The 3 best solar energy companies in the UK

Introduction

If you’re searching for the best solar energy companies UK residents can trust, you’re in the right place.

I live in a semi off-grid cabin, where sustainability isn’t just a buzzword — it’s how I live every day. Like many others in the UK, I supplement my power with a small solar array to reduce my reliance on the grid and lower my carbon footprint.

As energy bills continue to rise, more people are turning to renewable solutions. Choosing from the best solar energy companies UK residents trust is a smart way to gain energy independence and secure long-term savings.

Whether you’re powering a home, running a business, or exploring off-grid living, this guide will help you compare the top solar panel installers in the UK and find the right fit for your project.

These providers stand out not only for excellent customer service and long warranties, but also for their commitment to sustainable living and energy self-sufficiency.

From domestic and commercial solar panel systems to off-grid solar setups, they’re helping households and businesses cut emissions and save money year after year.

What you’ll get from this guide:

• 🔍 A quick comparison of the top UK solar energy providers
• 🏆 In-depth reviews of companies like Joju Solar, Deege Solar, and Geo Green Power
• ✅ Practical tips for choosing a reputable, MCS-certified solar installer
• 🛠️ Bonus resources for those considering DIY solar kits or off-grid systems

Let’s dive into the best solar companies in the UK and help you find the right fit for your energy goals.

Quick Comparison Table

When it comes to comparing the best solar energy companies UK residents can choose from, the small details make all the difference. Whether it’s the types of properties they serve or the warranties and technologies they offer, these features can help you make the right decision.

To make things easier, here’s a quick-reference table that highlights key features across our top three picks:

How to Use This Table

• ✅ means the service is included as standard.
• “Optional” means availability may vary depending on your location or system.
• Warranty terms can differ depending on the components — especially for inverters and battery storage.
• Ratings are based on publicly available Google reviews at the time of writing.

👉 Quick Pick: Joju Solar leads the list for community-focused installs, while Deege Solar stands out as the best all-round service provider.

This table is based on our research and publicly available data. Always contact the company directly for the latest information and a personalised quote.

Joju Solar Review – Is It One of the Best Solar Energy Companies in the UK?

At a Glance

• 📍 Based in: Sheffield
• 🏠 Domestic installs: Yes
• 🏢 Commercial installs: Yes
• ⭐ Google rating: 5.0
• 🔋 Battery storage: Yes
• 🚗 EV charging setups: Yes
• 🔧 Warranty: 25 years (panels)

Why Joju Solar Made the List

Joju Solar continues to stand out as one of the most trusted solar panel installers in the UK. Thanks to their community-focused approach, transparent pricing, and consistent five-star reviews, they’ve earned a top spot on our list. That’s why they rank among the best solar energy companies UK residents can rely on for both residential and commercial installs.

As a Tesla Energy Certified Installer, Joju combines cutting-edge technology with a strong reputation for quality. They’ve partnered on some of the UK’s largest community solar schemes, showing they’re not just installing panels — they’re helping power a greener future.

Joju also works with over 80 councils across the UK, delivering clean, affordable energy to social housing and public buildings. This highlights their commitment to community values and long-term sustainability.

Standout Features

• 🌍 Community Projects: Joju led the UK’s first community-funded solar project and continues to champion “democratic energy.”
• 🏆 Highly Accredited: Certified by Tesla, SafeContractor, Exor, and NEC EIC — ticking all the right boxes for trust and safety.
• 🔄 Full-System Experts: From panels and batteries to EV chargers, they deliver integrated systems that work seamlessly together.

Pros & Cons

Pros:

• ✅ Outstanding 5-star rating on Google
• ✅ Strong track record with both homeowners and local authorities
• ✅ Ethical and community-focused approach

Cons:

• ❌ High demand can lead to longer wait times
• ❌ Not the cheapest option, but strong on value and service

Is Joju Solar Right for You?

Wondering if Joju Solar is a good company to trust with your solar project? The answer is a confident yes. If you’re looking for a reliable UK solar company that delivers top-tier installations with a strong social mission, Joju Solar is hard to beat. They’re especially well-suited for:

• Homeowners seeking a full-service system (solar + battery + EV charging)
• Councils or housing providers needing a trusted contractor
• Anyone who wants a balance of technology, ethics, and long-term performance

👉 Visit Joju Solar to learn more or request a free quote.

Deege Solar Review – Is This the Best All-Round Solar Installer in the UK?

