What are Solar Panels?

Solar Panels are known by different names: solar PV panels , photovoltaic panels, solar cell panels, etc. So, how do solar panels work, and how do they generate electricity? To put it simply, most solar panels use the sun's energy for electricity generation through the photovoltaic effect. The panels use crystalline silicon cells or thin-film cells for this purpose. These cells are connected in series and are joined with a PV junction box. It is through the box that solar energy, as electricity, is supplied to households. The three common types of solar panels are Mono-crystalline panels, Poly-crystalline panels, and Thin-film solar panels.

What are Smart Meters?

The function of smart meters is to measure and record energy usage levels. In this regard, they are very similar to traditional energy meters. However, a smart meter is a digital device that can record the energy consumption levels and send the data regularly to the utilities keeping track of the same. In the UK, smart meters relay data using the DCC, a nationwide communication network. A smart meter can even send data every 15-60 minutes. Consequently, this eliminates the need to take precise meter readings towards the end of a billing cycle. Further, most smart meters come with a home display that can keep you updated about the amount of energy consumed in a day. In this way, by keeping tabs on your household’s daily energy consumption, you can save energy. Further, some smart meters can also alert energy suppliers in the area about power shortages and outages. That allows suppliers to resolve issues quickly and get the power supply restored as soon as possible. In the UK, two types of smart meters are very common: First Generation Smart Meters and Second Generation Smart Meters.

What are the Benefits of Smart Meters?

The benefits of smart meters are multi-fold. Some of them include: Accuracy : Given their ability to regularly monitor energy usage, a smart meter can equip homeowners with accurate and real-time data. Cost-Effective: Due to improved accuracy, smart meters make it possible for solar energy suppliers to send households energy bills of the right amount. Further, customers need not pay the meter reading costs associated with the traditional electricity and gas meters. Reduced Energy Wastage: Household owners can use the information provided by the smart meters to reduce their energy consumption. A lot of energy can be saved in this process. Safety: All smart meters adhere to safety regulations and are safe to use. Environment Friendly : The UK government introduced smart meters as a part of its initiative to establish a national grid that can provide efficient, renewable, and reliable energy to households across the country. Lower Tariffs : Nowadays, an increasing number of electricity suppliers in the UK have begun to offer discounts on the tariffs to households with a smart meter fitted. Incentives: As mentioned earlier, households with solar panels installed can become eligible for incentives under the smart export guarantee upon having a smart meter installed to measure the amount of energy they export to the grid.

Does a Smart Meter have Disadvantages?

As is the case with any technological device, smart meters also have a couple of downsides: Poor Connectivity : At times, smart meters might face signal issues, rendering them unable to communicate with the DCC. Incompatibility: Even though many solar energy suppliers offer smart meters to households, quite a few still don't support them. Installation : Smart meters require professional installation services, irrespective of whether they are SMETS 1 or SMETS2. The process can take a couple of hours. Occasional Inaccuracy : At times, the In-Home Display (IHD) may show inconsistent and inaccurate information that you need to be wary of.

Is it Compulsory to Have a Smart Meter?

Here’s the thing. Earlier this year, in July, the UK administration introduced a new regulatory policy. Under this policy, every major energy supplier will have to comply with the pan-nation rollout of smart meters. That means that by 2025, every household and commercial establishment across the UK should be offered a smart meter by their energy provider. If providers fail to do this, it will be considered a breach, and their licenses could be revoked. Further, the administration has asked energy providers to ensure that households with SMETS1 installed are connected with a communications company to ensure their functionality even if customers choose to switch to a different supplier. So, while it looks like it will be compulsory to have smart meters installed, you can still work around it. Many energy companies understand that customers have questions about smart meters. They have dedicated teams to handle your queries and walk you through the process.

Do I Have to Pay for a Smart Meter?

This question is a bit tricky to answer. While it is your energy provider’s responsibility to give you a free smart meter. In any case, any overhead tariff will be accounted for in your energy bills. In this regard, a smart meter is very similar to traditional meters.

Are Smart Meters Safe?

