Plug-in Solar and Smart Meters: What You Need to Know
Will your smart meter work with plug-in solar? Can you see generation? Will it affect your bills? Everything answered.
The Smart Meter Question
It's one of the most common questions from people considering plug-in solar: "What happens with my smart meter?" The short answer is that plug-in solar works perfectly fine with a smart meter, but there are some nuances worth understanding.
How Smart Meters See Solar
Your smart meter measures electricity flowing in from the grid. When your plug-in solar panels are generating, they reduce the amount of electricity you're pulling from the grid. The meter sees lower consumption — it doesn't see solar generation directly.
If you're generating 500W of solar and using 800W in the house, your smart meter shows 300W of grid import. If you're generating 500W and only using 300W, the excess 200W flows back to the grid — and your smart meter records this as export.
This means your smart meter automatically reflects your solar savings. Your energy bills go down because you're importing less. No special configuration needed.
Will My Smart Meter Go Backwards?
No. Modern SMETS2 smart meters record import and export separately. They don't "go backwards" like the old economy meters that some early solar adopters benefited from. You'll see reduced import on your bill, and if your supplier pays for exports, you'll see export credits too.
Can I Get Paid for Exports?
Potentially, yes. The Smart Export Guarantee (SEG) requires energy suppliers with 150,000+ customers to offer a tariff for exported electricity. Rates vary from 1p to 15p per kWh depending on your supplier and tariff. For a typical 800W plug-in solar system, exports are modest — most of your generation gets used in the house — but every penny counts.
Check with your supplier whether they accept plug-in solar under SEG. Some currently only accept traditional rooftop installations, but this is expected to change as plug-in solar becomes more mainstream.
Monitoring Beyond the Smart Meter
Your smart meter shows net consumption, but it can't tell you how much solar you're actually generating. For that, you need a dedicated monitor.
Cheapest option: A smart plug on your inverter tracks real-time generation. The TP-Link Tapo P110 costs about £12 and shows exactly how many watts your panels are producing at any moment.
Best visibility: The Emporia Vue 3 clamps around your main supply cables and shows total home consumption alongside your smart plug's solar generation data. Suddenly you can see exactly how much solar is offsetting your grid use.
Check the Emporia Vue 3 on Amazon
In-Home Display Quirks
Your smart meter's in-home display (the little screen thing on your kitchen counter) might show some odd readings when solar is generating strongly. You might see very low or zero consumption during sunny periods, which is correct — your solar is covering your demand.
Some in-home displays can't show negative values (when you're exporting), so they'll just show zero. This doesn't mean anything is wrong; the meter itself is recording exports correctly even if the display can't show it.
Time-of-Use Tariffs
If you're on a time-of-use tariff (like Octopus Agile or Intelligent), plug-in solar becomes even more valuable. These tariffs charge different rates depending on the time of day — often 30–40p/kWh during evening peak and 10–15p/kWh overnight.
Solar generation peaks during the middle of the day when rates are moderate. But if you add a battery, you can store cheap solar energy and avoid the expensive evening peak entirely. The savings from peak-avoidance alone can justify a battery purchase within 2–3 years.
Check the EcoFlow DELTA 2 for solar storage on Amazon
Do I Need to Tell My Energy Supplier?
You should notify your DNO (Distribution Network Operator) via the G98 process — this is a simple online form that takes 5 minutes. You don't technically need your energy supplier's permission to install plug-in solar, but informing them is good practice and may be required to access SEG export payments.
For a step-by-step guide to the DNO notification process, see our G98 notification guide.
The Bottom Line
Smart meters and plug-in solar work together seamlessly. Your bills automatically reflect reduced grid consumption, exports are recorded separately, and adding dedicated solar monitoring gives you the full picture. No special meter replacement or configuration needed.
See how much plug-in solar could save you — with real data for your postcode.