The Rise of Solar Energy in Europe
Solar energy has emerged as a shining star in Europe’s transition to clean energy, offering households a shield against the volatility of fossil fuel prices. With the ongoing conflict in the Middle East driving up oil and gas prices, Europeans are increasingly looking for ways to achieve energy independence.
In Germany, renewable energy firm Enpal BV has experienced a 30% increase in inquiries for solar panels since the US-Israel conflict began. Similarly, solar brand 1KOMMA5° GmbH has reported nearly double the interest in solar solutions. In the UK, energy company EON saw a 23% spike in solar interest between 23 February and 1 March, followed by a further 63% surge between 2 and 8 March.
Beyond Traditional Rooftop Panels
It's not just traditional rooftop solar panels that are gaining traction. According to SolarPower Europe, a trade association for the European solar photovoltaic (PV) sector, plug-in solar sales are also on the rise across the continent. However, exact figures remain elusive.
Germany has been a leader in the plug-in solar movement, with over one million systems installed between 2022 and 2025. This growth is largely due to government incentives such as feed-in tariffs, which provide a fixed price for electricity sent to the grid. Eliminating VAT and falling prices have made the technology more accessible.
Other European countries have been slower to adopt plug-in solar, but changes in legislation may soon change this. Belgium legalised self-installed panels last April, allowing homeowners to purchase plug-in PVs without needing a qualified installer. Spain has also seen a recent surge in sales, with Tornasol Energy installing over 1,300 homes with solar kits last year.
The UK is now following suit, with budget retailers like Lidl and Iceland offering low-cost panels. Out of the 27 EU member states, only Sweden and Hungary still prohibit self-installed plug-in solar devices.
Comparing Plug-In Solar and Traditional Rooftop Panels
The cost of rooftop solar in Europe varies significantly depending on the system size and whether a solar battery is included. Prices can range from €7,000 to €30,000, though several countries offer grants to help with installation costs.
The payback period for rooftop solar depends on various factors, including panel placement, sunlight exposure, and energy consumption habits. In the UK, the Energy Savings Trust estimates that a London home with rooftop solar could save £650 (€750) annually if the occupants are home all day. This drops to £530 (€611) if they're out until 6pm on most days.
For those who consume electricity during daytime hours, such as retirees or remote workers, rooftop solar offers significant benefits. Kian Milroy, a renewables electrical engineer at Heatable, notes that a typical rooftop system can make a substantial dent in bills, especially for homes with high daytime use through EV charging or heat pumps.
Milroy describes plug-in solar, which starts at £400 (€461), as more of a "top-up product" suited for renters or those unable to install rooftop panels. While easier to install, it doesn't generate enough power to significantly impact bills.
Limitations of Plug-In Solar
Unlike in Germany, UK domestic plug sockets aren't generally designed for back-fed generation, meaning households with plug-in solar can't sell excess energy back to the grid. However, plug-in solar isn't intended to create large amounts of electricity; it's more geared towards powering always-on appliances like fridges and wifi routers.
Natalie Mathie, an energy expert at Uswitch.com, explains that plug-in panels generating between 400 and 500 watts may be able to power energy-efficient appliances like slow cookers but won't suffice for energy-intensive gadgets.
Analysis from Carbon Brief suggests that plug-in solar panels could save a typical UK household £1,100 (around €1,261) over their 15-year lifespan. In contrast, rooftop panels can save up to £15,000 (€17,316) or more, with most systems achieving a six to 10-year payback rate.
The Solar Rebound Effect
While many Europeans invest in solar to reduce their electricity bills, sometimes the opposite occurs. This phenomenon, known as the solar rebound effect, happens when households use more electricity because they perceive solar panels as a free resource.
Milroy notes that a small plug-in array may generate a few hundred watts, but homeowners might start using more electricity, leading to higher bills. This can delay the return on investment. However, maintaining stable electricity consumption can help offset this effect.
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