Direct debit increases are a source of frustration for many UK energy customers — particularly when they appear to outpace price cap changes or actual consumption. This guide explains how to check whether an increase is justified, how to push back if it is not, and when to escalate.
For the full context on energy price cap rates, see Energy Price Cap Guide.
Why suppliers increase direct debits
Your direct debit is set to cover your estimated annual energy costs, spread across 12 equal monthly payments. Suppliers adjust it when:
- The price cap increases — higher unit rates mean the same consumption costs more
- Estimated consumption increases — the supplier’s model predicts you will use more (often based on the time of year or recent usage pattern)
- Account is in deficit — you have previously used more than your direct debit covered, and they are collecting arrears
- End of a fixed tariff — moving from a fixed rate to the (usually higher) standard variable rate
How to calculate whether your direct debit is correct
Step 1: Find your annual consumption
Look at your last 12 months of bills or statements. Your total consumption should be shown in kWh.
Alternatively, use Ofgem’s typical household figures as a benchmark:
- Electricity: ~3,100 kWh/year (medium household)
- Gas: ~11,500 kWh/year (medium household)
Step 2: Apply the current unit rates
Use the current Ofgem price cap rates (or your fixed tariff rates):
| Calculation | Example |
|---|---|
| Annual electricity cost: | 3,100 kWh × 24.50p = £759.50 |
| Electricity standing charge: | 61p × 365 = £222.65 |
| Annual gas cost: | 11,500 kWh × 6.24p = £717.60 |
| Gas standing charge: | 31p × 365 = £113.15 |
| Total estimated annual bill: | £1,812.90 |
| Monthly direct debit: | £151.08 |
If your supplier is asking for significantly more than this — say, £200/month on this typical consumption — they are building up a credit balance on your account that should be yours.
Step 3: Check your account balance
Log into your energy account online. Check the current credit or debit balance. If you have a significant credit balance (£100+), your direct debit has been set too high.
How to challenge an unjustified increase
Step 1: Submit a meter reading
Before anything else, submit an up-to-date meter reading through your supplier’s app, website, or phone. An inflated direct debit is often caused by estimated consumption that is higher than actual — a real reading can immediately reduce the direct debit to the correct level.
Step 2: Request a direct debit review
Contact your supplier (by phone, online chat, or in writing) and request a direct debit review. Provide:
- Your actual consumption figures (from meter readings)
- Your calculation of the correct direct debit at current rates
- Your current account balance (credit or debit)
Ask them to explain the basis for the increase. If they are claiming your usage will be higher, ask what data they are basing this on.
Step 3: Request a refund of credit balance
If your account shows a significant credit balance, request a refund. Under Ofgem rules, suppliers must refund within 14 days of a valid request. Suppliers may try to retain credit to offset future usage during winter — this is partly legitimate, but credit significantly above what you will need in the next 1–2 months should be returned.
A reasonable credit buffer: 1 month’s worth of direct debit held in credit.
Step 4: Reduce your direct debit
Many supplier portals (British Gas, Octopus, E.ON) allow you to reduce your direct debit yourself via the online account, subject to a minimum amount. Use your own calculation to set a figure you believe is correct.
Step 5: Escalate
If the supplier refuses to adjust a clearly unjustified direct debit or to refund credit:
- Make a formal complaint to your supplier in writing — this starts the clock on the 8-week resolution period
- After 8 weeks (or if you receive a deadlock letter): escalate to the Energy Ombudsman at ombudsman-services.org/energy — this is free for consumers
- Report to Ofgem — particularly if the supplier appears to be systematically overcharging. Use Ofgem’s consumer complaint form at ofgem.gov.uk
The Energy Ombudsman can require suppliers to correct direct debits, issue refunds, and pay compensation (up to £10,000 in principle for financial loss).
When a large increase might be justified
Not all direct debit increases are unjustified. Check whether:
- The price cap has increased since your last review (check the Ofgem cap history table in our Energy Price Cap Guide)
- You are moving from a fixed tariff that was below the cap to the current standard variable tariff
- You have recently been undercharged (e.g. estimated bills were lower than actual, and the supplier is now catching up)
- Seasonal adjustment (energy use increases in winter — suppliers may increase before October to smooth payments)
Switching supplier
If your supplier persistently sets unjustified direct debits or refuses to cooperate, switching supplier is often the simplest solution. You can switch at any time on a standard variable tariff (no exit fee). Use a comparison site to find a better tariff and switch — the new supplier takes over the account and your current credit balance must be refunded by the old supplier within 14 days.