British Gas Export SEG Tariff Guide: Rates and Eligibility Rules

Key Takeaways

• British Gas operates as a mandated Smart Export Guarantee licensee offering tiered export tariffs based on system capacity and customer status.
• The Export Premium tariff applies to British Gas electricity customers with renewable generation systems up to 15kW.
• Systems exceeding 15kW qualify for the Export Extra tariff, while non-supply customers and developers receive standard baseline export rates.
• Eligible renewable technologies include solar PV up to a 5 MW maximum capacity, or up to 50 kW for micro-CHP installations.

How does the British Gas Smart Export Guarantee scheme operate?

The Smart Export Guarantee is a UK government scheme designed to compensate domestic and commercial properties that generate low-carbon electricity and export unused energy back to the national distribution network. British Gas Trading Limited is registered as a mandated SEG licensee under statutory Ofgem regulations, requiring the supplier to provide an export route to qualifying generators across Great Britain.

When your solar array generates electricity, any surplus energy not immediately consumed by domestic appliances is routed through your meter onto the distribution grid rather than going to waste. Your smart meter logs exported kilowatt-hours separately from imported power, and British Gas calculates your financial disbursement based on your contracted export tariff rate.

To explore how the national framework operates across licensed energy retailers, consult our guide to the Smart Export Guarantee explained.

British Gas export tariff options: Premium vs Extra vs Standard

British Gas segments its export offering according to customer relationship and generation capacity.

To qualify for the preferential rates on Export Premium and Export Extra, British Gas must be the active electricity supplier for your property. Properties that take electricity supply from an alternative provider can still register for SEG payments with British Gas, but they are enrolled on the baseline Export SEG tariff.

If you subsequently transfer your domestic electricity supply to an alternative supplier, British Gas automatically reassigns your account to the baseline Export tariff from the effective date of the supply switch.

Guidance on evaluating competing supplier contracts is available in our analysis of how to choose a SEG tariff.

Capacity ceilings and battery storage integration

The British Gas SEG framework accommodates residential rooftop installations as well as larger commercial generation plants, subject to statutory limits:

• Capacity ceiling: Under the governing regulations, generators are compensated for exports up to the maximum capacity of a 5 MW generation system, or up to 50 kW for micro-CHP generation.
• Standard domestic sizing: In typical residential applications, arrays such as a 4kW solar system with an annual output benchmarked against typical domestic demand (such as 2,700 kWh per year) operate comfortably within the 15kW threshold for Export Premium.
• Battery storage pairing: Households pairing solar arrays with home battery storage can export stored electricity back to the grid. Any surplus energy generated by your panels or discharged from your battery qualifies for payments under the scheme.
• No volumetric limits: Your tariff pays an agreed unit rate for every kWh exported to the grid without artificial monthly caps on total energy exported.

For technical specifications regarding export-capable metering devices, see our smart export guarantee metering guide.

Application and eligibility requirements

Applying for a British Gas export tariff requires documentation confirming regulatory and technical compliance:

1. MCS or equivalent certification: Your solar generation system must be installed and commissioned by an accredited professional adhering to MCS installation standards.
2. DNO notification confirmation: The system must have completed formal grid connection notification under ENA Engineering Recommendation G98 for micro-generation, or formal approval under G99 for larger systems.
3. Dedicated smart meter: You must have an operational smart meter (such as a SMETS2 device) that independently logs export consumption.
4. Feed-in Tariff separation: In accordance with UK statutory rules, you cannot receive SEG export payments on an installation that is already claiming Feed-in Tariff (FiT) export payments.

Detailed regulatory provisions are reviewed in our SEG supplier rules guide.

Smart meter validation and initial reading checks

Ensuring that your smart meter is correctly communicating with national data networks prevents delays during British Gas onboarding:

• Export register configuration: Confirm that your electricity smart meter is configured to record exported energy on a dedicated cumulative register. While all second-generation smart meters (SMETS2) include export capability, some meters require over-the-air configuration from the supplier to enable automated half-hourly export logging.
• Separation of import and export billing: Under the British Gas billing architecture, import electricity supply and export generation credits are maintained on separate ledgers. This administrative division ensures that changes to domestic import rates or price cap adjustments do not alter contracted export unit rates.
• Reading submission for non-communicating meters: Where smart meters temporarily experience communication dropouts, British Gas allows homeowners to submit manual photographs of the physical export register to ensure continuous payment calculation.

Switching and closing your British Gas export account

If you decide to switch your export contract to an alternative SEG licensee offering dynamic or wholesale-linked pricing, the process is coordinated through the industry settlement network. Your new export provider notifies British Gas of the transfer, triggering a final export meter reading request to settle outstanding credits before closing the export account.