Can ECO4 Solar Panels Earn Smart Export Guarantee Payments?

ECO4 Solar vs Smart Export Guarantee

What is the Smart Export Guarantee?

The Smart Export Guarantee is a government-backed scheme introduced in January 2020. It requires participating electricity suppliers, known as SEG licensees, to pay eligible small-scale generators for renewable electricity exported to the grid. Solar PV is one of the technologies covered by the scheme.

The important distinction is that SEG does not pay you for all the electricity your solar panels generate.

Instead, it relates to electricity that is exported rather than used within your property.

For example, if your solar panels generate electricity during the day and your home uses some of it, the remaining eligible electricity may be exported to the grid. A SEG supplier can pay you for that exported electricity.

Can ECO4 solar panels qualify?

Potentially, yes.

Ofgem’s current ECO4 Delivery Guidance specifically recognises solar PV as an ECO4 measure and sets technical requirements for its delivery. The current guidance also states that each home has a 10 kWp Solar PV generation capacity cap, including any pre-existing solar PV.

ECO4 therefore does not mean that the electricity generated by the system becomes ineligible for export payments.

Instead, there are two separate considerations:

1. Does the solar installation qualify under ECO4?
2. Does the completed installation satisfy SEG eligibility requirements?

Meeting one does not automatically mean the other is satisfied.

How ECO4 and SEG Work Together

Think of the schemes as operating at different stages.

ECO4 concerns the installation and its contribution towards an energy supplier’s energy-efficiency obligations.

SEG concerns what happens to eligible electricity after your renewable generator is operating.

This distinction is particularly important because homeowners sometimes assume that an ECO-funded solar installation cannot receive any additional financial benefit.

That is not necessarily the case.

Ofgem’s ECO4 guidance confirms that solar PV can be an eligible ECO4 measure, subject to the scheme’s requirements. Ofgem separately states that solar PV installations can qualify for SEG where the relevant eligibility criteria are met.

Does ECO4 pay for the electricity you export?

No.

ECO4 does not pay you for exported electricity. SEG is the mechanism through which eligible exported electricity can generate payments from a participating electricity supplier.

Your SEG contract is separate from the ECO4 support arrangement.

What Determines Your SEG Payments?

SEG suppliers set their own tariffs and contractual terms. Ofgem states that SEG tariff rates must be above zero and recommends that generators compare available tariffs.

Your potential income therefore depends on factors such as:

• How much electricity your solar system generates
• How much electricity your household consumes directly
• How much electricity is exported
• The SEG tariff you receive
• Your electricity consumption patterns
• Whether you have battery storage
• Your solar PV system size
• Seasonal generation levels

A household that uses a large proportion of its solar electricity during daylight hours may export less electricity than a household with low daytime consumption.

That does not necessarily mean its solar system is performing worse. Using your own solar electricity can reduce the amount of electricity you need to buy from the grid.

Does an ECO4 Solar System Need a Battery for SEG?

No. A battery is not generally required simply to participate in SEG.

Ofgem’s ECO4 guidance states that battery storage can be installed during an ECO4 retrofit, but it does not count as a new ECO4 measure or contribute to ECO scoring because it does not improve the property’s SAP rating.

A battery can nevertheless affect how electricity is used.

For example, excess solar generation could potentially be stored for later use rather than immediately exported. Whether that improves your overall financial position depends on your household’s consumption, battery system, electricity tariff and export tariff.

A battery should therefore be assessed as part of the whole energy system, rather than automatically being considered necessary for SEG.

SEG Eligibility Requirements

Having ECO4 solar panels is not, by itself, the complete SEG eligibility test.

Ofgem states that SEG-eligible installations include solar PV, wind, micro-CHP, hydro and anaerobic digestion. Solar PV installations can be up to 5MW, although domestic systems are normally far smaller.

You should also expect the SEG application process to require evidence relating to your installation.

This is one reason it is important to keep:

• Installation documentation
• Equipment details
• Relevant certification
• Meter information
• Commissioning documentation
• Evidence of ownership
• Any documents supplied by your installer

Your installer should be able to explain what documentation you will receive when the system is commissioned.

How to Apply for SEG

You do not have to use the same company for SEG as your electricity supplier.

Ofgem confirms that generators can choose a SEG licensee independently and can use separate companies for their electricity supply and SEG payments.

A sensible process is:

1. Confirm your installation details

Establish exactly what solar PV system has been installed, including its capacity and relevant certification.

2. Check SEG suppliers

Compare available SEG tariffs rather than automatically choosing your existing electricity supplier.

Ofgem publishes a current list of SEG licensees. For the SEG year beginning 1 April 2026, the list includes suppliers such as British Gas, E.ON Next, EDF, Octopus, OVO and ScottishPower, alongside voluntary licensees.

3. Apply to your chosen supplier

The supplier will explain the documentation and meter requirements for its tariff.

4. Submit the required evidence

Your application may require information about your generation system and installation.

5. Start receiving payments

Once accepted, eligible exported electricity can be measured and payments made according to the supplier’s SEG tariff and terms.

Is SEG Worth It With ECO4 Solar?

For many homeowners, yes, it can be worth applying if the installation is eligible.

However, SEG should not be viewed as the only financial benefit of solar PV.

Solar panels can potentially provide value in two main ways:

1. Reduced electricity purchases

You can use electricity generated by your panels instead of purchasing as much electricity from your supplier.

2. Export payments

Electricity that is exported to the grid may generate SEG payments if you meet the relevant requirements and have a SEG contract.

The balance between these two benefits depends heavily on how your household uses electricity.

For example, a family that is home during the day may consume a significant amount of solar generation directly. A household where everyone leaves for work and school during daylight hours may export more electricity.

Why Your Installer Matters

Solar performance depends on considerably more than the panel’s headline wattage.

Installation quality can influence:

• System performance
• Safety
• Reliability
• Monitoring
• Electrical compliance
• Long-term maintenance
• Documentation
• Warranty support

This is particularly important where you intend to use the system for many years and potentially receive export payments.

ECO4 itself operates within a formal delivery framework. Ofgem states that ECO4 installers must generally be TrustMark registered to deliver ECO measures, while projects involving relevant retrofit measures follow the applicable retrofit requirements.

Always ask an installer exactly what certification and documentation you will receive after installation.