Smart Export Guarantee (SEG) Explained: Selling Solar Electricity in the UK (2026)

Solar panels often generate surplus electricity that cannot be consumed by your home right away. This generally happens around midday, when solar panels are at full power and many homes are empty. There are two main ways to manage this surplus production:

• Storing energy in a solar battery and using it later.
• Exporting to the grid: Sending unused energy to the National Grid in exchange for payments through the Smart Export Guarantee (SEG). In other words, your energy supplier pays you for excess production from your photovoltaic (PV) system.

A residential battery storage system can cost upwards of £5,000. With the Smart Export Guarantee, you receive payments for electricity you export to the grid, making battery storage optional rather than essential. You can go solar at a lower upfront cost and still benefit from all the electricity your panels generate.

The UK has used different schemes over the years to compensate solar panel owners for exported electricity:

• Feed-in Tariff (FiT) – Closed to new applicants since March 2019
• Smart Export Guarantee (SEG) – The current scheme, launched January 2020
• Export tariffs – General term for payments received for exported electricity

In this article, we’ll discuss how the Smart Export Guarantee works and how it benefits UK homeowners who install solar panels.

How Does the Smart Export Guarantee Work?

The Smart Export Guarantee requires licensed electricity suppliers with more than 150,000 customers to offer at least one export tariff to small-scale generators, including households with solar panels. Here’s how it works:

• You need a smart meter (or advanced meter capable of recording half-hourly export data) to participate in the SEG. Your energy supplier must install one free of charge if you request it.
• Your exported electricity is measured in half-hourly intervals. At the end of each billing period, you receive payment based on the total kilowatt-hours exported multiplied by your SEG tariff rate.
• You can choose any SEG supplier – you don’t have to use the same company that supplies your electricity. This means you can shop around for the best export rates.

Unlike the old Feed-in Tariff, the SEG doesn’t guarantee a specific rate. Suppliers set their own tariffs, which means rates vary significantly. As of 2026, SEG rates typically range from 4p to 15p per kWh, with some suppliers occasionally offering promotional rates above this range.

It’s important to understand that SEG rates are considerably lower than the electricity you’d pay to import from the grid (currently around 24.5p/kWh under the price cap). This means:

• Using solar electricity directly saves you approximately 24.5p per kWh.
• Exporting solar electricity earns you only 4-15p per kWh.
• Maximising self-consumption is more valuable than maximising exports.

SEG vs Feed-in Tariff: What’s the Difference?

The Feed-in Tariff (FiT) was the UK’s original solar incentive scheme, running from 2010 until it closed to new applicants in March 2019. Understanding the differences helps explain why the economics of solar have changed:

The FiT was considerably more generous because it paid you for all electricity generated, regardless of whether you used it or exported it. The SEG only pays for exported electricity, which is typically 20-50% of total generation for homes without batteries.

However, the economics of solar still work well in 2026 because installation costs have fallen dramatically whilst electricity prices have risen sharply. The savings from using solar electricity directly now outweigh the reduction in export payments.

Current SEG Tariff Rates in 2026

SEG rates vary between suppliers and change frequently. Here’s an overview of the types of tariffs available:

Some notable SEG offerings include:

• Octopus Energy – Offers both fixed and variable (Agile) export tariffs, with rates that can spike during peak demand periods
• EDF – Competitive fixed rates for solar exporters
• E.ON – Various SEG options depending on whether you’re also an E.ON customer
• British Gas – SEG tariff available to all, not just British Gas customers
• Ovo Energy – Competitive rates with easy online signup

You can compare current SEG rates using tools like the Solar Energy UK SEG comparison. Since rates change regularly, it’s worth reviewing your options every 6-12 months and switching if better deals become available.

How Much Can You Earn from the Smart Export Guarantee?

Your SEG income depends on three factors: how much electricity you export, your self-consumption rate, and your chosen SEG tariff. Here’s what typical UK households might expect:

Your self-consumption rate significantly affects SEG income. Here’s how different rates impact a typical 4kW system:

Notice that higher self-consumption means lower SEG income but higher total benefit. This is because using electricity directly saves you 24.5p/kWh, whilst exporting only earns 10p/kWh (in this example). This is why battery storage can improve your overall returns despite reducing your SEG payments.

How Does the SEG Improve the ROI of Solar Panels?

The Smart Export Guarantee ensures you receive some value from all your solar generation, even electricity you can’t use directly. Let’s compare the economics with and without SEG participation:

According to the Energy Saving Trust, a typical 4kW solar system costs around £6,500 installed (with 0% VAT). Under average UK conditions, this system generates approximately 3,400 kWh per year.

Scenario 1: With SEG Registration (50% self-consumption)

• Direct savings: 1,700 kWh × 24.5p = £416.50
• SEG income: 1,700 kWh × 10p = £170.00
• Total annual benefit: £586.50
• Simple payback period: 11.1 years

Scenario 2: Without SEG Registration (50% self-consumption)

• Direct savings: 1,700 kWh × 24.5p = £416.50
• SEG income: £0 (exported electricity has no value)
• Total annual benefit: £416.50
• Simple payback period: 15.6 years

Registering for the SEG reduces the payback period by approximately 4.5 years in this example. Given that registration is free and straightforward, there’s no reason not to participate.

Scenario 3: With Battery Storage (80% self-consumption)

• System cost: £6,500 (solar) + £6,000 (battery) = £12,500
• Direct savings: 2,720 kWh × 24.5p = £666.40
• SEG income: 680 kWh × 10p = £68.00
• Total annual benefit: £734.40
• Simple payback period: 17.0 years

Adding a battery increases total annual benefit but extends the payback period due to higher upfront cost. However, batteries provide additional value through time-of-use tariff optimisation and backup power that isn’t captured in simple payback calculations.

