With rising energy bills, increased climate consciousness, and progressive government targets, more UK households and businesses are considering solar power than ever before. The move towards renewable energy isn’t just a trend; it’s a critical transformation. In 2025, the UK’s solar industry is at a pivotal point—offering competitive options, modern technology, and scalable solutions for consumers across various sectors.
But with so many companies claiming to offer the best solar panel solutions, how do you identify the most trustworthy, efficient, and forward-thinking providers?
This article ranks the top 10 solar companies in the UK for 2025, evaluating them based on performance, credibility, and innovation. Whether you’re a homeowner exploring cost-effective energy options or a commercial developer seeking sustainable solutions, this guide will help you make an informed decision.
Investing in solar energy is a long-term decision. While the technology has become more affordable, the quality of the installation, system design, and aftercare can significantly affect your return on investment.
Working with a reputable solar company ensures the installation complies with UK regulations, qualifies for government incentives like the Smart Export Guarantee (SEG), and delivers maximum efficiency. Moreover, certified installers often offer extended warranties, professional customer service, and ongoing system monitoring—factors that can influence both system performance and peace of mind.
In 2025, with the rise in hybrid solar systems and smart energy storage, choosing a knowledgeable installer is more important than ever.
To curate the most accurate and relevant list of top solar companies, several industry-relevant criteria were used:
As of 2025, the UK has solidified its position as a European leader in solar energy adoption. According to the UK government’s Department for Energy Security and Net Zero, more than 1.5 million homes are currently equipped with solar panel systems. In parallel, commercial adoption has grown significantly, particularly among logistics centres, manufacturing units, and public sector buildings.
Several drivers have contributed to this surge:
The outlook for 2025 and beyond is positive, with analysts forecasting annual growth of over 10% in the UK solar sector.
Solar panel installers in the UK must comply with a number of regulatory and quality assurance standards. The most significant of these include:
Together, these certifications serve as a safeguard for consumers, ensuring transparency, accountability, and professional conduct.
In 2025, the benefits of solar power in the UK go well beyond just reducing electricity bills. For homeowners and businesses alike, solar energy offers tangible financial, environmental, and technological advantages.
Financial Benefits
Modern solar systems allow homeowners to generate and consume their own electricity, reducing reliance on the national grid. Excess electricity can be sold back to the grid through SEG, creating an income stream. In commercial settings, solar significantly offsets operational costs and improves sustainability reporting.
Environmental Impact
Switching to solar directly reduces greenhouse gas emissions. A standard residential solar panel system can reduce a household’s carbon footprint by nearly one tonne of CO₂ per year.
Technological Integration
The rise of smart meters, home battery storage, and EV charging stations has made it easier than ever to create an integrated energy ecosystem. Many of the top UK solar companies offer all-in-one solutions that future-proof properties for evolving energy needs.
The cost of solar panel installation varies depending on system size, battery inclusion, and location. Here is an estimated cost range in 2025:
| System Type | Average Cost (2025) | Estimated Annual Output | Ideal For |
| 3kW | £5,500 – £6,000 | 2,500–3,000 kWh | Small homes |
| 4kW | £6,000 – £7,500 | 3,000–4,000 kWh | Medium homes |
| 6kW | £8,000 – £10,000 | 4,500–5,500 kWh | Large homes or businesses |
| Battery Storage (5kWh) | £2,500 – £4,000 | – | Paired with hybrid systems |
Financing options, green home loans, and government VAT exemptions on solar products can further reduce the upfront cost.
There are three main types of solar systems available in the UK:
The choice of system depends on energy usage, location, and long-term goals. Most residential customers now opt for hybrid systems due to their flexibility and reliability.
Project Solar UK stands as the UK’s leading solar installation company with over 45,000 installations nationwide. Renowned for its end-to-end service, this provider excels at helping homeowners transition to cleaner, more cost-efficient energy.
