Smart Meter Not Showing Solar Generation? Here's Why and How to Fix It

Your smart meter won't show solar generation directly — that's by design. Here's what it actually measures, what to look for instead, and how to properly track your plug-in solar output.

The Fundamental Misunderstanding

This is the most common smart meter question we get, and the answer surprises people: your smart meter does not and cannot show solar generation. That's not a fault — it's how meters work.

A smart meter sits at the boundary between your home and the grid. It measures what crosses that boundary: electricity flowing in (import) and electricity flowing out (export). It has no idea what's happening inside your home, including how much your panels are generating.

Think of it like a water meter at the street. It measures what flows in from the mains. If you have a rainwater tank feeding some of your taps, the water meter doesn't know — it just sees less mains water being used.

What Your Smart Meter Actually Shows with Solar

With plug-in solar panels running, your smart meter will show:

Lower import — during sunny hours, your panels offset some or all of your household demand. Instead of importing 500W from the grid, you might import only 100W. That's your saving.

Export (maybe) — if your panels generate more than you're consuming in that moment, the surplus flows to the grid. A SMETS2 meter records this on the export register. Some in-home displays show it as a negative number or a separate "export" figure. Learn how to read yours.

No change at night — once the sun sets, your import returns to normal. The smart meter can't tell you ever had solar.

How to Actually Track Solar Generation

If you want to see what your panels are producing (which you should — it's useful for spotting faults and optimising), you need a separate device:

The EcoFlow app — if you're using an EcoFlow STREAM system, the app shows real-time generation in watts, daily/monthly production in kWh, and self-consumption ratios. This is the easiest route for plug-in solar owners.

A smart plug with energy monitoring — devices like the Tapo P110 or Shelly Plus Plug S sit between your inverter's plug and the wall socket. They measure exactly what's flowing through. Cost: about £15.

A dedicated energy monitor — the Emporia Vue 3 or similar whole-home monitors use CT clamps on your consumer unit to measure individual circuits, including the one your solar feeds into.

Your inverter's built-in display — many micro-inverters have a small LED or Wi-Fi interface that shows current output. Check your inverter manual.

Why the In-Home Display Is Misleading

The in-home display (IHD) that came with your smart meter is designed for a simple use case: showing how much electricity you're using and what it's costing. It wasn't designed for solar.

Common IHD behaviours that confuse solar owners:

Shows £0.00 cost during high generation (because net import is zero)
Displays "0.0 kW" when you're actually exporting (it can't show negative import)
Shows yesterday's total as much lower than usual but doesn't explain why
Doesn't show export data at all on many models

The IHD is a blunt instrument. Use your supplier's app instead — Octopus, OVO, and E.ON all show half-hourly import and export data, which paints a much clearer picture.

Calculating Self-Consumption from Smart Meter Data

Even though your smart meter doesn't show generation, you can infer how well your solar is performing by comparing:

Import on a sunny day vs import on a cloudy day with similar household usage
Average daily import before solar vs average daily import after solar
Export register readings (if enabled) — this tells you how much surplus you're sending to the grid

If you know your panel rating (say 800W) and the hours of good sun, you can estimate generation. A south-facing 800W system in London generates roughly 2.5–3.5 kWh on a decent May day. If your import dropped by 2 kWh and you exported 0.5 kWh, that's about 2.5 kWh of generation — right in the expected range.

For precise tracking, the monitoring tools above are better. But smart meter data gives you a useful sanity check.

When to Worry

Import hasn't changed at all since installing solar — check the panels are actually generating. Look at the inverter's indicator light. If it's off during the day, something's wrong — possibly a tripped RCD, a faulty inverter, or panels that aren't receiving sunlight.

Export register shows nothing — it might not be enabled. Contact your supplier and ask them to activate it. More detail here.

Readings look wildly wrong — if your smart meter is SMETS1 and showing error codes or implausible readings, it may not handle reverse current flow properly. Request a SMETS2 upgrade.