How to Register for the Smart Export Guarantee

Registering for the SEG is straightforward. Here’s the process:

Step 1: Ensure Your Installation Qualifies

To be eligible for the SEG, your solar installation must:

• Be installed by an MCS-certified installer (or equivalent certification)
• Have a total installed capacity of 5MW or less (not relevant for residential systems)
• Not already receive payments under the Feed-in Tariff

Step 2: Get a Smart Meter

You need a smart meter (or advanced meter) capable of recording half-hourly export data. If you don’t have one, contact your electricity supplier to request an installation – this is free of charge. Some older SMETS1 meters may need upgrading to SMETS2 for SEG compatibility.

Step 3: Choose a SEG Supplier

Compare SEG tariffs from different suppliers using online comparison tools. Remember:

• You don’t have to use your electricity supplier for SEG
• You can switch SEG suppliers at any time
• Consider both fixed and variable rate options

Step 4: Apply to Your Chosen Supplier

You’ll need to provide:

• Your MCS certificate number (provided by your installer)
• Details of your installation (capacity, technology type)
• Your meter details (MPAN number)
• Proof that your meter can record export data

Most suppliers offer online application processes that take just a few minutes. Your installer should provide all the documentation you need.

Time-of-Use Export Tariffs: Maximising Your SEG Income

Some suppliers offer variable SEG tariffs that pay different rates depending on when you export. These “agile” or time-of-use export tariffs can significantly increase your income if you have battery storage:

• Peak export rates (typically 4-7pm) can reach 15-30p/kWh or higher during periods of high grid demand
• Off-peak rates may be lower than fixed tariffs (sometimes below 5p/kWh)
• With a battery, you can store daytime solar generation and export during peak-rate periods

Octopus Energy’s Agile Outgoing tariff is a popular example, paying rates that vary every half hour based on wholesale market prices. On days of high demand, export rates can spike significantly above standard SEG rates.

Without a battery, time-of-use export tariffs may offer limited benefit since most solar generation occurs during off-peak daytime hours. However, with battery storage, the strategy of “buy cheap, sell dear” can substantially improve returns.

Can You Make Money Selling Solar Electricity in the UK?

A common question from prospective solar owners is whether they can “flip” their energy bills – generating more than they use and profiting from exports. The short answer: it’s not a viable strategy.

Here’s why:

• SEG rates are lower than import rates. You pay around 24.5p/kWh for electricity but receive only 4-15p/kWh for exports. Every kWh you export instead of using costs you money.
• Solar generation is seasonal. UK systems produce 40-50% of annual output in summer. Winter generation is much lower, and you’ll likely need to import grid electricity during darker months.
• Oversizing rarely makes financial sense. Installing more panels than you need means paying more upfront for electricity you’ll sell at a loss compared to retail rates.

The optimal strategy is to size your solar system to match your consumption, maximise self-consumption (with a battery if cost-effective), and treat SEG income as a bonus rather than a primary income source.

Grid Flexibility Services: Earning Extra from Your Solar and Battery

Beyond the SEG, battery storage owners can participate in grid flexibility services that provide additional income. These services help balance the National Grid during periods of high demand:

• Demand Flexibility Service: The National Grid ESO occasionally calls on households to reduce consumption or export stored energy during peak demand. Participants receive payments for their contribution.
• Aggregator programmes: Companies like Octopus, Tesla, and others aggregate thousands of home batteries to provide grid services. Your battery is automatically discharged briefly during high-demand periods, earning you money.
• Typical earnings: £100-£300+ per year, depending on participation and grid needs.

These programmes are generally opt-in and don’t significantly impact your daily battery use. They represent an additional revenue stream that can improve the economics of battery storage.

Frequently Asked Questions

Do I have to register for the SEG?

No – registration is voluntary. However, without SEG registration, you’ll receive no payment for electricity you export to the grid. Since registration is free and straightforward, there’s no reason not to participate.

Can I have the SEG with a different supplier than my electricity?

Yes – you can choose any SEG licensee, regardless of who supplies your electricity. This allows you to shop around for the best export rates whilst staying with your preferred electricity supplier.

How often do SEG payments arrive?

Payment frequency varies by supplier – some pay monthly, others quarterly. Check the terms when signing up. Most suppliers pay by bank transfer or credit to your energy account.

Can I switch SEG suppliers?

Yes – you can switch at any time if you find a better rate. The process is similar to switching energy suppliers. There are usually no exit fees for SEG tariffs.

Is SEG income taxable?

For most homeowners, no. SEG income typically falls within HMRC’s £1,000 property allowance and is tax-free. Only if your annual SEG income exceeds £1,000 (unusual for residential systems) would you need to consider tax implications.

What happened to the Feed-in Tariff?

The FiT closed to new applicants in March 2019. Existing FiT recipients continue to receive their payments for the full 20-25 year term. The SEG replaced the FiT for new installations but offers lower returns since it only pays for exports, not generation.

Conclusion: Making the Most of the Smart Export Guarantee

The Smart Export Guarantee ensures UK solar panel owners receive value for electricity they export to the grid. Whilst SEG rates are lower than the old Feed-in Tariff, the combination of direct savings from self-consumption plus SEG income makes solar panels financially attractive in 2026.

Key takeaways for maximising your solar returns:

• Prioritise self-consumption – using electricity directly saves more than exporting it
• Register for the SEG – it’s free and ensures you receive value from exports
• Compare SEG tariffs regularly – rates vary significantly between suppliers
• Consider battery storage – improves self-consumption and enables time-of-use optimisation
• Explore grid flexibility services – additional income for battery owners

To ensure SEG eligibility, always use an MCS-certified installer and request a smart meter if you don’t already have one. With the right setup, you’ll benefit from every kilowatt-hour your solar panels generate.