What sets Project Solar UK apart is its combination of advanced solar technology, transparent pricing, and comprehensive warranties. Their solar solutions not only cut electricity bills—up to 70% savings reported by customers—but also future-proof homes with options for EV charging and battery storage integration.
The company’s flagship product, the Evolution Maxima 490W solar panel, exemplifies their focus on performance and durability. Designed to withstand the UK’s unpredictable weather, these panels maintain high output even on overcast days and come with a lifetime warranty on select systems.
Moreover, Project Solar is accredited by HIES (Home Insulation and Energy Systems), a CTSI-approved consumer protection scheme. This offers clients added confidence, with protections ranging from deposit safeguards to work guarantees.
Key Product Features – Evolution Maxima Solar PV Panels
| Feature | Description |
| Power Output | 490W high-efficiency output |
| Weather Resistance | Certified for wind (2400 Pascal) and snow (5400 Pascal) loads |
| Performance in Low Light | Excellent performance during overcast conditions |
| Temperature Coefficient | Enhanced energy yield in working environments |
| Warranty | Lifetime warranty on select solar and battery systems |
Why Customers Choose Project Solar UK:
Project Solar UK’s value lies not just in their panels, but in their full-service, transparent, and customer-first approach to clean energy.
As one of the UK’s fastest-growing solar companies, Evergen offers a forward-thinking approach to residential and commercial solar. With over 12 years of experience, they specialise in integrating solar PV and battery systems with flexible payment models and expert support.
For residential customers, Evergen provides zero-upfront-cost installations, making it easier for homeowners to access renewable energy. These systems are maintained by lenders, who also cover any required repairs, offering a no-fuss, all-inclusive energy solution. Customers benefit from fixed energy pricing, guaranteed power supply, and no maintenance concerns—making it one of the most convenient solar offerings in the UK market.
In the new build sector, Evergen partners with homebuilders to install roof-integrated solar systems. These contribute significantly towards achieving lower EPC ratings while also adding value to the property. Their process includes designing accurate 3D solar panel layouts based on architectural plans, ensuring maximum efficiency and full MCS certification compliance.
Residential & New Build Solar Options with Evergen
| Service Type | Key Features |
| Residential Solar | Zero upfront cost, no maintenance, fixed contract pricing |
| Commercial Solar | PPA model, energy cost reductions without capital expenditure |
| New Build Projects | EPC-compliant designs, SAP-based modelling, 3D solar layouts |
| Roof Integration | Discreet, modern appearance, optimised for high efficiency and EPC results |
Why Choose Evergen:
Evergen is not just a solar installer—they’re energy partners for the long haul, with scalable options for all types of properties.
Established nearly two decades ago, Joju Solar is one of the UK’s longest-serving MCS-accredited renewable energy companies. Known for their technical expertise and ethical focus, Joju provides tailored solar PV systems, battery storage, and EV charging solutions for homes, schools, local authorities, and businesses.
The company has won multiple awards for its community solar projects and large-scale custom installations. Their holistic approach starts with a full site analysis and follows through with smart grid technology and performance monitoring.
Joju is also a preferred choice for institutions and local councils due to their ability to deliver on both scale and complexity. Whether you’re a homeowner looking for independence or a school aiming for sustainability, Joju adapts the solution to meet both needs and budgets.
Joju Solar – Core Services and Capabilities
| Service Area | Highlights |
| Residential Solar | Custom panel systems with battery options for maximum energy autonomy |
| Commercial Projects | Institutional-grade systems for councils, schools, and universities |
| EV Charging | Smart, scalable solutions for home and workplace use |
| Battery & Grid | Advanced storage and smart grid integration for energy independence |
Key Differentiators:
Joju Solar remains a pioneer in the renewable energy space, prioritising quality, community, and self-sufficiency over mass-market scalability.
Effective Home Ltd is a nationally trusted name in solar panel installations, solar batteries, and home energy efficiency solutions. With over 15 years of industry experience, this company is dedicated to reducing both household energy bills and carbon emissions.
