Clocks Going Forward, 29 March 2026: What It Actually Does to Your Energy Bill
British Summer Time starts on 29 March 2026. Lighter evenings genuinely cut lighting and heating demand, but by less than most people assume — the real numbers, and where the savings actually show up.
What the clock change does and doesn't do
Moving the clocks forward an hour doesn't change how much daylight there is in total — it shifts when it falls, giving a lighter evening at the cost of a darker morning. The genuine energy saving through spring comes from the days getting objectively longer as the season progresses, which happens whether or not the clocks move; the clock change just realigns waking hours with when that extra daylight is most useful (evenings, when lighting and often heating demand is highest).
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| Driver | Effect through spring |
|---|---|
| Longer evening daylight | Less need for lighting from roughly 5pm-8pm |
| Milder outdoor temperatures | Bigger driver of falling heating demand than daylight |
| Ofgem price cap review (April) | Often the larger, one-off change to the actual bill |
| Clock change itself | Realigns daylight to evenings — a small, gradual effect, not a step change |
Why the April price cap matters more day to day
Because Ofgem reviews and resets the default tariff price cap every quarter (January, April, July, October), the number that actually appears different on an April bill is frequently driven more by that quarterly reset than by the clocks — worth checking the current cap rather than assuming any bill change in spring is purely down to daylight.
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- gov.uk: When the clocks change
- Ofgem: Energy price cap
Frequently asked questions
When do the clocks go forward in 2026?
The UK moves to British Summer Time on Sunday 29 March 2026, when clocks go forward one hour at 1am.
Does clocks going forward actually reduce energy bills?
Yes, but modestly and gradually. The bigger saving comes from lengthening daylight hours through spring generally reducing lighting and heating demand in the evening, rather than the clock change itself causing an overnight drop — the clock change is really a marker of the seasonal trend, not the cause of it.
Is the Ofgem price cap likely to change around the same time?
The Ofgem price cap is reviewed quarterly (each January, April, July and October), so the April price cap update lands close to the clock change and is usually the bigger driver of any actual bill change around this time of year, separate from the clocks themselves.
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