At a Glance

• 📍 Based in: Essex
• 🏠 Domestic installs: Yes
• 🏢 Commercial installs: Yes
• ⭐ Google rating: 4.4
• 🔋 Battery storage: Yes
• 🚗 EV charging setups: Yes
• 🔧 Warranty: Up to 25 years (varies by product)

Why Deege Solar Made the List

Deege Solar has earned a strong reputation as one of the best all-round solar companies in the UK — and it’s easy to see why. With more than 25,000 installations and over 12 years of experience, they’ve proven themselves reliable for both residential and commercial projects.

That’s why they stand among the best solar energy companies UK homeowners and businesses can turn to for a complete, tech-forward setup.

What sets Deege apart is their commitment to combining smart technology with dependable service. They partner with leading brands like SolarEdge, Growatt, Panasonic, and Hyundai Energy Solutions, giving you the confidence that your system is built to last.

Standout Features

• 🥇 Award-Winning: Named Best Solar PV Installer of the Year (2022) and recognised in multiple commercial solar award categories.
• 🔧 Tech-Forward Systems: Seamlessly integrates smart inverters, EV charging hubs, and battery storage into each solar setup.
• 📚 Education First: Deege doesn’t just install systems — they educate. Their outreach and social media make solar more accessible for everyday homeowners.

Pros & Cons

Pros:

• ✅ Over a decade of experience with 25,000+ installs
• ✅ Offers complete systems with premium hardware
• ✅ Nationwide coverage with a highly skilled team

Cons:

• ❌ Some negative Google reviews remain unaddressed
• ❌ Affiliated with Octopus Energy, which receives mixed customer feedback

Is Deege Solar Right for You?

Still wondering if Deege Solar is any good? With thousands of installs and award-winning service, they’re hard to beat.

If you’re after a well-rounded, experienced installer that blends advanced technology with strong customer support, Deege Solar is a solid choice. They’re especially suited for:

• Homeowners seeking a modern solar setup with integrated battery and EV options
• Businesses looking for scalable, high-efficiency solutions
• Anyone who values a balance of affordability, performance, and industry credibility

👉 Visit Deege Solar to learn more or get a quote tailored to your energy needs.

Geo Green Power Review – Best Solar Installer for Businesses & Long Warranties

At a Glance

• 📍 Based in: Nottingham
• 🏠 Domestic installs: Yes
• 🏢 Commercial installs: Yes
• ⭐ Google rating: 4.3
• 🔋 Battery storage: Yes
• 🚗 EV charging setups: Optional/Project-based
• 🔧 Warranty: 25 years (panels), 20 years (inverters)

Why Geo Green Power Made the List

Geo Green Power stands out as one of the top UK solar companies, particularly for commercial installations and customers seeking long-term peace of mind. That’s why they deserve a place among the best solar energy companies UK businesses can rely on for dependable performance and large-scale solutions.

They’ve built trust by working with major brands like Volkswagen, JCB, and G4S, proving they can handle high-profile commercial solar projects with professionalism and precision.

What truly sets Geo Green Power apart is their ongoing investment in research and development. They continually work to improve solar efficiency and performance, demonstrating a future-focused approach that goes beyond simply selling panels.

They’re also one of the few UK solar companies offering 25-year panel warranties and 20-year inverter warranties, making them a standout choice if long-term protection is a top priority.

Standout Features

• 🏢 Trusted by Big Brands: Installed commercial systems for major names like JCB and Volkswagen.
• 🧪 Innovation-Focused: Actively invests in R&D to advance renewable energy technologies.
• 💬 Transparent with Feedback: Publicly responds to reviews and embraces ongoing improvement.

Pros & Cons

Pros:

• ✅ Industry-leading warranty coverage
• ✅ Proven experience with large-scale commercial projects
• ✅ Proactive and transparent customer communication

Cons:

• ❌ Fewer Google reviews compared to competitors
• ❌ Some historic aftercare concerns, though most have been addressed publicly

Is Geo Green Power Right for You?

Still asking whether Geo Green Power is a good company? With high-profile clients and exceptional warranty coverage, they’re a smart choice for serious solar investments.

If you’re a business owner seeking a reliable solar provider with deep commercial experience and long-term security, Geo Green Power is a top contender. They’re also a solid fit for homeowners who want a premium, long-lasting setup from a trusted name in the industry.

👉 Visit Geo Green Power to explore your options or request a personalised quote.

Bonus: Best DIY Solar Kits

Not everyone needs — or wants — a full solar installation from a company. If you live off-grid, in a cabin, or you’re looking to power a shed, campervan, or tiny home, DIY solar kits might be the perfect fit.

If you’re confident with basic electrical work and prefer having more control over your setup, buying a ready-to-use kit can save money and help you design a system that fits your lifestyle.

While the best solar energy companies UK wide are ideal for full-service installs, DIY kits like these offer flexibility and control — perfect for smaller, off-grid setups.