Effective Home provides complete solar solutions with options for solar panel-only setups or full system bundles that include premium batteries from brands like Tesla, JA Solar, and Longi. Their goal is to make solar accessible through 0% VAT, no-obligation surveys, and competitive monthly finance plans starting from as low as £70.
The company also leads in offering solar and insulation bundles, and actively helps homeowners access government grants to reduce installation costs further.
Effective Home – Featured Products and Services
| Product / Package | Key Highlights |
| JA Solar Black Panels | Higher output, lower resistance, 25-year warranty |
| Longi Hi-MO 5m Panels | Gallium-doped technology, optimised parameters |
| AIKO 450 Black Panels | N-type cells, 30-year performance warranty |
| Battery Bundles | Includes Sunsynk batteries, reduces energy bills up to 70% |
| Tesla Powerwall 3 | State-of-the-art storage with grid interactivity |
Why Choose Effective Home:
Effective Home’s strength lies in its professional delivery, flexible packages, and its position as a reliable long-term energy partner for UK households.
Deege Solar is a family-run business that has grown into one of the most highly respected solar companies in the UK. Specialising in solar panels, battery storage, EV charging, and off-grid systems, Deege Solar installs systems across the entire UK and has completed thousands of installations.
Certified by MCS, RECC, EPVS, and Napit, Deege Solar combines technical proficiency with a strong focus on consumer transparency. Their product catalogue spans residential solar systems, commercial PV, and bespoke off-grid packages featuring Victron and Pylontech technologies.
Their systems are carefully designed to maximise energy independence while significantly reducing energy bills. For those seeking cutting-edge installations, Deege’s commercial solar offerings include integrated battery storage for enhanced savings and resilience.
Deege Solar – Commercial Package Examples
| System Type | Price (from) | Key Components |
| 4kW Commercial System | £8,995 | 10x 400W panels, 5kW inverter, MCS certification |
| 9kW Commercial System | £12,595 | 22x 400W panels, 10kW inverter |
| 10kW System with Battery Storage | £19,795 | 25x 400W panels, 10kWh storage, hybrid inverter |
| 50kW Commercial System | £44,995 | 125x 400W panels, 50kW inverter |
Off-Grid Solutions
Deege also specialises in custom off-grid solar systems, perfect for rural or remote properties, holiday homes, and caravan sites. Their off-grid packages use top-tier components such as Victron Smart Solar and Pylontech batteries, ensuring autonomy and resilience.
Why Choose Deege Solar:
Deege Solar embodies a mission-driven approach—simplifying the journey to clean energy, while ensuring every customer receives a system designed for lasting impact and performance.
Greener Energy Group is more than just a solar company—it’s a full-service energy efficiency provider helping UK households become self-sufficient through solar PV, battery storage, and smart home solutions. Recognised for their consumer-focused approach, they offer interest-free finance options (0% APR) on selected energy systems and access to substantial government grants.
Their solar and battery storage packages are designed to help homeowners maximise their energy use—from 30% efficiency up to 90%—by storing unused electricity for later use and tapping into off-peak tariffs through suppliers like Octopus Energy.
For households unable to install solar panels due to planning restrictions or unsuitable rooftops, Greener Energy Group offers standalone battery systems that work exclusively on Smart Tariffs, charging overnight and discharging during the day for significant cost savings.
Greener Energy Group – Energy Efficiency Package Overview
| Component | Functionality & Benefits |
| Solar Panels | Generate electricity from sunlight to reduce reliance on the grid |
| Battery Storage | Store excess energy for nighttime use or off-peak grid charging |
| EV Chargers | Smart-controlled, solar-compatible, compact, and weatherproof charging for electric cars |
| Smart Tariff Setup | Full compatibility with tariffs like Octopus Go for optimal cost savings |
As an Octopus Energy Trusted Partner, Greener Energy Group also offers exclusive tariff guidance and integration support to further optimise your energy usage. Their product line includes Duracell residential battery systems, which are known for their safety, design, and performance.
