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UK home energy in 2026: what actually drives your bill

A typical UK dual-fuel household pays a bill made up of three components: a standing charge for each fuel (a daily fixed cost regardless of usage), a unit rate in pence per kWh for the gas and electricity actually used, and VAT at 5%. Every other line on a bill — environmental obligations, network charges, supplier costs — is already wrapped into the unit rate or standing charge. The point of switching is to lower the unit rate or standing charge, or both, against your specific usage profile.

The price cap and what it actually caps

Ofgem’s Default Tariff Cap (better known as the price cap) sets a maximum unit rate and standing charge that suppliers can charge a customer on a default tariff — broadly, anyone who hasn’t actively chosen a fixed deal. The cap is reviewed every three months and announced roughly six weeks ahead of the period it applies to. The widely-quoted “cap” figure that appears in the news is a model bill for a typical-consumption dual-fuel household paying by direct debit; the actual maximum that applies to your bill depends on your region (electricity standing charges in particular vary by distribution-network area), your meter type, and how you pay.

The cap doesn’t cap fixed-rate tariffs. Suppliers can offer fixed deals above or below the cap; in 2023 most fixed deals sat above the cap (so switching off the cap meant paying more), and from late 2024 onwards the gap has narrowed and reversed for some products, which is why an active comparison is back to being worthwhile for many households.

Fixed versus variable: the trade-off, in plain numbers

A fixed-rate tariff locks your unit rate and standing charge for a defined period (commonly 12 or 24 months). A variable tariff — which is what the price cap applies to — can move at each cap reset. The decision rule isn’t complicated: a fix is worth taking if it’s priced below your expected average over the fix term, accounting for forecast cap movements. Cornwall Insight and other independent forecasters publish wholesale-price-implied cap projections; many comparison engines surface a “projected saving versus cap” figure rather than a single point-in-time saving for this reason. If a fixed deal is priced more than 5% above the current cap, it’s only worth taking if you have a strong view that wholesale prices will rise sharply during the term.

Standing charges and why they vary so much by region

UK electricity standing charges have risen significantly since 2022 to cover the costs of failed-supplier rescues, network reinforcement and policy levies that used to be smeared into unit rates. They differ by region because Ofgem regulates 14 distribution-network areas separately. North Wales and Mersey, parts of Scotland and the South West typically sit at the higher end; London tends to sit lower. Switching supplier doesn’t change your network area, but it does affect the rate the supplier passes through to you, and a few suppliers offer no-standing-charge tariffs that can be worth the trade-off if your usage is genuinely low.

Smart meters, half-hourly tariffs and time-of-use deals

The UK smart-meter rollout is now well past the halfway mark in homes (DESNZ figures put smart and advanced meters above 60% of domestic premises). A working SMETS2 smart meter is the gateway to time-of-use tariffs — Octopus Agile, EDF’s GoElectric, British Gas’s PeakSave and equivalents — that can dramatically lower bills for households that can shift major loads (EV charging, dishwashers, tumble dryers) into off-peak windows. They also make Economy 7 and Economy 10 night-rate tariffs much easier to manage. If your smart meter isn’t communicating, ask your current supplier to fix it before you switch; once a meter is “dumb” for an extended period, the next supplier inherits the problem.

Prepayment, credit and the protections that come with each

If you’re on a prepayment meter (PPM), the historical rate disadvantage is largely closed: Ofgem’s 2023 levelling rules mean PPM unit rates and standing charges are now broadly aligned with credit-meter equivalents under the cap. PPM customers can still switch supplier, and many can request a switch from prepay to credit (a credit check applies) once they’ve been on supply for a defined period. If you’re struggling to top up, suppliers are required under Ofgem rules to offer additional support credit and to refer you to debt advice; the government-backed service is MoneyHelper.

When switching is the wrong move

Switching isn’t always the answer. If you have an outstanding debt of more than £500 with your current supplier, an objection can block a switch until that balance is resolved. If you’re registered on the Priority Services Register and rely on accessibility support, check that the new supplier carries the same protections forward. And if your existing fixed deal still has more than three months to run at a rate at or below the current cap, the early-exit fee will usually outweigh the saving from switching now — better to set a calendar reminder for 30 days before your contract ends and compare again then.

If you’d rather use an Ofgem-accredited domestic-energy comparison site, the regulator maintains its energy-advice guidance on its website. SaveCompare isn’t currently a Confidence Code signatory; switches arranged through this site are handled by an Ofgem-aware switching partner. We disclose that in full on our methodology page.

Last reviewed: April 2026. Sources: Ofgem Default Tariff Cap announcements; DESNZ Smart Meter rollout statistics; Cornwall Insight forecast notes; MoneyHelper consumer guidance. Full citations and partner relationships on our methodology page.