Switching energy supplier in the UK takes around 17 days and can reduce annual bills by GBP150 to GBP400 depending on current tariff, region, and consumption. According to Kaeltripton analysis using Ofgem complaint data and Citizens Advice star ratings, the gap in service quality between the top and bottom UK energy suppliers is significant and measurable.
The Kaeltripton KT Score for Energy Suppliers
Kaeltripton scores UK energy suppliers on three weighted factors:
- Ofgem complaints per 100,000 customers (45% weight)
- Citizens Advice star rating (40% weight)
- Ofgem enforcement actions (15% weight)
Current KT Scores (June 2026):
| Supplier | KT Score |
|---|---|
| Octopus Energy | 80/100 |
| E.ON Next | 70/100 |
| OVO Energy | 54/100 |
| EDF | 49/100 |
| British Gas | 38/100 |
How the Ofgem Price Cap Works
The Ofgem price cap sets the maximum rate per unit of energy a supplier can charge on a standard variable tariff. It is reviewed quarterly. The cap applies per unit (pence per kWh) and per day (standing charge) rather than to total bills, meaning high-consumption households can still face bills above the headline cap figure.
How to Switch Energy Supplier
- Get a recent bill to find current tariff, unit rate, and standing charge
- Note annual consumption in kWh (shown on bill)
- Compare using Ofgem-accredited comparison services
- Check exit fees on current tariff before switching
- New supplier handles the switch - no need to contact existing supplier
- Final bill from old supplier arrives within 6 weeks
Open Ofgem Investigations (June 2026)
Ofgem currently has open enforcement investigations into British Gas, Utilita, and OVO Energy. These are flagged in the Kaeltripton KT Score and subject to quarterly review.
Full supplier reviews, KT Score methodology, and business energy guides at kaeltripton.com/energy. Primary sources: Ofgem, Citizens Advice, Energy Ombudsman.
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