Why Choose Greener Energy Group:
Greener Energy Group is making energy-efficient living both simple and accessible, enabling homes to cut carbon, lower bills, and take control of energy use.
Solar Fast is one of the UK’s fastest-growing and multi-award-winning solar companies, delivering high-performance residential and commercial solar installations. Known for their efficient project timelines and flexible payment options, Solar Fast offers customers a complete service—from consultation to system maintenance.
Their residential offerings include solar PV panels, inverters, battery storage, and EV chargers, all designed with ease of use, longevity, and environmental benefit in mind. They also provide access to Smart Export Guarantee (SEG) payments, helping customers monetise their surplus energy.
For businesses, Solar Fast offers customised commercial solar solutions using tier 1 solar panels, ensuring reliable performance and excellent ROI. Their commercial setups can be either roof-mounted or ground-mounted, making them adaptable for warehouses, factories, and even open land plots.
Solar Fast – Commercial Solar Installation Options
| Installation Type | Description |
| Roof-Mounted Panels | Ideal for commercial properties; compatible with flat or angled rooftops |
| Ground-Mounted Panels | Best for sites without suitable roof space; scalable to large installations |
| Battery Storage | Store unused energy for night-time use or back-up during outages |
Key Benefits of Choosing Solar Fast:
Whether it’s helping a family reduce their bills or supporting a business to cut operational costs, Solar Fast continues to set high standards for reliability, transparency, and service.
SunPower UK is part of a globally recognised solar brand known for its cutting-edge solar and solar-plus-battery systems. Their integrated setups are designed to provide storm-proof energy resilience, cost-saving efficiency, and green home upgrades that contribute directly to reducing the UK’s carbon footprint.
At the core of SunPower’s offering is a seamless solar-battery combination. During the day, the panels capture energy—even in cloudy conditions—and store excess electricity in robust battery units. At night or during outages, stored energy powers the home, making the system not only efficient but dependable during emergencies.
Customers are drawn to SunPower’s focus on energy independence. Their smart storage system allows households to draw energy exactly when it’s most beneficial—whether during peak hours, outages, or as a buffer against price hikes. This system is designed for those who want uninterrupted power, lower bills, and long-term sustainability.
SunPower – Solar Battery System Capabilities
| Feature | Advantage |
| Smart Energy Use | Stored energy can be used when grid prices peak or during blackouts |
| Always-On Security | Batteries ensure uninterrupted power, especially during storms or faults |
| Savings & Efficiency | Maximise ROI by minimising daytime and nighttime grid dependence |
| Eco-Living | Lower carbon footprint through full or partial grid independence |
Why Homeowners Choose SunPower:
SunPower’s promise is simple: always-on, always efficient, and always green. Their technology-forward systems appeal to UK households seeking ultimate energy control.
With a decade-long legacy in solar technology and energy services, Evergreen Power UK delivers high-quality solar PV systems, batteries, and EV charging infrastructure for both homes and businesses. Since its founding in 2013, the company has focused on affordability, trust, and compliance with the UK’s highest energy standards.
What makes Evergreen Power UK unique is its strong portfolio of certifications and guarantees. As TrustMark, BBA, MCS, NAPIT, and EPVS accredited installers, they operate under the PAS 2030 and 2035 standards. This ensures every installation is professionally engineered, fully regulated, and eligible for government green deal funding.
They also offer a compelling price promise, pledging to beat any like-for-like competitor quote. This, combined with stellar customer reviews and a history of successful installations, has made Evergreen Power a household name among solar-savvy UK customers.
