Last updated: 1 May 2026
Energy Bill Refund Calculator
Energy suppliers hold around £3 billion in customer credit balances — and you can ask for any excess back at any time under Ofgem rules. Use this to estimate what you might reclaim.
The amount your supplier currently owes you. Check your latest bill or app.
Suppliers can keep a reasonable winter buffer. Mid-summer, the buffer should be small.
Under Ofgem rules, suppliers must refund excess credit promptly when requested, unless they have reasonable grounds not to (e.g. winter is coming, you owe a final bill). For closed accounts they must refund within 10 working days of the final bill. Source: Ofgem — Are you owed money on your energy bill?
✓ Free to use · ✓ No sign-up · ✓ No personal data stored · ✓ Updated for 2026/27 tax year
Ready to claim?
Apply directly to the official UK government source — no fees, no middlemen.
Apply on GOV.UK →