Reacting to the Department for Energy Security and Net Zero press release “Households can save as plug-in solar panels come to market”, published 26 August 2026 and taking effect today, 27 August; and to BBC News, “Plug-in solar panels are coming to a shop near you — here’s what to know” by Jemma Crew and Matt McGrath, published 27 August 2026. Prices and the safety detail below come from those two pieces. Every energy figure is Ofgem’s published price cap data for 1 October to 31 December 2026, read directly today, or our own arithmetic on it, shown in full so you can check it.
Our view, before the detail. This is a good change and a genuinely new option for the millions of households who could never have rooftop solar — renters especially. But the number leading every write-up, “up to £110 a year”, is doing a lot of quiet work in that word up to. Work the £110 back through Ofgem’s own capped unit rate and it requires a very specific household: one where somebody is in, with things switched on, through the middle of the day, all year round. If that is not your house, the honest planning number is the other end of the government’s range, £70 — and at today’s launch price of £699 that is a ten-year payback on a device nobody has owned for ten years yet.
What actually changed today
From today, plug-in solar panels are legal to buy and use across Great Britain. They mount in an outdoor space or on some balconies, plug into a normal mains socket, and need no electrician to install. Each kit is limited by its microinverter to 800W of output — enough, the government says, to run a fridge, TV, router, laptop, phone charger and a games console at once while the sun is shining, or roughly a fifth of an average home’s electricity use in that moment.
Argos is stocking from today. Currys, Wickes, B&Q, Screwfix and Amazon have all committed to stocking them, with Currys and Wickes saying their products arrive in the coming weeks. UKSOL quoted the BBC £699 for a one-panel kit and £1,089 for a two-panel kit. The government expects prices to settle at £400 to £600 as competition builds and more products reach the market. The regulations allow one device per property, though a single device may contain more than one panel.
The number the headline is hiding
Here is the arithmetic nobody has published, and it is the whole story.
Ofgem’s capped electricity rate for 1 October to 31 December 2026 is 26.32p a unit, with a 54.83p daily standing charge, and no VAT on electricity from 1 October 2026 to 31 March 2027. Ofgem’s medium single-rate household uses 2,500 units of electricity a year.
- That household’s electricity bill annualised at those rates: £658.00 of units plus £200.13 of standing charge = £858.13 a year, or £71.51 a month.
- To save the government’s top figure of £110, you must self-consume 417.9 units of your own solar in a year. That is 1.145 units every single day — equivalent to the device running flat out at 800W for 1 hour 25 minutes a day, every day, and every unit of it being used inside the house. Including December.
- To save the bottom figure of £70 you need 266 units a year — 54 minutes a day at full output.
- The £110 is 16.7% of that household’s annual electricity, or £9.17 a month off a £71.51 monthly bill. The £70 is £5.83 a month.
The standing charge, £200.13 of that £858.13, is untouchable. No panel reduces it by a penny.
Now the payback, on the same figures. At the £699 launch price: 6 years 4 months if you hit £110, almost exactly 10 years if you get £70. At £1,089 for the two-panel kit: 9 years 11 months at best, 15 years 7 months at worst — and remember the 800W inverter cap means a second panel buys you more output on dull mornings, not double the saving. At the £500 the government expects prices to reach: 4 years 7 months at £110, 7 years 2 months at £70.
Read as a return rather than a payback, £110 on £699 is 15.7% a year, tax-free, which beats anything a savings account is paying — £699 sitting at Bank Rate, held at 3.75% on 30 July 2026, earns £26.21 a year before tax. But that comparison flatters it, because the £699 is spent, not saved. You cannot get it back, and the 15.7% only exists if the electricity is genuinely used as it is made.
The bit that decides everything: nobody pays you for the surplus
Rooftop solar is certified under the Microgeneration Certification Scheme, and that certification is what unlocks the Smart Export Guarantee — the scheme that pays households for power they send back to the grid. Plug-in devices are not MCS-certified, so they do not normally qualify. Anything you generate and do not use at that moment flows to the grid and earns you nothing at all.
