What solar actually saves in Scotland, worked out properly
Three different numbers get called a saving, and only one of them is money you stop spending. The biggest saving comes from units you generate and use yourself, displacing electricity bought at the day rate. The second comes from charging a battery cheaply overnight and using it during the day. The third, and smallest, is export income under the Smart Export Guarantee.
A unit you use yourself is worth more than a unit you sell. Any quotation built mainly on export income is built on the cheapest of the three. According to the Energy Saving Trust, a typical Scottish household with solar panels uses roughly half of what the panels generate on site, with the rest exported or stored. We model the split on your actual usage, not a national average.
What counts as a saving?
Three different things get called a saving, and they are worth very different amounts. Set side by side and ranked by value, the difference is clear.
The first and biggest saving is self-consumption: every unit your panels generate that you use inside the house is a unit you do not buy from your supplier. If your day rate is typically 25 to 30 pence per kWh, each self-used unit is worth that much. The Energy Saving Trust estimates that a household home during the day typically self-consumes 40 to 60 per cent of what its panels produce. The more you use at home, the larger this saving becomes.
The second saving is overnight arbitrage, which only applies if you have a battery on a time-of-use tariff. You charge the battery on a cheap overnight rate, typically 7 to 10 pence per kWh on tariffs like Octopus Agile or Economy 7, and use that stored electricity during the day instead of paying the full day rate. The gap between those two prices is your saving on every unit cycled, before the small losses in charging and discharging.
The third and smallest saving is export income. Under the Smart Export Guarantee, which Ofgem administers, licensed suppliers must offer at least one export tariff paying you for surplus electricity sent to the grid. SEG rates in late 2026 typically range from 1 to 15 pence per kWh depending on the supplier, and some of the best rates require you to buy your import electricity from the same supplier. A quotation built mainly on export income is built on the cheapest of the three.
For a detailed look at solar costs and how export payments work, see Cut Energy Bills Scotland. For more on home battery storage options, visit Home Battery Scotland. Part of the Scottish Energy Efficiency network.
How does solar work in the Scottish climate?
Solar panels generate from daylight, not direct sunshine, so they produce electricity year-round in Scotland including overcast days.
Generation estimates use the MCS calculation method, which applies a postcode-based sunshine zone, your roof direction and pitch, and a shading factor. The European Commission's PVGIS tool confirms that a typical south-facing roof in central Scotland generates around 700 to 900 kWh per kWp of installed capacity per year. A typical 4 kWp system in Scotland might therefore produce 2,800 to 3,600 kWh annually, with most of that arriving between March and September. Winter output is real but lower, typically 10 to 15 per cent of annual generation across December and January combined.
A battery is particularly valuable in Scotland because it stores surplus solar for evening use and cycles cheap overnight power through the darker months. Without a battery, surplus daytime generation goes to the grid at your export rate. With a battery, that unit is held until the evening, when it displaces electricity bought at the full day rate. The same battery can also charge on a cheap overnight tariff year-round, so it earns through winter even when solar generation is low.
How does getting a quote work?
Three steps, no obligation. You fill in one form, we model the numbers, and you receive a written quotation.
You tell us your postcode, your monthly or annual electricity spend, and your property type. We use that to model your potential savings across all three categories: self-consumption, overnight arbitrage and export. We then send a fixed-price written quotation from our MCS-certified installation partner, with MCS-listed equipment confirmed in writing. No scaffolding surprise, no hidden extras.
What is included in the installation?
Everything is part of the fixed-price quotation. No extras added later, no scaffolding surprise.
The fixed price includes MCS-listed solar panels, a battery sized to your usage and overnight tariff, the inverter and all electrical installation work, scaffolding, DNO notification and grid connection paperwork, the MCS certificate issued on completion, and an insurance-backed guarantee from our installation partner.
Interest-free credit up to £30,000 is available, subject to status. To see what paying monthly could look like, try the Solar Finance Calculator. Part of the Scottish Energy Efficiency network.
Should you not bother?
Honestly, not always. Here is who this is not for.
If you spend very little on electricity, the arithmetic will not work however it is presented. If you are moving house inside two or three years, the value is in the sale price, not the bill. If your roof is heavily shaded, faces north, or is structurally unsuitable, a proper survey will tell you and we will say so plainly rather than fit something that underperforms.
What should you ask any solar installer?
Ask these five before you sign anything. The answers tell you whether the quotation is real.
Ask for their MCS certification number, confirm they are TrustMark registered, check whether their guarantee is insurance-backed, ask if scaffolding is included, and find out who actually carries out the installation. We install through MCS-certified partners, and we confirm all of this in writing on every quotation.
How do you get a solar savings quote?
Fill in the form and we will model the arithmetic and send a written quotation from our MCS-certified partner.
Last updated: 5 November 2026