You can sell excess solar electricity back to the grid through the Smart Export Guarantee (SEG) scheme, which legally requires energy suppliers to pay homeowners for surplus renewable energy. The SEG allows you to sell surplus electricity back to the grid and get extra income, with earnings typically between £150 and £800 per year depending on your system size and how much electricity you export Crgdirect. All you need is an MCS-certified solar installation, a smart meter, and to sign up with an approved SEG tariff provider.
Understanding the Smart Export Guarantee (SEG)
What is the Smart Export Guarantee? The Smart Export Guarantee replaced the Feed-in Tariff scheme in January 2020, requiring energy suppliers with over 150,000 customers to offer export tariffs to small-scale renewable generators. Unlike the old scheme, SEG rates are set by individual suppliers rather than the government, creating competition that can benefit homeowners.
Legal Requirements for Energy Suppliers
- All large energy suppliers must offer at least one SEG tariff
- Payments must be above zero pence per kWh
- Suppliers can set their own rates and terms
- Smart meters are mandatory for accurate export measurement
Who Can Benefit from SEG Payments
- Homeowners with solar PV systems up to 5MW capacity
- Small wind turbine owners
- Micro combined heat and power (micro-CHP) generators
- Hydro power installations
- Anaerobic digestion systems
Current SEG Tariff Rates and Earnings
SEG Rate Variations Across Suppliers SEG earnings range from 1.5p per kWh to 12p per kWh, so homeowners should shop around for the best rates. An average household could make between £80 and £110 a year based on a rate of 3.99p per kWh CrgdirectScottish Daily Express. The wide variation in rates makes comparing suppliers essential for maximising returns.
Top SEG Tariff Providers in 2025
- Octopus Energy Outgoing Agile: Variable rates following wholesale prices (can exceed 15p/kWh at peak times)
- Good Energy: Fixed rate around 12p per kWh
- So Energy: Competitive fixed rates around 7-9p per kWh
- EDF Energy: Standard rates around 4-5p per kWh
- British Gas: Basic rates around 3-4p per kWh
Calculating Your Annual SEG Income
- Small system (3kW): £120-£240 annually at 5p/kWh
- Medium system (4kW): £160-£320 annually at 5p/kWh
- Large system (6kW): £240-£480 annually at 5p/kWh
- Export percentage: Typically 40-60% of total generation without battery storage
Eligibility Requirements for Selling Electricity
Essential Technical Requirements
- MCS Certification: Your solar installation must be certified by the Microgeneration Certification Scheme
- Smart Meter: Half-hourly export meter readings are mandatory
- Generation Meter: Separate meter to measure total solar generation
- G99 Grid Connection: Proper grid connection approval from your Distribution Network Operator (DNO)
Installation Size Limits
- Solar PV: Up to 5MW (5,000kW) capacity
- Most domestic installations: 1-10kW range
- No minimum system size requirements
- Larger systems may need additional approvals
Property Types Eligible
- Owned residential properties
- Commercial premises
- Rented properties (with landlord permission)
- New build homes with solar installations
- Retrofit installations on existing properties
How to Apply for SEG Payments
Step-by-Step Application Process
Step 1: Gather Required Documentation
- MCS certificate for your solar installation
- Electrical Installation Certificate (EIC)
- Smart meter installation confirmation
- G99 grid connection approval
- Recent electricity bills
Step 2: Compare SEG Tariffs Research different suppliers’ export rates, payment terms, standing charges, and contract conditions. Consider whether you want fixed or variable rates based on your risk tolerance and market outlook.
Step 3: Contact Your Chosen Supplier Most suppliers offer online applications, though some may require phone calls. You don’t need to use the same supplier for both import and export electricity – you can have separate contracts.
Step 4: Complete Application and Setup Provide all required documentation, agree to terms and conditions, set up payment details for SEG income, and confirm smart meter export readings are working correctly.
Application Timeline Expectations
- Documentation gathering: 1-2 weeks
- Application processing: 2-4 weeks
- First payment: Usually within 3 months
- Ongoing payments: Monthly or quarterly depending on supplier
Maximising Your Export Income
Optimal Export Strategies Time-Based Export Optimisation: Some suppliers offer time-of-use export tariffs where rates vary throughout the day. Peak export rates often occur during evening hours (4-7pm) when demand is highest but solar generation is declining.
