The Smart Export Guarantee (SEG) allows eligible organisations with solar panels to receive payments for surplus electricity exported to the grid. How much a site can earn depends on how much electricity it exports, the tariff offered by the electricity supplier, and how much solar generation is used on-site rather than exported.
The important thing to understand is that SEG payments are usually not the main source of value from a commercial solar installation.
For most commercial sites, the strongest financial benefit comes from using solar electricity on-site and reducing the amount of electricity purchased from the grid.
SEG income is normally an additional benefit rather than the primary reason organisations invest in solar.
Key Takeaways
- The Smart Export Guarantee (SEG) pays eligible generators for surplus electricity exported to the grid.
- Commercial sites must meet certain eligibility requirements, including appropriate certification and export metering.
- SEG earnings depend on export volumes and tariff rates rather than system size alone.
- For most commercial organisations, using solar electricity on-site is often more valuable than exporting it.
- Battery storage can influence how much electricity is exported and how much SEG income is received.
What Is the Smart Export Guarantee?
The Smart Export Guarantee is a government-backed scheme that requires larger electricity suppliers to offer export tariffs to eligible renewable energy generators.
If a solar system generates more electricity than a site is using at a particular moment, that surplus electricity can be exported to the grid.
Under the SEG, electricity suppliers pay for that exported electricity.
The scheme replaced the export element of the Feed-in Tariff and has been available since January 2020.
Electricity suppliers with 150,000 or more domestic electricity customers are required to offer at least one Smart Export Guarantee tariff.
The result is a market where eligible solar owners can choose from a range of export tariffs rather than relying on a single national rate.
How Does SEG Work for Commercial Solar?
The process is relatively straightforward.
Solar panels generate electricity on-site.
The building uses as much of that electricity as possible.
If generation exceeds demand, surplus electricity may be exported to the grid.
The electricity supplier then pays for the exported electricity based on the agreed tariff.
The amount earned depends on:
- how much electricity is exported
- the export tariff selected
- how much solar electricity is consumed on-site
- operational energy demand throughout the day
This means two sites with identical solar systems can generate very different levels of SEG income.
Which Commercial Sites Are Eligible for SEG?
Commercial eligibility requirements can vary slightly between suppliers, but most sites will typically require:
- an MCS-certified solar installation
- appropriate export metering
- compliance with supplier requirements
- evidence of system ownership and certification
More than 1.7 million certified renewable energy installations have been registered through the MCS scheme across the UK.
For many organisations, MCS certification forms an important part of the eligibility process for export payments.
How Much Can a Business Earn From SEG?
There is no fixed answer because earnings depend on the amount of electricity exported.
Some commercial sites export relatively little because most of their solar generation is used immediately on-site.
Others may export more because electricity demand is lower during solar generation hours.
Factors that influence SEG earnings include:
- system size
- electricity consumption patterns
- operating hours
- export tariff rates
- seasonal generation
- battery storage
This is one reason we generally view SEG as part of the overall solar business case rather than the main financial driver.
The strongest commercial solar projects are usually designed to reduce imported electricity first and maximise export revenue second.
How Commercial Solar Typically Creates Value
| Source of Value | How It Works |
| Reduced electricity purchases | Solar electricity is used on-site instead of buying electricity from the grid |
| Smart Export Guarantee payments | Surplus electricity is exported and paid for by an SEG supplier |
| Lower exposure to future electricity price increases | More electricity is generated on-site |
| Battery storage optimisation | More solar electricity may be retained for later use |
For most commercial organisations, avoided electricity purchases usually create the largest financial benefit.
Is Exporting Electricity the Best Way to Make Money From Solar?
Usually not. One of the most common assumptions is that exporting electricity generates the biggest financial return from solar.
In practice, most commercial sites achieve stronger returns by using solar electricity on-site rather than exporting it.
That is because the value of avoided electricity purchases is often higher than the value of exported electricity.
Export payments can still add value, but they are usually treated as an additional benefit rather than the primary driver of a commercial solar project.
This is one of the practical distinctions we often discuss with clients.
A solar system that closely matches daytime electricity demand will often produce a stronger financial outcome than a system that relies heavily on export revenue.
What Affects How Much Electricity a Site Exports?
Every commercial site uses electricity differently.
Two organisations with identical solar systems may export very different amounts of electricity.
Export levels are often influenced by:
- daytime electricity demand
- occupancy patterns
- operational hours
- equipment loads
- seasonal usage
- battery storage
A manufacturing facility operating throughout the day may use most of the electricity it generates.
An office building with lower occupancy at certain times may export more electricity.
Understanding how a site consumes electricity is often just as important as understanding how much electricity the solar system can generate.
Can Battery Storage Affect SEG Earnings?
Yes. Battery storage changes how solar electricity is used across a site.
Without a battery, surplus electricity is often exported immediately.
With battery storage, some of that electricity can be stored and used later.
This may reduce the amount of electricity exported and therefore reduce SEG payments.
However, many commercial organisations find that using stored solar electricity later delivers greater overall value than exporting it.
The answer depends on:
- export tariffs
- electricity purchase costs
- site demand patterns
- battery performance
That is why battery storage should normally be assessed as part of the wider energy strategy rather than viewed only through the lens of SEG earnings.
How Much Is Being Paid Through the SEG Scheme?
The Smart Export Guarantee has become an increasingly important route for renewable energy generators to receive payment for exported electricity.
Ofgem reported that more than £56.97 million was paid to SEG generators during the 2024–25 reporting year.
This demonstrates that export payments are now an established part of the UK’s renewable energy market.
For individual organisations, however, the focus should remain on how solar supports the site’s overall energy strategy rather than export income alone.
SEG as Part of a Commercial Solar Business Case
The Smart Export Guarantee can provide an additional revenue stream for commercial solar installations, but it is rarely the main reason organisations invest in solar.
The strongest commercial solar projects are usually built around:
- reducing imported electricity
- improving energy cost predictability
- increasing on-site generation
- supporting long-term operational goals
At Synergy PV Renewables, the focus is always on understanding how a site uses electricity before discussing export revenue.
A commercial solar system should first be designed around how the organisation operates.
Export payments may then provide an additional benefit where surplus electricity is available.
A proper assessment can help clarify:
- how much electricity a system could generate
- how much may be used on-site
- how much may be exported
- whether battery storage could improve overall performance
If you’re exploring commercial solar and want to understand how SEG fits into the financial picture, we’re happy to have a straightforward conversation about what may work for your site.
FAQs
What is the Smart Export Guarantee?
The Smart Export Guarantee is a scheme that pays eligible renewable energy generators for electricity exported to the grid.
Can commercial solar systems qualify for SEG?
Yes, provided the installation and metering arrangements meet supplier eligibility requirements.
How much can a business earn from SEG?
That depends on export volumes, tariff rates, and how much electricity is used on-site rather than exported.
Is exporting electricity more valuable than using it on-site?
Often not. For many commercial sites, avoided electricity purchases are worth more than export payments.
Can battery storage affect SEG income?
Yes. Battery storage may reduce export volumes because more solar electricity can be stored and used later on-site.