That single fact reframes the purchase. You are not buying generation. You are buying the ability to convert daylight into a lower bill at the exact moments you are consuming. A household out from 8am to 6pm on weekdays has a daytime baseline of a fridge, a router and some standby — a few hundred watts against an 800W device — so most of a bright Tuesday is exported for free. A household with somebody in, running the washing machine, dishwasher and oven in daylight instead of the evening, captures most of it.
This is the same lesson as the October price cap: the published average describes a household, and the only question that matters is whether it describes yours. Our guide to cutting your bills works through the levers that apply regardless.
Do this before you spend £699
- Test your daylight demand for free, this week. Open your energy app or in-home display and look at your half-hourly usage for a normal weekday between 10am and 4pm. If your daytime draw sits well under 0.8kW and the house is empty, an 800W panel will export most of what it makes for nothing. That test costs nothing and answers the whole question before any money moves.
- If you are buying, verify the device is compliant before you pay. Legal sale requires testing against the G98 standard and the government product specification, and compliant devices are listed on the Energy Networks Association’s public register at connect-direct.energynetworks.org. Buy from an established retailer’s own site or store, not a marketplace seller — Electrical Safety First warns that some platforms are not legally responsible for the safety of goods sold through them.
- Get the wiring looked at if the property is older. Electrical Safety First’s guidance is that plug-in solar can interact badly with some older RCD shock-protection devices, and it recommends a check by a registered electrician where the age and condition of the wiring is unknown. Get a fixed quote for that check and add it to the £699 before you do the payback sums, not after.
- Tell your network operator within 28 days. Not your energy supplier — the company that owns the cables in your area. Find yours with National Grid’s postcode tool.
And the coaching point, which matters more than any of the above: £699 is a large, illiquid purchase with a payback measured in years. If it would go on a credit card you cannot clear this month, the interest will comfortably outrun a £70 saving, and the panel becomes an expensive way to make a debt bigger. Build the emergency fund first — that order is not negotiable, and our budgeting guide is the place to start. If money is already tight, free independent help from MoneyHelper, StepChange and National Debtline comes before any of this.
What is still uncertain, and when we will know
- The £400 to £600 price. This is a government expectation with no date attached. The thing to watch is the real listings as Currys, Wickes, B&Q, Screwfix and Amazon come to market over the coming weeks. Every £100 off the price takes roughly 11 months off the payback at the £110 saving.
- The one-device-per-property rule. The BBC reports this may change in future. No consultation date has been announced.
- The value of each unit saved. Ofgem’s zero VAT on electricity runs from 1 October 2026 to 31 March 2027. If 5% returns on 1 April 2027, every unit the panel displaces becomes worth slightly more, and the payback improves marginally. The cap for 1 January to 31 March 2027 is announced in late November.
- Whether export ever gets paid. Nothing has been announced about bringing plug-in devices into the Smart Export Guarantee. Until something is, treat every exported unit as worth nothing.
- Bank Rate, which sets the alternative use of the money, is decided next on 17 September 2026. It has been 3.75% since the Monetary Policy Committee held it on 30 July 2026.
Where coaching ends. This is money coaching, not regulated financial advice, and nothing here is a recommendation of any particular product, retailer or investment. Buzz Money Coach is a trading style of Buzz Money Ltd, which is not authorised to give regulated advice and does not. Where regulated advice is the right answer we say so, and can introduce you to Equity & General, authorised and regulated by the FCA (No. 474163) — entirely optional, with no obligation, and E&G pays us a commission on introductions that convert.
The honest summary is short. Plug-in solar is a real, useful product at a fair launch price, and for the first time it puts solar in reach of renters. But it pays a household that is home in the daytime and pays almost nothing to a household that is not, and no amount of hardware changes that. Spend twenty minutes with your smart meter data before you spend £699 — and if you want a broader picture of where your money actually stands first, our free tools are the place to start.