Smart meters are very safe. Most of them are bound by the EU and the UK Safety Regulations. This means that they are subjected to thorough testing processes. For that matter, a nationwide study even found that most of the meters exceed the required safety standards by a significant margin. Even the UK’s leading health organizations, like the Public Health England, have stated that the frequency range of these meters is less than that of other common appliances, like television sets. What’s more, given that these meters transmit information over a super-private network, there are very few opportunities for anyone to hack into the transmission between your generation meter and the IHD.

How to Read a Smart Meter Display?

Here’s a scenario for you to consider. Let’s say that your SMETS1 has lost connectivity and has stopped relaying energy usage information to your provider. In that case, you will have to take a manual reading. Thankfully, it’s very easy to take a reading. You just need to choose the ‘meter reading’ section on your meter’s display to view the relevant information. If you face any issues, it would be best to get in touch with your energy provider. You will find metering data covering power metrics like the voltage, current, and other related fields. Jot them down, and send them along to your power supplier.

Smart Meters and Solar Panels - Solar Panels Network

If you have solar panels in the UK and you’re not yet on the Smart Export Guarantee, there’s a good chance your smart meter setup is the missing piece. Smart meters, specifically second-generation SMETS2 meters, enable the accurate half-hourly export readings that most SEG tariffs require. Without the right meter, you can’t access the best export rates, and you may be sending surplus solar electricity to the grid for nothing.

This guide covers how smart meters work with solar panels, why SMETS2 meters specifically matter for SEG, what happens with half-hourly data, and how time-of-use tariffs let solar owners earn more from both their generation and their battery storage.

Contents

1 Key Takeaways
2 What Does a Smart Meter Do for Solar Panel Owners?
3 SMETS1 vs SMETS2: Why the Generation Matters
4 How Half-Hourly Data Works
5 SEG Tariffs and Smart Meters
6 Time-of-Use Import Tariffs for Solar and Battery Households
7 Does My Solar System Need to be Registered for SEG?
8 Case Study: Smart Meter Upgrade Unlocks Better SEG Rate
9 Expert Insights From Our Solar Panel Installers
10 Frequently Asked Questions
11 Summing Up

Key Takeaways

SMETS2 smart meters can record electricity export to the grid in half-hourly intervals, which is required by most Smart Export Guarantee (SEG) tariffs.
First-generation SMETS1 meters may not communicate properly when you switch energy supplier, upgrading to SMETS2 is recommended for solar households.
The SEG pays you for each unit of solar electricity exported to the grid, in 2026, the best rates are around 15p/kWh (Octopus Energy).
Half-hourly export data enables time-varying SEG tariffs that pay more for electricity exported during peak demand periods.
Smart meters also enable time-of-use import tariffs, allowing battery storage to charge cheaply overnight and discharge during peak hours.
Solar generation itself is not recorded by your smart meter, only export to the grid is metered at the supply point.

What Does a Smart Meter Do for Solar Panel Owners?

A standard electricity meter measures how much electricity your home imports from the grid. When you add solar panels, your solar generation flows first to your household loads, and only the surplus exports to the grid. A smart meter with export capability measures that surplus at the grid connection point, recording how many units you’ve exported in each half-hour settlement period.

This export reading is the basis for Smart Export Guarantee payments. Without a meter that can measure and communicate export readings, your energy supplier can’t verify how much you’ve exported, and either won’t pay you at all, or will use a deemed (estimated) export figure that is almost always lower than your actual exports.

For a typical 4kW solar system, the difference between receiving 0p per unit exported and 15p per unit exported can be £100 to £200 per year in income. Over the 25-year life of a solar system, that’s a meaningful sum that hinges entirely on having the right metering in place.

SMETS1 vs SMETS2: Why the Generation Matters

The UK smart meter rollout involved two generations of technology. First-generation SMETS1 meters use proprietary communication protocols that are tied to the original energy supplier. When you switch supplier, a SMETS1 meter typically loses its smart functionality and reverts to operating as a basic meter that requires manual readings.

SMETS2 meters use the national Data Communications Company (DCC) infrastructure, a standardised communication network that works across all suppliers. When you switch energy supplier with a SMETS2 meter, the meter retains its smart functionality immediately. For solar households who want to switch to an energy supplier offering better SEG rates, SMETS2 is essential: switching supplier with a SMETS1 meter may break the connection between your export readings and your SEG payments.

