Smart Export Guarantee UK 2026: Complete Guide

What is the Smart Export Guarantee?

The Smart Export Guarantee (SEG) is a UK government scheme launched in January 2020 that requires medium and large energy suppliers to pay homeowners for excess solar electricity exported to the grid.

When your solar panels generate more electricity than you're using, the surplus automatically flows back to the national grid. Before SEG, you often got nothing for this. Now, energy suppliers must pay you for every unit (kWh) you export.

Key points about SEG:

• Mandatory for large suppliers: All suppliers with 150,000+ customers must offer at least one SEG tariff
• Payment rates vary: Suppliers set their own rates (4p–12p/kWh for standard fixed tariffs in 2026)
• No contract lock-in: You can switch SEG suppliers anytime to get better rates
• Separate from import: Your SEG supplier doesn't have to be your electricity supplier
• Ongoing income: Payments continue for the lifetime of your system (25+ years)

Best SEG Rates UK 2026

SEG rates vary significantly between suppliers. Here are the top-paying tariffs in 2026:

Important: You do NOT need to be an Octopus customer to get their 12p/kWh Outgoing Octopus rate. You can import electricity from British Gas and export to Octopus. SEG and import are completely separate.

How Much Can You Earn from SEG?

Your SEG income depends on three factors:

1. System Size & Generation

• 3kW system: Generates ~2,500 kWh/year → Exports 750–1,000 kWh → £90–120/year at 12p
• 4kW system: Generates ~3,400 kWh/year → Exports 1,000–1,500 kWh → £120–180/year at 12p
• 6kW system: Generates ~5,100 kWh/year → Exports 1,500–2,000 kWh → £180–240/year at 12p

2. Self-Consumption Rate

Most UK homes self-consume 60–70% of solar generation (use it immediately in the home). The remaining 30–40% gets exported and earns SEG income.

Factors affecting exports:

• Home during the day: Lower exports (more self-consumption)
• Away at work: Higher exports (less self-consumption)
• Electric heating/cooking: Higher self-consumption
• Battery storage: Stores excess, reduces exports significantly

3. SEG Tariff Rate

The difference between Octopus (12p) and Shell (4p) is £120/year on a 4kW system exporting 1,500 kWh. Over 25 years, that's £4,500 vs £1,500 – a £3,000 difference just from choosing the right tariff.

How to Register for Smart Export Guarantee

Step 1: Get Your MCS Certificate

Your solar installer provides this after installation. It's proof your system meets UK standards. Without MCS certification, you cannot claim SEG payments.

Step 2: Install Smart Meter

You need a SMETS2 smart meter that can measure half-hourly exports. If you don't have one, your SEG supplier arranges free installation once you sign up.

Step 3: Choose SEG Supplier

Compare rates from the table above. Octopus Energy's 12p/kWh is currently among the best fixed rates available. You can switch anytime if better rates appear.

Step 4: Apply

Contact your chosen SEG supplier (online application usually). You'll need:

• MCS certificate number
• System size (kW)
• Installation date
• Current meter details
• Bank details for payments

Step 5: Start Earning

Once approved (2–4 weeks), your smart meter automatically records exports. Payments arrive quarterly or monthly, depending on supplier.

SEG Requirements & Eligibility

To qualify for Smart Export Guarantee:

• MCS certification required: Your system must be installed by an MCS-certified installer
• System size limit: Must be 5MW or less (domestic systems are typically 3–6kW, so easily qualify)
• Smart meter needed: Half-hourly export meter (SMETS2)
• Installation date: System installed after 1 January 2020, OR installed before but not on old Feed-in Tariff
• Grid connection: System must be grid-tied (not off-grid)

Can I get SEG if I had Feed-in Tariff? No. If you were on the old FIT scheme (ended March 2019), you cannot switch to SEG. FIT payments are much higher anyway (typically 10–15p/kWh generation + 5p/kWh export).

Maximizing Your SEG Income

1. Choose Highest-Paying Tariff

Octopus Energy's 12p/kWh (cut from 15p in March 2026) still beats most standard tariffs by 6–8p/kWh. That's £90–120/year extra on a 4kW system. Check rates annually – suppliers compete and rates change.

2. Time High-Energy Tasks for Solar Hours

Running washing machine, dishwasher, or charging EV during solar peak hours (10am–4pm) increases self-consumption, reducing reliance on grid. However, this reduces exports and SEG income.

Trade-off: Self-consumed electricity saves 24.50p/kWh (Ofgem rate), while exports earn 12p/kWh. Self-consumption is worth roughly twice as much as exports — prioritise self-consumption first.

3. Battery Storage Impact

Batteries store excess solar instead of exporting it. This dramatically reduces SEG income (often to £20–40/year) but increases self-consumption savings significantly.

Financial logic: A battery costs £5,000–6,000 and reduces SEG by ~£100/year. But it increases self-consumption by 30–40%, saving £400–600/year on electricity bills. Net benefit: £300–500/year.

4. Annual SEG Tariff Review

SEG rates change. Set a calendar reminder each January to check if a better tariff exists. Switching takes 10 minutes and could earn you £50–100/year extra.

SEG vs Feed-in Tariff: What Changed?

The old Feed-in Tariff (FIT) scheme closed to new applicants in March 2019. SEG replaced it in January 2020, but they work very differently:

Bottom line: FIT was significantly better, paying for both generation AND exports. SEG only pays for exports. However, solar panels are now 70% cheaper than when FIT existed, so overall ROI is still excellent.

Final Thoughts

The Smart Export Guarantee adds £150–300/year to your solar savings on a typical 4kW system. While it's not as generous as the old Feed-in Tariff, it still provides meaningful ongoing income for 25+ years.

Choose Octopus Energy's 12p/kWh tariff for a reliable fixed rate, and remember you can switch SEG suppliers anytime without affecting your electricity import supplier. Review rates annually to ensure you're getting the best deal.

Combined with electricity bill savings, solar panels in the UK typically deliver 6–9 year payback periods and 300–400% ROI over their lifetime.