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Do You Get Paid for Balcony Solar Export? The £0 Problem
Almost always, no. Electricity your balcony solar system sends to the grid earns you nothing. It is not lost, wasted or unused — your neighbours consume it and your supplier sells it to them — but no payment reaches you.
There is now one exception. If you buy Octopus Energy's own plug-in solar kit and Octopus supplies your electricity, Octopus gives you access to its Outgoing Prime export tariff. Every other combination still earns £0 (checked 26 September 2026).
This page is about what actually happens to those units and what they are worth. For the mechanics of why plug-in solar fails Smart Export Guarantee eligibility, see How to Read Your Smart Meter After Installing Balcony Solar. For how SEG sits alongside other schemes, see Solar Panel Grants UK.
For almost every kit, export is worth £0, so savings come from using what you generate. The payback & ROI calculator lets you set self-consumption and see the real return.
Quick Facts - Do balcony solar exports earn money? Almost never — plug-in kits are not MCS-certified, so SEG tariffs do not accept them. The one exception is Octopus's own kit on Octopus supply - Where do the exported units go? Onto the local network, consumed by nearby properties within milliseconds - Does your supplier pay for them? No, unless you bought Octopus's kit and Octopus supplies you — and on most meters they are recorded but not billed either way - How much is typically given away? Roughly 10–40% of annual generation, worth about £8–£30 a year - Is that worth solving? Usually not with hardware — a battery costs far more than the export it rescues - Has anything changed? Yes, for one kit. Octopus, the first supplier on the ENA register (8 September 2026), now offers Outgoing Prime to customers who bought its plug-in kit
What actually happens to an exported unit
When your inverter produces more than the property is consuming, the surplus does not stop at your consumer unit. It flows backwards through your meter onto the local low-voltage network and is consumed almost instantly by whatever is drawing power nearby — a neighbour's kettle, the lift in your block, a shared corridor light.
Three things follow from this, and they are the part most guides skip:
- The electricity is not wasted. It displaces generation elsewhere on the grid. The carbon benefit is real and is unaffected by whether you are paid.
- Your supplier is not stealing it. There is no mechanism by which a supplier receives your exported units and pockets them. They enter the network and are billed to whoever consumed them, by their supplier.
- Nobody owes you anything for it, because you have no export agreement. Payment under the Smart Export Guarantee requires a registered, MCS-certified installation. A plug-in kit is not one, so there is no contract for the units to be paid under.
The honest framing is not "you are being cheated" but "you gave it away." That distinction matters when deciding whether to spend money fixing it.
How much are you actually giving away?
This is the number that decides whether the problem is worth solving, and it is much smaller than most people assume.
A typical 800W balcony system in the UK generates roughly 550–750 kWh a year. How much is exported depends entirely on whether anyone is home during generating hours:
| Household pattern | Self-consumption | Exported | Units given away/year |
|---|---|---|---|
| Someone home all day | 85–90% | 10–15% | ~70–100 kWh |
| Home part of the day / WFH hybrid | 70–80% | 20–30% | ~140–200 kWh |
| Out 9–5 every weekday | 60–70% | 30–40% | ~210–280 kWh |
Now the key step, and the one that reframes the whole question. Those units are not worth the price you pay for electricity. They are worth what an export tariff would have paid for them, which is far less.
At a representative open-to-all export rate of 12p/kWh, an out-all-day household giving away ~250 kWh a year is forgoing about £30/year. A household that is usually home gives away nearer £10/year.
Compare that with the value of the units you do self-consume, each of which saves you the full import price of 26.32p/kWh. Self-consumption is worth more than twice as much per unit as export would be. This is why every serious balcony solar guide tells you to shift your washing machine to the afternoon rather than to buy something.
Should you buy a battery to capture it?
Usually not, if export capture is the only reason.
A battery lets you store the surplus and use it in the evening, converting a unit worth 0p into a unit worth 26.32p. For the out-all-day household above, that is roughly 250 kWh × 26.32p ≈ £66/year of recovered value, and only if the battery is sized well and cycles nearly every day.
Against that, entry-level plug-in battery storage runs £600–£1,200. Payback on the export-capture benefit alone is therefore around 10–18 years, which is at or beyond the hardware's useful life. Batteries can still be worth buying — for outage resilience, for tariff arbitrage on a time-of-use import tariff, or simply because you want one — but "to stop wasting my export" is on its own a poor financial case.