If you’re unsure which generation your meter is, check your meter display or ask your energy supplier. Suppliers are required to upgrade SMETS1 meters on request, and the installation is free to the homeowner.

How Half-Hourly Data Works

SMETS2 meters record your import and export in 48 half-hour slots throughout the day. This half-hourly settlement data is transmitted to the DCC and shared with your energy supplier, who uses it to calculate your SEG payments, import bills, and any time-of-use tariff charges.

Half-hourly granularity enables a new category of energy tariffs that simply weren’t possible with monthly meter readings. Rather than charging or paying a flat rate per unit regardless of when electricity was used or exported, time-varying tariffs can reflect the actual market price of electricity in each half-hour period, which varies enormously depending on demand, renewable generation, and grid conditions.

For solar households, the most valuable time-varying tariff features are higher SEG export rates during peak demand periods (typically late afternoon and early evening) and lower import rates during overnight off-peak periods when overnight wind and other low-carbon generation is abundant and demand is low.

SEG Tariffs and Smart Meters

The Smart Export Guarantee obliges licensed energy suppliers with 150,000 or more customers to offer at least one export tariff. The rate must be above zero but can otherwise be set by the supplier. In 2026, the range of available SEG tariffs reflects very different approaches:

Supplier	SEG Rate (indicative, 2026)	Type
Octopus Energy (Flux/Outgoing)	Up to 15p/kWh (variable)	Time-of-use / fixed
OVO Energy	12p/kWh	Fixed
E.ON Next	5.6p/kWh	Fixed
EDF Energy	4.6p/kWh	Fixed
British Gas	5.5p/kWh	Fixed

The difference between 4.6p/kWh and 15p/kWh is dramatic. A household exporting 1,500 kWh per year receives £69 from British Gas’s lower tariff or £225 from Octopus at the higher rate. SMETS2 metering is required for most of the better SEG tariffs, particularly those offering time-of-use variable rates.

Time-of-Use Import Tariffs for Solar and Battery Households

For solar households with battery storage, smart meters unlock a genuinely transformative set of tariffs. Octopus Intelligent Octopus, Octopus Flux, and similar tariffs charge very low rates for off-peak electricity (sometimes as low as 7p/kWh overnight) while charging peak rates of 35p/kWh or more during the evening peak. A solar battery system can be programmed to charge from the grid overnight at cheap rates, discharge during the evening peak, and also charge from solar PV during the day.

The economics of this “smart tariff arbitrage” can be striking. Charging a 10kWh battery at 7p/kWh costs 70p. Discharging it during the evening peak saves 35p/kWh, avoiding £3.50 of peak electricity consumption. The net benefit of one charge-discharge cycle is approximately £2.80, and with a smart battery system, this can happen automatically every day without any manual intervention.

SMETS2 metering is essential for these tariffs, as the energy supplier needs accurate half-hourly readings to calculate the correct time-varying charges and credits.

Does My Solar System Need to be Registered for SEG?

Yes. To receive SEG payments, you must register your solar system with an energy supplier offering an SEG tariff. You’ll need your MCS installation certificate (or MCS-equivalent documentation) and your system’s capacity in kW. The supplier will then arrange for an export meter reading baseline and begin paying for your exports from the registration date.

Systems installed before the Feed-in Tariff closed in April 2019 may already be receiving FiT payments, which included both a generation tariff and an export payment (calculated as a deemed 50% of generation). You cannot receive both FiT and SEG payments simultaneously, the two schemes are mutually exclusive.

Case Study: Smart Meter Upgrade Unlocks Better SEG Rate

Background

A homeowner in Leicestershire had a 3.5kW solar system installed in 2020. Their original supplier registered them on a basic SEG tariff at 3.8p/kWh with a SMETS1 meter. When they tried to switch to Octopus Energy for a better SEG rate, they discovered their SMETS1 meter lost its smart functionality on switch, meaning Octopus couldn’t read their export data remotely.

Resolution

They requested a SMETS2 meter upgrade from Octopus (free of charge). Within three weeks the new meter was installed and their half-hourly export data was flowing correctly. They moved to Octopus Outgoing at 15p/kWh for exports.

