Switching energy supplier is one of the most straightforward ways to reduce a household bill. It takes about 15 minutes. It's free. It requires no action on the day the switch completes. And yet the majority of UK households have never done it, or haven't done it in years.
Why? And what does that inertia actually cost?
Switching activity in the UK energy market collapsed during the 2021–22 energy crisis, when wholesale prices spiked and suppliers couldn't offer tariffs meaningfully below the price cap. At that point, switching made little financial sense - there was nothing cheaper to switch to.
But the market has changed. Fixed-rate deals are back. Competition between suppliers has returned. And in March 2025, over 344,000 households switched electricity supplier in a single month - an 84% increase on the same month the previous year, and the highest figure in years.
Despite that recovery, the majority of UK households - particularly those in more deprived areas, older households, and renters - remain on standard variable tariffs, tracking the price cap quarter by quarter rather than locking in a competitive fixed deal.
The consequence is measurable. The average saving from switching from a standard variable tariff to a competitive fixed deal has been running at over £200 per year in recent periods. For a family in a larger home with above-average consumption, that figure can reach £400–£500.
When researchers and regulators have surveyed non-switchers, the most common explanations fall into a few categories:
"It's too much hassle." The switching process has actually become significantly simpler over the last decade. Regulatory changes mean the switch itself is handled by the new supplier - you don't need to contact your old one, arrange anything on a particular day, or do anything to your meter. The main task is comparing tariffs and completing an online form. For most people, it takes less time than cancelling a streaming subscription.
"I'll lose supply for a day." This is a misconception. Supply is never interrupted during a domestic energy switch in the UK. The changeover happens at meter level - you won't notice a thing.
"I'll lose my credit balance." Your old supplier is required to refund any credit balance to you, usually within 6–10 weeks of the switch.
"I might get locked into something worse." This is a more reasonable concern, and the answer is to choose carefully. Fixed deals with no exit fees exist - if circumstances change, you can leave. Fixed deals with exit fees (typically £30–£60 per fuel) require more thought about how long you plan to stay.
"I don't know where to start." This is the real barrier for many households. Comparison sites present dozens of tariffs with slightly different unit rates, standing charges, and term lengths. Knowing which one is genuinely cheapest for your specific usage pattern requires more maths than most people want to do.
Price comparison websites have been available for years, and they've helped millions of people switch. But there are structural limitations worth understanding.
The biggest one: most comparison sites calculate savings based on a "typical household" - usually the Ofgem median consumption figure of 3,100 kWh of electricity and 12,500 kWh of gas per year. But your household is not typical. If you work from home, have an electric vehicle, run a heat pump, or simply have a larger or smaller property, your actual consumption could be 40–50% above or below the national average. Comparing against a notional average means the "saving" you're shown could be significantly higher or lower in reality.
There's also an incentive question. Traditional comparison sites earn commission when you switch, which creates a financial interest in recommending specific tariffs over others. This doesn't mean their results are wrong - but it's worth knowing that whole-of-market coverage and commission transparency vary.
Here's a rough illustration of what inertia costs over time.
A household that's been on a standard variable tariff since mid-2023 and hasn't switched has paid cap-level rates throughout. During that period, households that moved to competitive fixed deals saved an average of around £200–£300 per year relative to the cap. Over two years, that's £400–£600 in foregone savings - enough to cover the cost of a modest home improvement or several months of groceries.
The April 2026 cap drop to £1,641 is a good news headline. But even at that level, there are fixed deals available below the cap for many households. The cap protects you from the worst; it doesn't mean you're on the best available deal.
Switching behaviour tends to spike when cap increases are announced. That's the wrong time - it's reactive rather than proactive. The households that save the most are typically those that:
That last point is the hardest to implement without a tool that does it for you.
The reason EnergyScan exists is to remove the friction that stops people acting on what they know.
Most households know they should compare energy deals more regularly. The barrier isn't awareness - it's the time and complexity involved in doing it properly, with real consumption data rather than an assumed average.
Upload one bill and EnergyScan extracts your actual usage, compares it against every available tariff for your region, and tells you precisely what you'd save by switching. Then it monitors the market and alerts you when something better appears - so you don't have to remember to check.
The subscription costs £29 a year. If you find a deal that saves you £200, you've covered the cost on the first switch and saved £171 net. The service pays for itself many times over if you stay on top of it.
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EnergyScan is an independent energy monitoring service. We earn a disclosed commission of £20 per fuel when you switch through us. We never earn more by recommending a more expensive tariff.
Last updated: 2026-03-07.
Upload one bill and EnergyScan will tell you exactly how much you could save — then monitor the market continuously so you never overpay again.