Understanding Smart Export Guarantee for Business
The Smart Export Guarantee (SEG) provides UK businesses with the opportunity to earn revenue from excess solar electricity exported to the grid. Unlike the Feed-in Tariff scheme which closed to new applicants in 2019, SEG is designed for modern commercial solar installations and requires half-hourly metering for accurate export measurement.
Under SEG regulations, electricity suppliers with 150,000 or more domestic customers must offer export tariffs to businesses generating renewable electricity. For commercial solar installations, this creates a valuable revenue stream that can significantly improve project economics when combined with on-site consumption savings.
Commercial SEG eligibility requires installations to be certified under the Microgeneration Certification Scheme (MCS) or equivalent standards, with systems up to 5MW capacity qualifying for the scheme. Businesses must have appropriate export metering installed to measure electricity flowing back to the grid.
2026 SEG Tariff Rate Comparison
Commercial export tariff rates vary significantly between energy suppliers, with rates typically ranging from 3p to 8p per kWh for standard SEG tariffs. Time-of-use tariffs can offer higher rates during peak demand periods, sometimes reaching 12p to 15p per kWh during winter evening peaks.
Major energy suppliers currently offering competitive commercial SEG rates include British Gas, E.ON Next, EDF Energy, and Octopus Energy. Independent suppliers often provide more competitive rates but may have different contract terms and eligibility criteria.
Export tariff rates are influenced by wholesale electricity prices, grid demand patterns, and supplier commercial strategies. The increasing penetration of renewable generation means export values can vary significantly throughout the day, with negative pricing occasionally occurring during periods of high renewable output and low demand.
Premium Export Tariff Options
Some suppliers offer enhanced export tariffs for businesses that can provide grid services or flexible export timing. These arrangements may include higher rates in exchange for export curtailment capabilities or participation in demand response programmes.
Fixed vs Variable Export Rates
Fixed export rates provide predictable revenue streams, typically offering rates that remain constant for 12 to 24 months. These arrangements suit businesses requiring certainty for financial planning and investment appraisal purposes.
Variable export tariffs track wholesale electricity markets more closely, potentially offering higher returns during periods of strong electricity demand but introducing revenue uncertainty. Time-of-use variable tariffs can maximise export value by aligning payments with grid demand patterns.
Many businesses choose fixed rates for base export volumes while using variable tariffs for additional export capacity. This hybrid approach balances revenue certainty with upside potential from market price movements.
Seasonal Rate Variations
Export rates often reflect seasonal electricity demand patterns, with winter rates typically higher than summer rates due to increased heating demand. Solar generation peaks during summer months when export rates are generally lower, affecting overall project returns.
Export Metering and Half-Hourly Settlement
Commercial SEG participants must install appropriate export metering capable of half-hourly measurement and settlement. This requirement enables accurate tracking of export volumes and alignment with wholesale electricity market pricing periods.
Half-hourly meters record electricity flows in 30-minute intervals, allowing suppliers to calculate payments based on actual export timing rather than averaged daily or monthly volumes. This measurement accuracy is essential for time-of-use tariff calculations.
Export meter installation must be completed by qualified electricians working to current metering standards. The meter operator is responsible for collecting and validating export data, which is then used for settlement calculations with the chosen export tariff supplier.
Data Collection and Reporting
Export data is typically collected remotely through smart metering infrastructure or periodic manual readings. Businesses should ensure reliable data communication to avoid delays in export payments or settlement disputes.
Maximising Export Revenue Strategies
Optimising export revenue requires careful consideration of energy consumption patterns, storage options, and tariff structures. Businesses can maximise returns by aligning high-value export periods with available generation capacity.
Battery energy storage systems can shift solar generation from low-value to high-value export periods, potentially increasing export revenue by storing excess daytime generation for evening peak periods. However, storage system costs must be weighed against potential export revenue improvements.
Load shifting strategies involve moving flexible electricity demand to coincide with solar generation periods, reducing export volumes while maximising on-site consumption value. This approach typically provides better returns than export tariffs alone.
Contract Optimisation
Regular review of available export tariffs ensures businesses capture the best available rates as market conditions change. Export contracts can typically be switched annually, allowing businesses to take advantage of improved tariff offerings.
Contract Terms and Switching Providers
Commercial export contracts typically include minimum term commitments, payment schedules, and performance guarantees. Standard contracts range from 12 to 36 months, with automatic renewal clauses common across the industry.
Payment terms vary between suppliers, with monthly or quarterly payments typical for commercial arrangements. Some suppliers offer annual payment options that may include early payment discounts or preferential rates.
Switching between export tariff providers usually requires 30 to 90 days notice, depending on contract terms. The switching process involves meter reading coordination and settlement period adjustments to ensure accurate payment transitions.
Due Diligence Considerations
When evaluating export tariff providers, businesses should consider supplier financial stability, customer service quality, and technical support capabilities. Smaller suppliers may offer attractive rates but could present higher counterparty risks for long-term contracts.
Contract terms should include clear provisions for tariff rate changes, meter reading responsibilities, and dispute resolution procedures. Professional legal review is advisable for significant commercial export contracts or complex arrangements involving multiple sites.
