Smart Export Guarantee Explained: Getting Paid for Your Solar Energy

One of the biggest misconceptions about solar panels is that you're only saving money by reducing grid electricity consumption. That's true—but you're leaving money on the table if you're not exporting surplus energy back to the grid.

Enter the Smart Export Guarantee (SEG). This UK government scheme lets homeowners and small businesses earn cash for excess solar electricity they export. Depending on your system size, battery storage, and supplier, you could earn £50-£300 per year. With a solar carport and battery storage, that number rises significantly.

Let's break down what SEG is, how it works, current tariff rates, and how to maximise your export income.

What Is the Smart Export Guarantee?

The Smart Export Guarantee is a government-backed scheme (launched January 2020) that requires energy suppliers to pay homeowners for excess electricity their solar panels export to the grid. It replaced the old Feed-in Tariff, which closed to new applicants in March 2019.

In simple terms: if your solar panels generate 10kWh of electricity in a day and you only use 6kWh, the remaining 4kWh is exported to the grid. SEG suppliers pay you for those 4kWh.

Participation in SEG is optional—you're not required to export electricity. But if you have solar panels and don't take advantage of SEG, you're essentially giving away free electricity.

Who Can Sign Up to SEG?

You're eligible for SEG if you have:

• A domestic or small business solar panel system (up to 50kW for homes, 100kW for businesses)
• Renewable energy generators (wind turbines, hydro, biomass also qualify)
• Battery storage systems paired with renewables
• An MCS (Microgeneration Certification Scheme) certified installation

If your installation was completed by an MCS-certified installer—like Oak Frame Solar—you're automatically eligible.

You don't need to be on any particular energy tariff or with any particular supplier. SEG is available across all major UK energy suppliers, including Octopus, British Gas, EDF, E.ON, Bulb, and many others.

How Does SEG Work?

SEG operates on a simple principle:

1. Your solar panels generate electricity. This happens during daylight hours, with peak generation between 10am and 3pm.
2. You use what you need. Any electricity used in your home comes directly from your panels (no payment, no export).
3. Excess goes to the grid. Any generation above your real-time consumption is exported to the grid.
4. You get paid. Your supplier tracks exports (via a smart meter) and pays you a fixed tariff rate.

Payment is typically made monthly, quarterly, or annually, depending on your supplier's arrangement. Most suppliers offer a lump sum annually or credits against your electricity bill.

SEG Tariff Rates: What Can You Earn in 2026?

SEG rates vary by supplier and change regularly. Here's what typical rates look like in March 2026:

As you can see, rates vary between 11p and 15p per kWh. Octopus Energy and specialist solar tariffs typically offer the most competitive rates. Before signing up, compare rates across suppliers—your SEG supplier doesn't need to be the same as your main energy supplier.

How Much Can You Earn? Real Numbers

Your SEG earnings depend on three factors: system size, location, and export percentage (how much excess energy you have).

Scenario 1: 4kW Solar Carport (No Battery)

A 2-bay oak frame solar carport with 4kW solar and no battery storage in South England:

• Annual generation: ~3,800 kWh
• Home consumption: ~2,400 kWh
• Annual export: ~1,400 kWh (37% of generation)
• At 15p/kWh: £210 per year

Scenario 2: 6kW Solar Carport + 10kWh Battery

A 3-bay oak frame solar carport with 6kW solar and 10kWh battery storage:

• Annual generation: ~5,700 kWh
• Home consumption: ~2,400 kWh
• Battery charging: ~2,300 kWh
• Annual export: ~1,000 kWh (17% of generation)
• At 15p/kWh: £150 per year

Wait—doesn't battery storage reduce SEG earnings? Yes, but that's intentional and actually a better financial outcome. Here's why:

• Without battery: You export excess at 15p/kWh
• With battery: You store excess during the day, use it in the evening at full value (no export payment needed because you're not exporting)

You earn less from SEG, but you save more on electricity bills because you're using battery-stored solar at night instead of buying grid electricity (which costs 25p-35p/kWh on typical tariffs).

Scenario 3: 8kW Solar Carport + 15kWh Battery + Smart EV Charging

A 4-bay oak frame solar carport with premium energy systems:

• Annual generation: ~7,600 kWh
• Home consumption: ~2,400 kWh
• EV charging from solar: ~4,000 kWh
• Battery charging: ~800 kWh
• Annual export: ~400 kWh (5% of generation)
• At 15p/kWh: £60 per year

Very little export, but significant savings across the board: electricity bill savings from home consumption + battery use, EV charging savings of £800+ per year, and minimal grid dependency.

Maximising Export Income: Battery Storage is Key

To earn the most from SEG, you might think "bigger system = bigger exports." But that's not how it works in practice. Most UK homes use electricity steadily throughout the day. A large solar system generates excess during midday, which you can't instantly use.

Battery storage changes the equation. Instead of exporting excess midday generation at 15p/kWh, you store it and use it in the evening at full value (avoiding the 25p-35p cost of grid electricity).

For maximised SEG earnings specifically, you'd actually want a smaller system with less battery—but that sacrifices overall financial benefit. The optimal strategy is to balance:

• System size: Large enough to cover most of your annual consumption
• Battery capacity: Sized to capture excess generation and provide evening power
• Export acceptance: Accept that some export is healthy (keeps your system sized realistically)

With this approach, you get the best of both worlds: massive electricity bill savings, energy independence, and consistent SEG export income.

How to Sign Up to SEG

The process is straightforward:

1. Check your installation is MCS certified. Oak Frame Solar installations come with full MCS certification, so you're covered here.
2. Get a smart meter installed. Your supplier needs to measure your exports. Most customers already have a smart meter; if not, request one (it's free).
3. Choose your SEG supplier. This can be your existing energy supplier or a different one. Compare rates on Ofgem's SEG providers list.
4. Register your system. Contact your chosen supplier, provide your MCS certificate number and installation details, and sign the SEG contract.
5. Start receiving payments. Once registered, your meter will track exports and you'll receive payment monthly, quarterly, or annually.

The entire process takes 1-2 weeks. Most suppliers handle it entirely online or by phone.

Important: Changing Suppliers

You can change your SEG supplier at any time—your SEG contract is separate from your main energy supply contract. If Octopus is offering 15p/kWh and your current supplier is stuck at 11p/kWh, switch SEG suppliers. It's a quick process and takes effect within 1-2 weeks.

Many customers switch SEG suppliers annually to capture the best rates.

Tax Implications

One final point: SEG payments are technically taxable income. However, for most residential solar owners, payments are small enough to fall below the tax-free trading allowance (£1,000 per year for most people). Unless your annual SEG income exceeds £1,000, you won't need to pay tax on it.

If you do exceed £1,000 (which requires a very large system or excellent export rate), you should declare it to HMRC and may be able to offset system costs as business expenses.

Maximise Your Solar Income: Add an Oak Frame Solar System

SEG is just one part of the financial benefit from solar. Combined with electricity bill savings, potential government grants, EV charging savings, and the property value uplift from a premium oak frame structure, a solar carport pays for itself comprehensively.