British Gas vs Octopus Energy Summer 2026: Which Is Cheaper After the 13% Cap Rise?

Ofgem has confirmed that the default tariff price cap will rise by about 13% from 1 July 2026, lifting the typical dual fuel direct debit bill to around £1,663 a year. Both British Gas and Octopus Energy will move their standard variable tariffs in line with the cap, which means the headline price on a default deal is effectively the same at either supplier.

That makes the comparison less about pure pence per kilowatt hour and more about everything else: fixed price contracts, time of use tariffs for smart meter customers, payment options, complaints handling and how each company treats vulnerable customers. This guide walks through each of those factors so you can decide which supplier suits your household better after the cap rise.

Headline comparison after the new cap

From 1 July 2026 the cap sets a typical annual bill at around £1,663 for a dual fuel customer paying by direct debit on a standard variable tariff. Standing charges and unit rates vary by region, but the Ofgem cap applies to both British Gas and Octopus Energy because both sell default tariffs to a national customer base.

If you are on a default standard variable tariff with either supplier, the unit rate and standing charge you pay are capped at the Ofgem level for your region and payment method. That means the standard variable comparison comes down to nuances like billing cadence, direct debit review behaviour and how each supplier handles credit balances rather than headline price.

Both suppliers publish their unit rates and standing charges in advance of each cap window. If you want to verify the figures for your postcode and payment method, Ofgem maintains a price cap unit rates and standing charges page that lists the maximum each supplier can charge per region.

Standard variable tariff side by side

The standard variable tariff at British Gas and the equivalent Flexible tariff at Octopus Energy are both subject to the Ofgem cap. Customers on these tariffs do not have a fixed end date and can switch away at any time without an exit fee.

On payment method, both suppliers charge more for prepayment and standard credit (pay on receipt of bill) than direct debit, in line with the cap structure. The cheapest way to pay either supplier is by monthly direct debit and accurate meter reads, ideally via a smart meter that automatically sends usage data.

Octopus offers a referral credit when a new customer signs up through an existing customer link, which can offset part of the first year cost. British Gas runs periodic loyalty offers for existing customers, particularly those bundling boiler cover.

Fixed tariff options from each supplier

Both suppliers offer fixed tariffs that lock in unit rates and standing charges for a defined period, typically 12 or 24 months. A fix protects you if the cap rises again at the next quarterly review but means you pay above the cap if rates fall.

Octopus Energy regularly publishes fixed deals through its own customer portal and via comparison sites. The headline fix from Octopus has at times sat below the prevailing cap, particularly for customers willing to commit to longer terms. Exit fees apply if you leave a fix early.

British Gas offers fixed deals branded as Fixed Energy or similar, often with optional add-ons such as boiler service or HomeCare. Read the small print for exit fees, which can range from around £75 to £150 per fuel depending on the deal.

Before fixing, compare your projected use against the fix price using a recent year of bills. Citizens Advice publishes guidance on how to weigh up a fix and there are free calculators on gov.uk and moneyhelper.org.uk that work out break-even points.

Customer service and complaints record

Ofgem holds licence performance data on every supplier, and the Energy Ombudsman publishes complaints volumes through its quarterly updates. The Citizens Advice supplier star rating combines complaint handling, customer service and ease of contact into a single score.

Across recent league tables Octopus has consistently ranked at or near the top, particularly on responsiveness and complaint resolution times. British Gas typically sits in the middle of the pack on Citizens Advice scoring, reflecting its size and a higher absolute complaint volume.

If a complaint is not resolved within eight weeks, customers of either supplier can escalate to the Energy Ombudsman free of charge. The Ombudsman can require the supplier to apologise, fix the underlying problem and pay compensation up to a defined limit.

Smart meter and time of use tariffs

Both suppliers support smart meters and offer time of use tariffs for customers with the right meter type and a stable connection. The economics of a time of use tariff depend heavily on when you use electricity rather than the supplier brand.

Octopus runs several time of use propositions including Agile and Intelligent Octopus. Agile rebases the half-hourly unit price each day from wholesale data, which can deliver very low rates overnight but means daytime peak prices can be high. Intelligent Octopus is targeted at electric vehicle owners and provides cheap overnight charging windows.

British Gas offers an Electric Driver tariff and a PeakSave product that rewards customers for shifting use away from peak hours on specific event days. These tariffs are less aggressive than Agile but easier to plan around for most households.

If you own an electric vehicle, a heat pump or a battery, a time of use tariff can materially undercut a flat rate cap tariff over a year. If your use is concentrated in evening peak hours, a flat rate may still be cheaper.

Who should pick which

If you want the simplest service, a national brand and the option to bundle boiler cover, British Gas is the more established choice. Its in-person customer support footprint is larger and its bundled services may suit homeowners with older heating systems.

If your priority is responsive digital service, an active referral programme and access to flexible time of use tariffs, Octopus is the stronger fit. Smart meter customers in particular get more upside from Octopus because of the breadth of its time of use range.

On price alone, the cap means the default standard variable rates are effectively the same. Real savings come from picking the right tariff structure for your usage pattern, not from picking the brand.

Frequently asked questions

Is British Gas cheaper than Octopus Energy after the July 2026 cap rise?

On default standard variable tariffs both suppliers are bound by the same Ofgem cap level for each region and payment method, so the headline rate is effectively the same. Differences come from fixed tariffs, time of use deals and referral credits.

Will the Ofgem cap go down later in 2026?

Ofgem reviews the cap every three months. The next change after the July 2026 cap window takes effect on 1 October 2026. Direction of travel depends on wholesale gas and electricity prices, network costs and policy costs. Ofgem publishes a quarterly summary letter with details.

Should I switch from British Gas to Octopus or vice versa?

Switching only saves money if the new tariff is cheaper for your specific usage pattern. Use a year of bills and a free price comparison tool to compare a fix at either supplier against your current rate before switching.

Do I pay an exit fee if I leave a fix early?

Most fixed tariffs charge an exit fee, typically £75 to £150 per fuel. Standard variable and default tariffs at either supplier have no exit fee.

Are smart meters required to get a time of use tariff?

Yes. Both Agile Octopus and British Gas PeakSave require a smart meter capable of half hourly readings. If your meter cannot send half hourly data, the supplier will need to upgrade or replace it before you can join the tariff.

Where can I check live cap rates for my region?

Ofgem publishes regional cap rates and standing charges in a dedicated unit rates and standing charges page. Your supplier must also display your applicable unit rate and standing charge on every bill.