18 October 2026 | Upcoming Technologies | Solar Energy
What if you could generate significantly more electricity from your existing roof without making it any bigger? A British solar technology company is working towards making that possible, and its next generation of solar panels could become more widely available from 2027.
The company is Oxford PV, a University of Oxford spin-out developing perovskite-silicon tandem solar panels. Unlike conventional solar panels, these use two different light-absorbing materials to capture more of the sun’s energy.
For homeowners interested in reducing energy bills and becoming more self-sufficient, this is one of the more promising technologies to watch.
What’s the breakthrough?
Most solar panels installed on UK homes use silicon cells to convert sunlight into electricity. Manufacturers have spent decades improving their efficiency, but silicon has physical limits on how much of the sunlight it can convert.
Oxford PV’s approach adds a thin layer of a material called perovskite above the conventional silicon cell.
The two layers absorb different parts of the light spectrum, allowing the panel to convert more sunlight into electricity without increasing its surface area.
In 2024, Oxford PV announced a residential-sized demonstration module with an independently certified efficiency of 26.9%. That was an important milestone, although it does not mean every future commercial panel will achieve that figure.
In June 2026, Oxford PV and Germany’s Fraunhofer Institute for Solar Energy Systems also demonstrated a new panel construction using their combined technologies, showing that the approach continues to develop.
See how Oxford PV’s tandem solar technology works →
Why could this matter for ordinary UK homes?
Roof space is often one of the biggest limitations when installing solar panels. Terraced houses, smaller detached properties and homes with dormer windows or chimneys may have relatively little suitable space.
If a new generation of panels produces more electricity from the same area, homeowners could potentially:
- Generate more electricity without needing a larger roof.
- Reduce the amount of electricity purchased from the grid.
- Make better use of a home battery.
- Supply more of the electricity needed by a heat pump or electric vehicle.
- Improve the potential of homes where conventional solar installations are restricted by space.
However, generating more electricity does not automatically mean greater financial savings. Installation costs, electricity usage, export payments and the price of the new panels will all matter.
How much extra electricity could you generate?
Let’s take a simplified example of a household with enough suitable roof space for 20 square metres of solar panels.
| Solar panel efficiency | Rated output from 20 m²* |
|---|---|
| 22% conventional panel | 4.4 kWp |
| 25% tandem panel | 5.0 kWp |
| 27% future tandem target | 5.4 kWp |
*Illustrative calculation using standard test irradiance of 1,000 W/m², assuming the stated efficiency applies to the complete module area. Actual products, usable roof area and real-world output will vary.
In this example, moving from 22% to 27% efficiency would increase rated generating capacity by approximately 23% without increasing the panel area.
That is a meaningful improvement, particularly where roof space is limited.
But it is important to understand that 23% more rated capacity does not necessarily mean 23% lower electricity bills. Solar generation changes throughout the day and year, and households cannot always use all the electricity they generate.
When will these panels be available?
Oxford PV has already shipped early commercial tandem solar modules. However, widespread availability to ordinary homeowners is still developing.
The company’s published roadmap targets:
- 2027: Approximately 27% commercial module efficiency and the beginning of volume manufacturing.
- 2030: Approximately 30% module efficiency.
These are company targets, not guaranteed launch dates or confirmed performance figures for products available to UK households.
Oxford PV has also indicated that improving panel lifetime and manufacturing capacity is important to wider commercial adoption.
Read Oxford PV’s product roadmap and availability information →
What could these panels cost?
This is currently one of the biggest unanswered questions.
Oxford PV does not publish a standard UK residential retail price for its tandem modules. Pricing is available through direct commercial enquiries.
A more efficient panel might cost more to manufacture or purchase, particularly during early production. Whether that extra cost is worthwhile depends on how much additional electricity it generates over its lifetime.
For example, paying substantially more for a panel that generates only a modest amount of additional electricity might not offer good value. On the other hand, a homeowner with very limited roof space could find higher-efficiency panels particularly attractive.
We would want to see independently verified lifetime performance, installed UK prices and warranty details before recommending that homeowners pay a significant premium.
What are the potential drawbacks?
Although the technology is promising, there are still some important issues to consider.
Long-term durability
Conventional silicon panels have an established history of operating for decades. Perovskite-based panels have a much shorter commercial track record, so their performance over 20–30 years remains an important consideration.
Availability
Early commercial shipments do not mean the technology is readily available from ordinary UK domestic solar installers.
Price
Higher efficiency is useful, but homeowners ultimately need to know whether the extra electricity justifies the extra installation cost.
Winter electricity generation
More efficient panels can make better use of available sunlight, but they cannot eliminate the UK’s seasonal variation in solar energy.
A home that produces surplus electricity in summer may still need substantial grid electricity during the winter, especially if it uses electric heating.
Should you wait before installing solar panels?
Probably not solely because of this technology.
If you are considering solar panels today, there are already established products that could help reduce your electricity bills. Waiting for a future technology means potentially missing out on electricity generation and savings in the meantime.
However, if you are planning a major home renovation in 2027 or later, or you have particularly limited roof space, tandem solar panels are worth keeping an eye on.
The important comparison will be between the total installed price, expected annual electricity generation and long-term warranty of different systems.
The Homestead Project verdict
Potential: High
Affordability: Not yet established
UK household availability: Limited / developing
Worth watching: Yes
Perovskite-silicon tandem panels represent a genuine technical advance rather than an unproven energy-generation concept.
What makes Oxford PV particularly interesting is that the company has moved beyond laboratory research and early prototypes into commercial production, with ambitions to manufacture at much greater scale.
For UK homeowners, the real breakthrough will come when these panels can be purchased at competitive prices, installed by ordinary solar companies and backed by convincing long-term performance guarantees.
We will revisit this technology as new information becomes available, particularly UK retail prices, domestic availability and independently verified performance.
Explore more
Interested in generating more of your own electricity? Explore our solar energy guides and calculators to understand what a domestic solar installation could mean for your home.
Sources and further reading
- Oxford PV – Commercial modules and development roadmap
- Oxford PV – How tandem solar technology works
- Oxford PV – Residential-sized module efficiency record, June 2024
- Oxford PV and Fraunhofer ISE – New module development, June 2026
- PV Magazine – Manufacturing, durability and commercialisation plans, January 2026
Editorial note: This article is an independent overview based on publicly available information as of 18 October 2026. Company development targets are not guarantees. The Homestead Project has not independently tested Oxford PV panels.