Not sure if you can install a solar kit yourself? If you’ve got basic electrical skills, it’s absolutely doable — and more affordable than you might expect.

🛠️ Sunstore Solar – Best for Self-Install Off-Grid Kits

Sunstore Solar is a UK-based supplier that specialises in high-quality DIY solar kits, battery storage options, and complete off-grid systems. They’ve built a strong reputation among cabin dwellers, vanlifers, and anyone setting up solar on a budget.

As someone who supplements their energy with a small solar array in a semi off-grid cabin, I can vouch for how helpful these kits are. You get everything you need in one package — no guessing, no mismatched parts.

Looking for solutions outside the UK? Check out our guide to the best off-grid solar systems in the USA for tailored options that support true energy independence.

What Makes Sunstore Solar Stand Out?

• 🔋 Complete kits for cabins, workshops, motorhomes, and boats
• 📦 Bundled systems with panels, charge controllers, batteries, and cabling
• 🔧 Helpful tech support for setup and troubleshooting
• 🚚 Fast delivery across the UK
• 💷 Competitive pricing and trusted by thousands of UK customers

Best For:

• DIYers with basic electrical skills
• Cabin and shed owners looking for reliable off-grid power
• Vanlife and motorhome travellers
• Anyone wanting a dependable backup or emergency power solution

Wondering if a DIY solar kit is right for you? If you’re handy and want to save money, it’s one of the best ways to start generating your own power.

👉 Check out Sunstore Solar kits here

How to Choose the Right Solar Installer for You

Finding the right solar panel installer in the UK isn’t just about grabbing the cheapest quote. It’s about making a smart, long-term investment in your home or business. A reliable installer can help you save money, lower your carbon footprint, and enjoy peace of mind for years to come.

Whether you’re comparing quotes or narrowing down the best solar energy companies UK wide, it helps to know what separates great installers from the rest.

So, how do you choose the best solar installer in the UK? Here are the key questions to ask and the credentials to look for:

✅ Check for Certifications

Start by checking that the installer holds key industry certifications:

• MCS Certified: Confirms they meet UK quality and safety standards.
• RECC Member: Ensures they follow ethical practices in renewable energy installations.
• NAPIT/NICEIC Accredited: Verifies proper electrical installation and regulatory compliance.

🔍 Look at Reviews and Case Studies

Take a good look at what past customers are saying:

• Google Reviews: Offer real insight into customer satisfaction.
• Case Studies: Look for projects similar to yours — residential or commercial.
• Response to Complaints: See how they handle issues. Transparency matters.

🛠️ Ask About Equipment and Warranty

Not all solar equipment is created equal. Ask whether they offer:

• High-quality panels and batteries (like SolarEdge, Growatt, or Tesla)
• Clear warranty terms on panels, inverters, and installation workmanship
• Insurance-backed warranties, in case the company goes out of business

🧠 Understand Their Process

A good installer should guide you through the process — not rush you. Be sure to ask:

• Do they offer a free consultation or site survey?
• Will they explain system sizing, savings estimates, and the installation process?
• Are they giving you time to decide — or pressuring you to commit quickly?

🏡 Domestic vs Commercial Focus

Some companies specialise in residential solar, while others focus on commercial installations. Make sure their expertise aligns with your needs.

🌿 Does Their Ethos Match Yours?

If sustainability, community support, or ethical business practices are important to you, choose a company that shares your values.

Taking the time to properly vet a solar installer pays off. With the right partner, your system will deliver clean energy and long-term savings. Not sure where to start? Begin with one of our top recommended providers — or explore Sunstore Solar for high-quality DIY kits if you’re going off-grid or want a simple, cost-effective solution.

Final Thoughts

Making the switch to solar energy is one of the smartest and most sustainable decisions you can make — but it all comes down to choosing the right installer. That’s why we’ve featured three of the best solar energy companies UK homeowners and businesses can trust, each offering excellent service, top-quality systems, and long-term value.

From community-driven pioneers like Joju Solar, to well-rounded professionals like Deege Solar, and warranty-focused commercial experts like Geo Green Power, you’ve got reliable options no matter your situation.

Whether you’re powering a home, business, off-grid cabin, or campervan — or just starting to explore DIY solar kits — there’s a solution to match your energy goals and lifestyle.

Not sure which one to go with? All three are well-reviewed and respected names in the UK solar market — whichever you choose, you’re in safe hands.

Ultimately, solar isn’t just about saving on energy bills — it’s about future-proofing your home, lowering your carbon footprint, and gaining energy independence.

Thanks for reading! If you’re living off-grid, beginning your solar journey, or simply curious about sustainable living, remember to check with us for more content!