British Gas Renewable Energy and Sustainability Guide

British Gas renewable energy comes from a mix of company-owned and contracted generation, and any electricity sold as “renewable” must be backed by Renewable Energy Guarantees of Origin (REGO) certificates under Ofgem rules. For a bill-conscious household on a standard variable tariff, the practical question is whether a green label changes what you pay, and it usually does not on its own.

Free Price Compare tracks Ofgem, the energy price cap and supplier tariffs so you can weigh sustainability and cost together rather than treating them as separate decisions. This explainer covers how British Gas sources its power, what its green claims actually mean, and how to compare a renewable tariff against the current price cap before you switch.

Last updated: August 2026

Written by the Free Price Compare editorial team | Reviewed August 2026

What does British Gas renewable energy actually mean?

British Gas renewable energy refers to electricity that the supplier matches with Renewable Energy Guarantees of Origin (REGO) certificates, a scheme run by Ofgem that proves a unit of power was generated from a renewable source such as wind, solar or hydro. Electricity from every supplier travels through the same National Grid, so the power in your sockets is physically identical whether your tariff is labelled green or not. What a renewable tariff guarantees is that for each unit you use, a matching unit of certified renewable generation was fed into the grid over the year. That distinction matters because a “100% renewable” claim is an accounting and certification statement, not a promise that your specific home is wired to a wind farm.

British Gas, owned by Centrica, sources power from a combination of its own generation assets, long-term contracts and purchased certificates. Its published fuel mix shows a mix of renewables, nuclear, gas and other sources, so it is best to check the latest disclosure for the current split. If certified renewable supply matters to you, check the supplier’s current fuel-mix disclosure, which every licensed supplier must publish each year.

How much of British Gas electricity is renewable?

British Gas sources a substantial share of its electricity from renewables, but it has not published a verified figure showing 100% renewable supply for every domestic customer, so treat any single percentage cautiously. Suppliers report their fuel mix annually, and the renewable proportion can shift year to year as contracts and certificate purchases change. The honest position for a household is that the exact split is published by the supplier and can be compared with the national average, but it does not affect the price you pay per unit unless the tariff itself is priced differently.

Certificates alone do not build new wind farms, which is a fair criticism of green tariffs generally. If your priority is funding new generation rather than certified matching, look at whether a supplier invests directly in renewable assets or offers products tied to on-site generation. For most households, the sustainability gain from cutting consumption is larger and more certain than the difference between one green tariff and another, and our guide on smart ways to cut energy costs in the UK sets out where the savings actually sit.

Compare current home energy tariffs

Does a green energy tariff cost more than the price cap?

A green energy tariff can cost more, less or about the same as the price cap, because the price is driven by wholesale costs and the tariff type, not by the renewable label. The July to September 2026 price cap sets electricity at 26.11p/kWh with a 57.19p/day standing charge, and gas at 7.33p/kWh with a 29.04p/day standing charge for a typical Direct Debit customer, according to Ofgem figures published on 24 August 2026. The cap limits unit rates and standing charges for a typical user, not your total bill, which still depends on how much you use.

A fixed renewable tariff locks your unit rates for the contract term. Whether that beats the variable cap depends on where wholesale prices go. When the cap is expected to rise, a fixed deal below the cap can save money; when the cap is falling, a fixed deal can leave you paying more. Our explainer on how fixed tariff pricing is affected by the energy price cap shows how to run that comparison properly.

Figures are indicative and may change; check the latest Ofgem announcement before switching.

See how a fixed deal compares to the cap

Weigh a renewable fixed tariff against the current variable price cap before you commit.

Compare energy deals

Is Octopus energy cheaper than British Gas?

Whether Octopus is cheaper than British Gas depends entirely on the specific tariffs compared and your usage, not on the supplier name, because both offer variable tariffs tracking the price cap and fixed deals priced against wholesale forecasts. When both sell a standard variable tariff, the unit rates are held close to the same Ofgem cap, so the difference on a variable tariff is usually small. Real gaps appear on fixed deals and add-ons, where each supplier prices differently and offers change frequently.

The only reliable way to answer “is Octopus cheaper than British Gas” for your home is to enter your postcode and usage and compare live quotes on the day. A supplier that is cheaper for a high-usage household in one region is not automatically cheaper for a low-usage flat elsewhere. Service quality, exit fees and cover add-ons also vary, and our guide on what matters beyond just price on energy tariffs covers the non-price factors worth weighing.

Is sustainability more important than net zero?

Sustainability and net zero are complementary rather than competing goals: net zero is the target of balancing greenhouse gas emissions to zero by 2050 under UK law, while sustainability is the broader practice of using resources responsibly so the target holds over time. For a household, the practical overlap is simple. Cutting the energy you waste lowers both your carbon footprint and your bill, and it does so with certainty, whereas the carbon benefit of switching between two REGO-backed tariffs is harder to pin down.

British households using less gas and electricity has a direct effect on emissions, because less demand means less fossil generation is called on the grid. That is why efficiency measures often deliver a bigger environmental return per pound than the choice of green tariff. Reducing standby draw and appliance running costs is a good place to start, and our guide on the hidden cost of standby power quantifies where those quiet losses build up.

Check ways to lower your energy use

How does British Gas support solar and on-site renewables?

British Gas supports on-site renewables through solar installations and, for eligible business customers, a Power Purchase Agreement (PPA) model where a partner funds, installs and maintains solar and battery equipment. In August 2026 British Gas launched Fixed Solar Saver, a business electricity plan for SMEs that pairs on-site solar and battery storage with a long-term PPA and says eligible businesses can save up to 20% on electricity costs on average, with indicative unit rate savings of around 20% compared with a standard fixed-price contract. That product is for small businesses, not households, so it sits outside a domestic switch.

For homeowners, the domestic routes to on-site generation are rooftop solar with the Smart Export Guarantee, which pays you for surplus electricity exported to the grid, and installation via a Microgeneration Certification Scheme (MCS) accredited installer. Solar makes the biggest difference for homes with high daytime use or battery storage. Our guide on the environmental benefits of solar panels explains the carbon and cost case, and the Smart Export Guarantee replaced the older Feed-in Tariff for new installations.

Should you switch from a standard variable tariff?

Switching from a standard variable tariff is worth checking if a fixed deal sits below the current price cap and you value certainty over the contract term, since variable tariffs move with each cap review. Ofgem confirmed the cap for 1 July to 30 September 2026 rose 13% on the previous quarter, and the next cap applying from 1 October 2026 was due to be announced in late August 2026, so the direction of the cap is central to the decision. If the cap is set to rise, locking a fixed rate below it can protect you; if it is set to fall, staying variable or picking a shorter fix keeps you flexible.

Before switching, check exit fees on any current fixed deal and the switching terms of the new one. A green fixed tariff is only worth choosing over a cheaper conventional fix if the certified renewable supply matters to you and the price difference is one you accept. Our British Gas exit fees and switching guide covers the charges to watch, and Ofgem’s switching protections mean a switch completes within a set timeframe with cover if anything goes wrong.

Compare fixed and variable energy deals

• British Gas Exit Fees & Switching Guide: Avoid Extra Charges
• E.ON Next Business Energy Tariffs & Prices
• How Fixed Tariff Pricing is Affected by the Energy Price Cap
• British Gas Energy Tariffs 2025: Best Fixed & Variable Deals
• Energy Tariffs: What Matters Beyond Just Price

Information correct as of 24 August 2026. Prices, tariffs, policy details and providers change frequently, so please check the latest details before making a decision. This article is for general information only and does not constitute financial advice. Free Price Compare is authorised and regulated by the Financial Conduct Authority (FCA).