UK homeowners should compare energy suppliers at least once every 12 months or whenever their fixed tariff is due to end. Energy prices, tariffs and supplier offers change regularly, so reviewing your options each year can help ensure you’re not paying more than necessary.
Many homeowners stay with the same energy supplier for years without checking whether they’re still getting a competitive deal.
While loyalty may seem convenient, it doesn’t always offer the best value. Energy suppliers regularly introduce new tariffs, and market conditions continue to change throughout the year.
If you’re wondering how often you should compare energy suppliers, this guide explains why regular comparisons are important and when it makes sense to review your options.
Why Comparing Energy Suppliers Matters
Your household circumstances can change over time.
You may:
- Use more or less energy than last year.
- Have moved home.
- Changed your heating system.
- Added an electric vehicle.
- Installed solar panels.
- Seen your fixed tariff come to an end.
Even if none of these apply, new tariffs may become available that better suit your household.
Comparing suppliers helps you understand what’s available and make informed decisions.
When Should Homeowners Compare?
Although once a year is a good rule of thumb, you should also compare if:
- Your fixed tariff is ending.
- Your monthly Direct Debit has increased.
- You receive a tariff renewal letter.
- The Ofgem Energy Price Cap changes.
- You haven’t reviewed your tariff in over 12 months.
Reviewing your options doesn’t mean you have to switch—it simply helps you understand what’s available.
What Should You Compare?
Looking only at the monthly payment doesn’t always give the full picture.
It’s important to compare:
- Unit rates
- Standing charges
- Contract length
- Exit fees
- Customer service
- Renewable energy options
- Smart meter compatibility
Choosing the right tariff is about finding the best overall value for your home.
Does Switching Interrupt Your Energy Supply?
No.
For most homeowners:
- Your gas and electricity continue as normal.
- Your new supplier manages the process.
- No engineer visit is required.
- You’ll receive a final bill from your previous supplier.
Most switches complete within around five working days.
Understand the Ofgem Energy Price Cap
Before comparing tariffs, it’s useful to understand how the Ofgem Energy Price Cap affects standard variable tariffs.
Although the cap limits the maximum rates suppliers can charge customers on default tariffs, it doesn’t always represent the cheapest option available.
Read our guide: What is the Ofgem Price Cap 2026
Learn How to Compare Suppliers Properly
Comparing suppliers isn’t just about finding the lowest monthly payment.
Understanding standing charges, unit rates and contract terms helps homeowners make better long-term decisions.
Read next: How to Compare Energy Suppliers and Save Money in 2026
How Energy Watch UK Can Help
At Energy Watch UK, we help homeowners stay informed about the latest developments in the UK energy market.
Whether you’re comparing tariffs, understanding energy prices or simply looking for practical advice, our guides are designed to make the process clear and straightforward.
You can also visit our:
to learn more about how we support homeowners across the UK.
Frequently Asked Questions
How often should I compare energy suppliers?
Most homeowners should compare energy suppliers at least once every year or whenever their current tariff is ending.
Should I compare even if I’m happy with my supplier?
Yes. Comparing available tariffs helps you understand whether your current deal still offers good value.
Does comparing energy suppliers affect my credit score?
Simply comparing tariffs does not affect your credit score.
How long does switching supplier take?
Most energy supplier switches are completed within approximately five working days.
Is switching energy supplier free?
In many cases, yes. However, always check your current tariff for any applicable exit fees.
About the Author
John – Your Local Energy Watch UK Expert
John is your local Energy Watch UK expert, helping UK homeowners understand energy suppliers, tariffs and household energy costs. His goal is to provide trusted, practical advice that helps homeowners make informed decisions about their home energy.