Selling Electricity Back to the Grid: How It Actually Works
Any UK home with certified solar can sell its surplus electricity, and the machinery behind it is the Smart Export Guarantee: larger energy suppliers are required to offer export tariffs, your smart meter records every half-hour of export, and the money arrives as credit on your bill or cash to your bank. The unlock is paperwork, an MCS certificate, an export MPAN and a working smart meter, all of which a competent installer sorts as part of the job. No selling, no negotiation, no meter readings by torchlight: once set up, it simply pays.
In This Guide
The system behind it: the Smart Export Guarantee
Since 2020, the Smart Export Guarantee has been the framework for paying households for exported electricity. It obliges larger suppliers to offer at least one export tariff, and it leaves the rates to the market, which is why they range from token to genuinely competitive and why shopping around matters. Your exported units are measured half-hourly by your smart meter, so payment reflects what you actually sent out, not an estimate.
Two boundaries worth knowing. This article covers the mechanics, how you get connected and paid; the going rates themselves live in our SEG rates comparison, and the market-wide tariff shoot-out in our export tariff comparison. And if your system dates from the Feed-in Tariff era, you are on the older, closed scheme with different rules, leave it alone, it is valuable.
The three things that unlock payment
1. An MCS certificate
Proof the system was installed to the industry standard, issued at commissioning by a certified installer. Export tariffs require it, which is one hard-cash reason certification matters; our MCS guide covers the rest.
2. An export MPAN
Your import supply has a meter point number; exporting gets its own. Registering it with the network operator is routine paperwork your installer should handle, as we do.
3. A working smart meter
SEG payment is metered half-hourly, so a SMETS2 meter (or qualifying SMETS1) sending readings is non-negotiable. Our smart meter guide covers getting one fitted.
How the money actually arrives
Once your application to an export tariff is accepted, payments run on the supplier's cycle, commonly monthly or quarterly, and arrive either as credit against your import bill or as payment to your bank, depending on the supplier and your preference. The rhythm across a year is seasonal and worth expecting: summer months generate export statements that feel genuinely satisfying, winter ones are slim, and the annual total is what matters for the payback arithmetic in our worth-it guide. For a typical household, exports are the smaller partner to bill savings, using your own generation always beats selling it at export rates and buying it back at import rates, but they are far from trivial, and battery-equipped homes on time-of-use tariffs can push the export side hard.
Mixing suppliers and maximising it
- You can export to a different supplier than you import fromMost standalone SEG tariffs accept outside customers. The catch: the best export rates are usually reserved for that supplier's own import customers, the "bundled" deals, so the strongest setups tend to keep both sides together.
- Shop it annuallyRates move constantly. The tariff that won when your system was commissioned may be mid-table two years on; ten minutes with the comparison once a year keeps the export side honest.
- Time-of-use export pays peak premiumsTariffs like Flux pay most for early-evening exports, which is a battery's favourite trick.
How a battery changes the game
Without a battery, you export whenever the sun outruns the house, at whatever moment that happens to be. With one, exporting becomes a decision: the battery soaks up the midday surplus, covers your own evening first, and on time-of-use tariffs sells the genuine excess into the best-paid window rather than the sunniest one. Add cheap overnight charging on a two-rate tariff, the mechanics in our time-shifting guide, and the battery earns on both sides of the meter. It is the difference between selling your surplus and managing it.
Set up to sell from day one
Every Spectrum install leaves with its MCS certificate, export MPAN registered and smart meter guidance sorted, so export payments start without a paper chase. One all-in price from £8,500. Call 0115 773 7575, 8am to 8pm, Monday to Friday.
Book a feasibility assessmentFrequently asked questions
Can I sell electricity back to the grid in the UK?
Yes. Under the Smart Export Guarantee, larger suppliers must offer export tariffs, and any home with MCS-certified solar, an export MPAN and a working smart meter can sign up. Your surplus is metered half-hourly and paid as bill credit or bank payment.
How do I get paid for my solar exports?
Apply to an export tariff with your MCS certificate and meter details; once accepted, the supplier pays on its cycle, commonly monthly or quarterly, as credit against your bill or cash to your account. The application is a form, not a negotiation, and takes minutes once the paperwork exists.
Do I need a smart meter to sell electricity?
In practice yes: SEG payments are based on metered half-hourly export, which needs a SMETS2 smart meter or a qualifying SMETS1 sending readings. If you do not have one, your supplier fits it free; sorting it before commissioning means export earnings start immediately.
Is it better to export electricity or use it myself?
Use it yourself, almost always: a kilowatt-hour you consume saves the full import rate, while an exported one earns the lower export rate. That gap is the core argument for battery storage, which shifts your surplus into your own evening first and exports only the genuine excess, ideally into peak-paying windows.
Can I export to a different supplier than I buy from?
Yes, standalone export tariffs accept outside customers. But the strongest export rates are typically bundled deals reserved for the supplier's own import customers, so mixed setups usually settle for mid-table rates. Compare both routes with your actual numbers before deciding.
Related reading
- SEG rates comparison
- Solar export tariffs compared
- Smart meters and solar
- What is MCS certification?
- Battery time-shifting explained
Paperwork included, always
We are Spectrum Energy Systems, MCS certified (NIC200223), installing solar across the East Midlands since 2011 with the certification and grid registration that unlock export payments handled on every job. Call 0115 773 7575, 8am to 8pm, Monday to Friday.
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