Outcome

Their annual solar export of approximately 1,200 kWh now earns £180 per year instead of £46, an improvement of £134 per year, with no additional hardware cost beyond the free meter upgrade.

Expert Insights From Our Solar Panel Installers

One of our senior solar panel installers with over 13 years of experience in domestic solar PV commented: “The SEG situation with smart meters trips up a lot of solar owners. They’ve had panels for a few years, they’re on an old SMETS1 meter, and they have no idea they could be earning three or four times more for their exports by switching to a better supplier and getting a free SMETS2 upgrade. It costs nothing and takes a few weeks. The half-hourly data also opens up Flux and Intelligent Octopus, which is where the real value is if you have a battery.”

Frequently Asked Questions

Do I need a smart meter for the Smart Export Guarantee?

Most SEG tariffs require a smart meter with export measurement capability, particularly the better-paying time-of-use tariffs. Some suppliers offer a deemed export rate that doesn’t require a smart meter, but these are almost always lower than metered rates. A SMETS2 meter is strongly recommended for any solar household wanting to maximise SEG income.

What is the difference between SMETS1 and SMETS2?

SMETS1 meters use proprietary supplier-specific communication and often lose smart functionality when you switch energy supplier. SMETS2 meters use the national DCC infrastructure and retain smart functionality across all suppliers. For solar households who want flexibility to switch suppliers for better SEG rates, SMETS2 is essential.

Can I get a free smart meter upgrade?

Yes. Smart meter upgrades are provided free of charge by energy suppliers under the national smart meter rollout programme. If you have a SMETS1 meter and want to upgrade to SMETS2, contact your current energy supplier or the supplier you want to switch to and request an upgrade. Installation typically takes a few weeks and requires a brief visit from an engineer.

Does a smart meter record my solar generation?

No. Your smart meter records electricity flowing to and from the grid at your supply point, it measures what you import from and export to the grid. Solar generation that is consumed directly within your home (self-consumption) flows from your panels to your appliances without passing through the meter and is not recorded. To monitor your total solar generation, you need a generation meter (typically installed by your solar installer) or inverter monitoring software.

What is the best SEG tariff in 2026?

The best SEG rates in 2026 are offered by Octopus Energy, with the Outgoing Octopus tariff paying around 15p/kWh for all exports. OVO Energy offers around 12p/kWh. Most other major suppliers offer 4 to 6p/kWh. For households with battery storage, Octopus Flux offers both variable export rates and cheap overnight import rates that can be very valuable when combined with smart battery control.

Can I receive Feed-in Tariff and Smart Export Guarantee at the same time?

No. FiT and SEG are mutually exclusive, you can only receive one export payment at a time. If you’re currently receiving FiT payments (available to systems accredited before April 2019), you should compare your FiT export payment with the best available SEG rate to determine which is more valuable. In most cases, FiT export payments are below 6p/kWh, making the best SEG tariffs more attractive.

What is Octopus Flux?

Octopus Flux is a time-of-use tariff designed for solar and battery households. It charges lower import rates overnight (cheap charging window), higher import rates during peak hours (incentive to discharge battery), and pays variable export rates that reflect market conditions. It’s designed to work with smart battery systems that can be programmed to respond to time-varying rates automatically. SMETS2 metering is required.

How often are SEG payments made?

SEG payment frequency varies by supplier, most pay monthly or quarterly. Octopus Energy typically credits SEG payments monthly. British Gas and EDF pay quarterly. Payment is calculated from the half-hourly export data recorded by your SMETS2 meter. You can usually monitor your export readings and estimated SEG income through your supplier’s online account or app.

Summing Up

Smart meters, specifically SMETS2 meters, are the foundation of a well-optimised solar panel setup in 2026. They enable accurate export measurement for SEG payments, unlock time-of-use tariffs that reward solar exports during peak periods, and make battery storage smart tariff arbitrage possible. If you have an older SMETS1 meter or no smart meter at all, requesting a free upgrade from your energy supplier is one of the easiest ways to improve the financial return from your solar system. And if you’re considering installing solar panels, our MCS-certified team can guide you through the metering, SEG registration, and tariff options that make the most of your investment.

Updated April 2026