Octopus Energy signed up its 300,000th solar customer last month. That is one in every eight UK solar households now managed by a single supplier. The question for the other seven is whether they should join them.
The Independent recently ran a verdict on Octopus solar panels, weighing the pros and cons for the average homeowner, as reported by The Independent. The piece highlighted the company’s slick app and flexible tariffs. But for a homeowner in a 1970s semi in Manchester, the decision rests on harder numbers than brand loyalty.
What Octopus actually charges
Octopus does not manufacture its own panels. It partners with installers and offers a fixed-price quote online. A typical 4kW system with 10 panels and a 5.2kWh battery comes in around £7,500–£8,000, according to quotes collected by Axiom readers. That is within £200 of the national average from the Microgeneration Certification Scheme database.
The catch is the battery. Without it, the system drops to about £5,500. But Octopus pushes the battery hard because it unlocks the Intelligent Octopus tariff, which charges just 7.5p per kWh overnight. A typical household using 3,500 kWh a year can shift half their usage to cheap hours and save roughly £150 annually on top of solar self-consumption. The battery pays for itself in about seven years under current prices.
Who qualifies, and who doesn’t
Octopus only installs on roofs it deems suitable: south, east, or west facing, with at least 20m² of clear space and no heavy shading. North-facing roofs are refused outright. That rules out roughly 15% of UK homes, based on Energy Saving Trust data.
You also need to be an Octopus electricity customer. If you are with Scottish Power or EDF, you cannot buy Octopus panels without switching supplier. That is a lock-in, though switching is quick under Ofgem’s seven-day transfer rules.
For renters or flat-dwellers, Octopus offers a subscription model, £49 a month for a 4kW system with no upfront cost. The catch is you do not own the panels, so you cannot sell them with the house. The EPC improvement also goes to the landlord, not you.
What it costs a typical 3-bed semi
Take a 3-bed semi in Leeds with a south-facing roof, using 3,200 kWh a year. A 4kW Octopus system with battery costs £7,800 installed. The household saves about £480 in the first year: £330 from self-consumption and £150 from shifting usage to the cheap overnight rate. The payback period is roughly 16 years.
But… the EPC impact is real. This home starts at band D (55). Adding solar and a battery lifts it to band C (69), potentially raising the property value by 2–3% according to Nationwide’s 2023 analysis. That means a £7,800 system could add £6,000–£9,000 to the sale price of a £300,000 house. If you sell within 10 years, the payback is effectively negative, you profit.
The maths changes if you have an electric vehicle. Octopus’s Intelligent Octopus Go tariff offers 7.5p/kWh for six hours overnight. Charging a car adds 2,000 kWh a year, but at that rate the cost is just £150. Without solar, the same charging on a standard variable tariff would cost £570. The solar + battery + EV combination is where Octopus really shines.
Yet there is a risk. Octopus’s fixed-price quote locks in the cost, but the savings depend on future electricity prices. If wholesale prices fall and Ofgem cuts the price cap, the value of self-consumption drops. The smart money hedges: buy the panels, but do not count on 2024’s high prices lasting forever.
What to do next: Get three quotes, Octopus, a local MCS installer, and a national firm like E.ON or British Gas. Compare the total cost, warranty (Octopus offers 25 years on panels, 10 on inverter), and tariff flexibility. Then check your roof on Octopus’s online tool. The whole process takes 20 minutes. If the numbers stack up, you could be generating by late spring.
Frequently Asked Questions
Not always. Octopus quotes are typically within 5% of the national average, but local installers can sometimes undercut by £500–£1,000, especially if you do not need scaffolding or a complex roof layout. The advantage of Octopus is the integrated tariff, you get the cheap overnight rate without switching supplier.
Yes. Octopus offers its own export tariff called Outgoing Octopus, which pays 15p per kWh for excess electricity exported to the grid, one of the highest rates in the UK. You can also choose other SEG providers, but you lose the bundled tariff discount.