Seasonal Export Planning: Solar generation peaks in summer months (April-September) when daylight hours are longest. Winter exports drop significantly, making battery storage more valuable for evening use rather than export.
Energy Usage Pattern Adjustment: The best financial strategy is using solar energy yourself first (saving 28p per kWh on imported electricity) rather than exporting at 5-12p per kWh. Shift high-energy activities like washing machines, dishwashers, and electric vehicle charging to daylight hours.
Battery Storage Considerations Adding battery storage reduces export volumes but increases self-consumption rates from 30-40% to 70-80%. While this decreases SEG income, it typically provides better overall financial returns by maximising the value of self-consumed solar electricity.
Smart Home Integration
- Programmable appliances to run during peak solar generation
- Electric vehicle charging during daylight hours
- Heat pump operation during sunny periods
- Smart hot water heating systems
Technical Setup for Export Metering
Smart Meter Requirements Your export supplier will arrange smart meter installation if you don’t already have one. The meter must record half-hourly export data and transmit readings automatically to your supplier for accurate payment calculation.
Generation vs Export Metering
- Generation meter: Records total solar electricity produced
- Export meter: Records only electricity sent to the grid
- Import meter: Records electricity drawn from the grid
- Most modern installations use combined import/export smart meters
DNO Notification and Approval Your installer should handle Distribution Network Operator notifications, but you may need to inform them of any system changes. Systems under 3.68kW typically need only notification, while larger systems require formal approval.
Payment Methods and Timing
SEG Payment Frequencies
- Monthly payments: Most convenient for cash flow
- Quarterly payments: Standard for many suppliers
- Annual payments: Less common but sometimes offer rate bonuses
- Credit to electricity bills: Alternative to cash payments
Payment Calculation Methods Suppliers use actual smart meter readings where possible, but may estimate payments between readings. Always check statements for accuracy and query any discrepancies promptly.
Tax Implications of SEG Income For domestic properties, SEG payments are generally not subject to income tax as they’re considered a reduction in household running costs rather than business income. However, if you have a large commercial installation or claim Business Asset Rollover Relief, different rules may apply.
Common Issues and Solutions
Low Export Rates Problems If your SEG payments seem low, check that your smart meter is recording exports correctly, verify you’re on the best available tariff rate, and ensure your solar system is performing as expected without shading or technical issues.
Switching SEG Suppliers You can change SEG suppliers independently of your electricity import supplier. Compare rates regularly as new tariffs launch frequently. Some suppliers offer bonuses for switching, but always calculate the total annual value.
Export Payment Disputes Keep records of your solar generation and export data from monitoring systems. If payments don’t match your expectations, contact your supplier with evidence. Ofgem can help resolve disputes if suppliers don’t respond appropriately.
Future of Solar Export Payments
Market Trends and Opportunities The SEG market continues evolving with new time-of-use tariffs, seasonal variations, and innovative payment structures. Some suppliers now offer premium rates for guaranteed renewable electricity or local energy trading schemes.
Technology Integration Vehicle-to-grid (V2G) technology and smart home systems will create new opportunities for optimising export timing and maximising income. Battery storage costs continue falling, making combined solar-battery systems more attractive.
Regulatory Changes The government continues reviewing the SEG scheme to ensure it supports renewable energy growth while providing fair returns to households. Future changes may include minimum payment rates or additional support for energy storage.
Additional Frequently Asked Questions
Can I sell electricity without a smart meter? No, smart meters are mandatory for SEG payments as they provide the half-hourly export readings required for accurate payment calculations. Traditional meters cannot distinguish between imported and exported electricity.
Do I need planning permission to sell electricity? Most domestic solar installations qualify as permitted development requiring no planning permission. However, listed buildings, conservation areas, and some flat roof installations may need approval.
Can tenants sell solar electricity? Private tenants can apply for SEG payments if they have written landlord permission and the solar installation is properly certified. The property owner typically needs to be named on the application.
What happens to SEG payments if I move house? SEG contracts are tied to the property address and installation, not the homeowner. When selling your home, you’ll need to inform your SEG supplier and the new owners can continue receiving payments or switch suppliers.
Can I have different suppliers for import and export? Yes, you can have separate contracts for buying and selling electricity. This allows you to choose the best import rates from one supplier while maximising export income with another.
How do I track my solar exports? Most solar inverters include monitoring systems showing generation and export data. Smart meter displays also show export readings, and many suppliers provide online portals or apps for tracking payments and energy flows.
