debit check in’s and renewal quotes.
How do we update an EAC?
Whenever a new reading is submitted to industry, a new EAC is calculated and sent to us to use.
If your EAC is incorrect, you should keep sending us regular readings. As the EAC is calculated based on the entire reading history of an electricity supply (MPAN), submitting regular readings over a period of time will gradually change the EAC until it matches the member's usage. The better alternative is to get a smart meter!
There are some exceptions where we may amend the EAC in other ways (e.g. when there has been a sudden and large increase/decrease in the EAC that doesn't match the most recent readings) but these wouldn't be applied without supporting readings.
We can't contact the industry to say we want the EAC amended, so all we can do is ensure the readings are correct on an account. If you’re not sure about your latest DD check in, the best thing to do is ensure we have accurate meter readings, and book a smart meter exchange.
What is the average EAC?
The current average EAC / AQ, as specified by Ofgem, is as follows:
- Electricity (P1): 3,100 kWh
- Electricity (P2): 4,200 kWh
- Gas: 12,000 kWh
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