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A quieter shift is starting to take shape in the US solar space and it’s coming from something much smaller than rooftop systems. Plug-in solar, essentially compact panel kits that connect directly to a standard outlet, is beginning to pick up attention across multiple states. These systems don’t need complex installations or professional setup, and they can power everyday appliances like refrigerators, washing machines or work setups by reducing how much electricity is pulled from the grid.

What’s driving interest is simple: cost and accessibility. Compared to traditional rooftop solar, plug-in systems can be dramatically cheaper often a fraction of the price. While a full rooftop setup in the US can run quite high, smaller plug-and-play kits are far more approachable, especially for renters or people living in apartments who typically don’t have access to solar at all. This isn’t a new concept globally. Countries like Germany have already seen widespread adoption, with over a million such systems installed. In many cases, supportive policies including simplified regulations and renter-friendly rules helped accelerate that growth.

The US, however, is still catching up. Right now, only a few states have started adjusting regulations to accommodate these smaller systems. Utah has already made changes to allow plug-in setups under a certain size without the heavy rules applied to rooftop solar. Meanwhile, states like Vermont and Virginia are moving in a similar direction, with bipartisan backing. The main hurdle remains regulation. Current approval processes are often slow, expensive, and designed for larger installations making them a poor fit for small, plug-in systems. But that’s starting to change as more states look to simplify rules, update safety standards, and clarify rights for renters and homeowners.

Interestingly, this momentum is building even as federal support for renewables faces uncertainty. In fact, that may be part of the reason plug-in solar is gaining traction it gives individuals a way to act locally, without relying on large-scale policy or incentives. From an economic standpoint, the appeal is clear. Early estimates suggest these systems could pay for themselves in around five years, with costs expected to drop further as adoption increases. If regulatory barriers continue to ease, plug-in solar could follow a similar path to Europe starting small, then scaling quickly as it becomes a practical option for everyday households.

https://www.yahoo.com/news/articles/scientists-achieve-impossible-solar-efficiency-153359421.html

The UK’s solar sector isn’t loud or flashy right now but beneath the surface, it’s moving faster than it has in years. Solar still makes up a modest share of the country’s electricity (around 6.5% in 2025), yet the growth tells a different story. Installed capacity has climbed to roughly 21.8 GW across nearly 2 million systems, marking a strong year on year increase. In fact, solar capacity now comfortably exceeds nuclear in raw numbers even if nuclear remains more consistent in output.

What’s more striking is the pace of adoption. A few years ago, the UK was adding just a few thousand systems per month. Now, that number has jumped to over 20,000 monthly installations, with more than a quarter million systems added in 2025 alone the highest annual figure in a decade. Large scale projects are contributing too. New additions like one of the country’s biggest solar farms (373 MW) highlight that both utility scale and residential solar are expanding at the same time. But this growth isn’t guaranteed to continue smoothly.

A major concern lies in supply chains. The UK, like most of Europe relies heavily on Chinese solar imports. Policy changes from China, including the removal of export tax rebates, could push panel prices higher. At the same time, rising material costs (like silver and silicon) are adding pressure across the manufacturing side. Closer to home, tax policy could also shape adoption. The current 0% VAT on solar installations is set to expire in 2027, reverting to 5%. While that might sound small, it directly increases upfront costs something that already influences whether households decide to install solar or not. Still, there’s another development that could completely change the game. The UK is moving toward legalising plug in solar small systems that can be installed on balconies or in gardens and connected directly to a home’s power supply. These systems are already widely used in countries like Germany, where millions of users have adopted them, including renters.

If implemented well, this could open solar access to a much wider group of people especially those who don’t own rooftops. The key questions will be around regulation: whether installations require professional approval and how landlord permissions are handled. If those barriers stay low, plug in solar could dramatically accelerate adoption.

Despite its reputation for cloudy weather, the UK isn’t actually at a disadvantage compared to countries already seeing strong solar uptake. In fact, many regions receive comparable sunlight to parts of Germany where solar is thriving. So while cost pressures and policy shifts could slow things down, the bigger picture is still pointing in one direction: solar in the UK is no longer niche it’s becoming a meaningful part of the energy system. And what happens next will depend less on technology, and more on the decisions being made right now.

[Image: Ed Miliband, Secretary of State for Energy Security and Net Zero, leaves the Labour party 2024 manifesto launch]

Researchers from Kyushu University and Johannes Gutenberg University Mainz have developed a new approach that allows solar systems to generate more than one unit of energy from a single photon, reaching around 130% quantum yield. Traditional solar cells are limited by the Shockley Queisser limit, which restricts how much sunlight can be converted into electricity. This happens because low energy photons can’t activate electrons, while high energy photons lose excess energy as heat, meaning only a fraction of sunlight is effectively used.

To overcome this, scientists used a process called singlet fission, where one photon creates two energy carriers (excitons) instead of one. While this concept has been studied before, capturing and using that extra energy efficiently has been a major challenge. The breakthrough came from using a molybdenum based “spin-flip” emitter, which allows the system to capture the extra energy generated during singlet fission while minimizing losses caused by energy transfer mechanisms like FRET.

In experiments using tetracene-based materials, the system achieved about 130% quantum yield, meaning more energy carriers were generated than the number of photons absorbed. Although still at a proof of concept stage, the research opens the door for next generation solar technologies and could also have applications in LEDs and quantum technologies.