Free measures come first, and they are genuinely effective: running dishwashers, washing machines and tumble dryers during daylight, timing EV or e-bike charging to the middle of the day, and pre-heating hot water while the sun is up. For a fuller treatment see Do You Need Battery Storage for Balcony Solar?.
What would have to change for you to be paid
Three routes exist in principle, in ascending order of likelihood:
1. MCS certification for plug-in kits. The most direct fix and the least likely. MCS is built around professional installation by a registered contractor, which is precisely what plug-in solar is designed to avoid. Extending it to self-installed kits would require rethinking the scheme's foundations.
2. A simplified export route tied to the ENA register. Since 27 August 2026 a compliant plug-in kit must appear on the ENA G98 Type Test Register, and registration happens through myplugin.solar. That creates something that did not exist before: a national, verifiable record of exactly which plug-in systems are installed and where. That record is the main thing a simplified export scheme would need, and it now exists. See the Certified Plug-In Solar Kits Tracker.
3. A supplier deciding to pay anyway. SEG sets a floor, not a ceiling. Nothing stops a supplier offering a voluntary export payment to plug-in customers on commercial terms — and this is the route that just became live.
The Octopus development, and why it matters
On 8 September 2026, Octopus Energy became the first energy supplier to list a compliant device on the ENA register (the M1-800-E). Every prior entry came from a hardware manufacturer.
The structural significance is that a supplier occupies both sides of the transaction. It sells you the kit, and it buys electricity from you. A supplier that certifies its own plug-in device knows exactly what is installed, that it is compliant, and that it is registered — which is most of the due diligence an export arrangement requires. It could offer a voluntary export payment to those customers without waiting for MCS reform or a government scheme.
It has now happened, for Octopus's own kit. Octopus's plug-in solar page (checked 26 September 2026) sets out three cases:
- You bought the kit from Octopus and Octopus supplies your electricity: you get access to Outgoing Prime, its top-tier export tariff. You need a working smart meter.
- You bought the kit from Octopus but another company supplies you: you have to arrange export with your own supplier, and most will pay nothing without MCS.
- You bought your kit anywhere else: you cannot join an Octopus export tariff for it.
You also cannot sign up on day one. The system must first be registered through the ENA portal and approved by your network operator. Octopus has not published an Outgoing Prime rate on its plug-in pages. As a guide, a two-panel kit exporting a quarter of its output sends about 215 kWh a year to the grid, so each 1p/kWh of export rate is worth about £2 a year. Octopus plug-in solar: prices, certification and export →
What to do about it today
- Assume £0 for export in any payback calculation unless you have bought Octopus's kit and are on Octopus supply. If a retailer's savings figure only works with export income included, it is wrong for every other plug-in kit. Our savings calculator assumes self-consumption only.
- Optimise self-consumption instead. Every unit you use is worth 26.32p; for almost every kit, every unit you export is worth 0p. Shifting a single daytime appliance cycle beats any export scheme currently available to you.
- Size the system to your daytime load, not to your roof space or your total annual usage. An oversized balcony array exports more and therefore wastes more.
- Don't buy a battery for export capture alone — buy one for resilience or tariff arbitrage, with export capture as a bonus.
Q: Does balcony solar qualify for the Smart Export Guarantee? A: No. SEG tariffs require MCS-certified installation, which plug-in solar does not have. The one exception we know of is voluntary: Octopus offers its Outgoing Prime export tariff to customers who bought Octopus's own plug-in kit and are on Octopus supply.
Q: Is my energy supplier profiting from my exported solar? A: Not in the way people usually mean. Exported units are consumed by nearby properties and billed to those customers by their own suppliers. Your supplier does not receive and resell your specific units — but you are not paid for them either.
Q: How much money am I losing to unpaid export? A: Typically £8–£30 a year for an 800W system, based on 10–40% of generation being exported and a representative 12p/kWh export rate. It is a real loss but a small one, which is why hardware solutions rarely pay back.
Q: Will a smart meter pay me for balcony solar export automatically? A: No. A SMETS2 meter can measure export, but measurement is not payment — payment requires registration on an export tariff, which normally needs MCS certification (Octopus's own plug-in kit is the exception). See How to Read Your Smart Meter After Installing Balcony Solar.
Q: Does Octopus pay for plug-in solar export? A: Yes, but only for its own kit. If you bought Octopus's plug-in solar bundle and Octopus supplies your electricity, you can join Outgoing Prime once your network operator has approved the registration. Kits bought elsewhere are not eligible for an Octopus export tariff.