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Estimated Readings

Estimated Readings


When you’re billed by your business energy supplier, unless you regularly provide them with your meter readings, then chances are your bill will be calculated using estimated meter readings.

These estimated readings are based off average usage figures, as well as your own past meter readings. So, if you haven’t provided your supplier with an accurate reading in a while, then your bill will likely not be representative of the energy that you’re actually using.

If you have been billed using estimated meter readings for a sustained length of time, when you finally provide an accurate reading of your meter, you can expect to find that your account is in credit – which means that your supplier has been over-estimating your energy usage. However, if your supplier has under-estimated your energy consumption, then you can expect a high bill to compensate for the energy that you’ve been using, and not charged for.

Under-estimating on energy consumption can be particularly problematic for new, or small, businesses where an unexpected spike in costs can seriously unbalance cash flow. This is why it’s important for business owners in particular to regularly provide suppliers with meter readings.

If you have received a high bill after giving your supplier an actual meter reading, you have a legal obligation to pay the bill, unless your supplier has not made an effort to read your meter for over two years. However, if you feel there is a genuine error with the billing amount, you should write to your supplier to raise the issue.

Supplier Contact number Email Address
British gas business 0800 107 3457

British Gas PO Box 227 ROTHERHAM S98 1PD

EDF 0800 096 2255

EDF Energy Osprey House Osprey Road EXETER EX2 7WN

E.ON 0333 202 4586

Customer Service Centre, E.ON, PO Box 7750, Nottingham NG1 6WR

npower for business

Electricity: 0845 166 3360

Gas: 0845 166 3320

npower Group Ltd PO Box 177 Houghton le Spring DH4 9AQ

Scottish Power Business 0800 040 7002

ScottishPower Customer Services, Cathcart Business Park, Spean Street, Glasgow, G44 4BE

SSE 0345 725 2526

ScottishPower Customer Services, Cathcart Business Park, Spean Street, Glasgow, G44 4BE

Opus Energy 0843 227 2377

Royal Pavilion, 2 Summerhouse Road, NN3 6BJ

DONG Energy 0800 0568 101

DONG Energy 5 Howick Place London SW1P 1WG

CNG 01423 502 554

CNG Ltd, 2 Victoria Avenue, Harrogate, North Yorkshire, HG1 1EL

Corona Energy 0800 804 8589

Edward Hyde Building 38 Clarendon Road Watford, WD17 1JW

Haven Power 01473 725 943

32 The Havens, Ransomes Europark, Ipswich, Suffolk IP3 9SJ

Dual Energy 01903 703 400

Dual Energy, Premium House, The Esplanade, Worthing BN11 2BJ

Gazprom 0845 230 0011

Gazprom Energy, 27 Quay Street, Manchester, M3 3GY

Extra Energy 08451 400 251

54 Hagley Road, Edgbaston, Birmingham, B16 8PE

Crown Gas & Power 0161 762 7744

Crown Gas & Power Bury New Road, Heap Bridge, Bury BL9 7HY, UK

If your supplier don’t respond within 14-days, you should escalate the situation to the Energy Ombudsman, who will investigate the situation independently.


Phone: 0330 440 1624



Post: PO Box 966, Warrington, WA4 9DF

To ensure that you don’t get caught out by estimated bills in the future, here are some tips:

  • Give regular meter readings to your supplier. We recommend once every six months as a minimum to account for seasonal changes to your consumption habits.
  • Install a smart meter (where available). A smart meter automates the process of providing consumption data to your supplier which means that it can save you time and your bills will be much more accurate
  • Compare your bills. When you receive a new bill, you should compare it to your previous bills, particularly your last bill after providing a meter reading. This will help your determine if your supplier is under, or over, estimating your bill.

Remember, if you are not satisfied with the service your supplier is offering, you can switch, and you could be surprised by how much you could be saving.