Supplier Monitor
Live performance, complaints and trust scores for UK suppliers.
Supplier Comparison
Compare energy suppliers side by side on price and service.
Switching Guide
Step-by-step help to switch energy supplier the smart way.
Should I Switch Supplier?
Check whether switching is worth it for your situation.
Best Energy Suppliers
The best-value and best-rated UK energy suppliers.
Fixed Tariff Report
Download our latest UK fixed tariff market report.
Supplier scores shown across the site come from one canonical supplier intelligence record, so the same figure appears on every page. See the methodology behind these figures.
What do you need help with?
- Compare supplier performanceIndependent scores across six dimensions
- Decide whether to switchWhat switching can and cannot achieve
- Understand fixed vs variableWhich structure suits your situation
- See how we score suppliersWeightings, sources and corrections
- Walk through a switchEach step and what can go wrong
Switching and supplier performance: the essentials
PowerGuardian is not a switching service
We do not run a white-label comparison journey and we do not rank suppliers by what they pay us. PowerGuardian publishes independent supplier intelligence so you can judge a supplier on complaints, service, tariff competitiveness, billing behaviour, transparency and stability before you commit. Where a page contains an affiliate link, that is disclosed on the page itself.
Price is only one dimension
The cheapest headline tariff is not automatically the right choice. Exit fees, billing accuracy, how quickly a supplier answers the phone and how it handles a disputed bill all matter once something goes wrong. Our supplier scores keep those dimensions separate rather than collapsing them into a single star rating.
Switching is not always the answer
For some households the better move is a payment-method change, a direct debit review or a tariff change with the current supplier. We say so on the relevant pages rather than presenting switching as universally beneficial.
Scores are editorial, dated and challengeable
Every supplier score carries the date of the data behind it and a link to the scoring methodology. Suppliers and readers can challenge a score; corrections are recorded publicly rather than applied silently.
Guides in this topic
- How to switch energy supplier — The switching process step by step.
- Should I switch energy supplier? — When switching helps and when it does not.
- Should I fix my tariff now? — Fixing against the current outlook.
- Fixed vs variable tariffs — How the two tariff structures differ.
- Dual fuel vs separate suppliers — Whether combining fuels is worthwhile.
- Cheapest energy supplier — What 'cheapest' means once the category is defined.
- Cheap gas and electricity — Where lower-cost deals currently sit.
- Octopus tariffs compared — Agile, Go, Cosy and Tracker side by side.
- Green energy suppliers — Renewable tariffs, REGOs and greenwashing checks.
- Energy tariff glossary — Plain-English definitions of tariff terminology.
PowerGuardian research and data
- UK Supplier Performance Report 2026 — Full scoring table and data period.
- Best Value Suppliers Report 2026 — Value analysis with the measured category stated.
- Fixed Tariff Report 2026 — Fixed deal availability and pricing.
- Supplier Monitor — Independent performance scores for the suppliers we track.
- Supplier Trust Index — The published index behind supplier trust scoring.
Official sources
- Ofgem — switching energy supplier — The regulator's guidance on the switching process.
- Energy Ombudsman — Free escalation route once a supplier complaint is deadlocked or eight weeks old.
Your next step
See current independent scores, the date behind them and the evidence for each supplier.
Open the Supplier MonitorCommon questions on this topic
Last reviewed 13 August 2026
Written and maintained by the PowerGuardian Consumer Desk. The consumer desk turns market data into practical decisions for UK bill payers — when to fix, when to switch, and how to spot tariffs that look cheap but aren't. Guidance is independent: we take no commission from energy suppliers for it.
PowerGuardian publishes independent guidance for UK households. We do not provide regulated legal or financial advice. Read our editorial policy.
Related Calculators
Related PowerGuardian Guides
Supplier Tools
Explore the Knowledge Centre
Energy Bills Hub
Everything you need to understand, estimate and reduce your UK energy bills — from calculators to the price cap and why costs change.
Energy Saving Hub
Practical ways to use less energy and spend less — from appliance running costs to efficiency scoring and smart saving devices.
Smart Meters Hub
Everything about UK smart meters — how they work, common problems, generations explained and tools to track your usage.