Evergreen Power UK – Core Service Offerings
| Product/Service | Notable Features |
| Solar Panels + Battery | Custom configurations for home use; high storage efficiency |
| EV Chargers | Compatible with most electric vehicle models |
| AC Couple Inverter Charger | Seamless integration with solar PV and home battery systems |
| Roof & Ground Mount PV | Installations for all roof types and flat or sloped surfaces |
Why Evergreen Power Stands Out:
With its combination of technical capability, customer-first policies, and top-tier products, Evergreen Power UK delivers dependable clean energy with competitive rates and expert care.
Diamond Green Energy has grown from a small family business into a national name in solar, boilers, heat pumps, and home energy solutions. Led by a husband-wife duo since 2011 and now joined by the next generation, this company prioritises transparent service, quality installations, and long-term customer relationships.
Their solar services include tailored home installations using Which? Best-Buy rated products and manufacturer-backed warranties of up to 30 years. Customers can choose from flexible finance plans with little or no deposit, making solar accessible to a wider demographic.
Diamond Green Energy also offers modular care packages, allowing homeowners to scale their system based on energy needs, budget, or future plans. Their engineers are fully qualified, follow rigorous safety standards, and offer everything from initial survey to final commissioning under one roof.
Diamond Green Energy – Product and Service Overview
| Product Line | Key Advantages |
| Solar Panels | High-efficiency systems with long warranties and modular expansion options |
| Battery Systems | Integrated storage for increased independence and off-peak savings |
| Heat Pumps & Boilers | Reduce heating costs with up to 12 years parts and labour guarantees |
| Flexible Financing | Spread costs with 0% deposit and no hidden fees |
Why Diamond Green Energy Is Trusted:
Diamond Green Energy focuses not only on the technology but also on the customer experience, proving that long-term trust is still a winning business model in the modern solar market.
| Company Name | Key Services Provided | Certifications | Ideal For | Unique Selling Points |
| Project Solar UK | Residential & Commercial Solar, Battery | MCS, HIES, RECC | Homeowners nationwide | Lifetime warranties, Evolution Maxima panels, 24/7 monitoring |
| Evergen | Residential, Commercial & New Build Solar | MCS | Developers & Residential | Zero-upfront cost plans, PPA models, 3D planning & EPC-compliant |
| Joju Solar | Solar PV, Battery Storage, EV Charging | MCS, NICEIC, RECC | Councils, Homes & Institutions | Award-winning, long-standing MCS installer, smart grid integration |
| Effective Home Ltd | Solar Panels, Batteries, Heat Pumps | EPVS, TrustMark, MCS | Cost-conscious homeowners | Wide product range, 0% VAT, top solar brands like JA & Longi |
| Deege Solar | Residential & Commercial Solar, Off-Grid | MCS, EPVS, RECC, NAPIT, IWA | Homes, Off-grid, SMEs | Nationwide installs, off-grid specialists, Victron + Pylontech systems |
| Greener Energy Group | Solar PV, Battery Storage, EV Chargers | Octopus Energy Partner, HIES | Scottish homeowners | Smart tariffs, energy independence focus, EV & heat pump integration |
| Solar Fast | Residential & Commercial Solar + EV Chargers | MCS, Tier 1 Equipment | Homes & Growing Businesses | Award-winning, rapid install, lifetime support, strong warranties |
| SunPower UK | Solar Panels & Battery Storage Systems | Manufacturer Certified Installers | Eco-conscious households | Energy storage, outage protection, high-performance panels |
| Evergreen Power UK | Solar PV, Battery, EV Charging | MCS, TrustMark, BBA, EPVS, NAPIT | Budget-focused homeowners | Price match guarantee, PAS 2030/2035 compliant, Green Deal certified |
| Diamond Green Energy | Solar Panels, Boilers, Heat Pumps | MCS, Which? Approved | First-time solar users | Family-owned, no deposit finance, long warranties, friendly service |
The UK’s transition to clean, renewable energy is no longer optional, it’s essential. As energy costs continue to rise and sustainability becomes a national priority, investing in solar power is a smart, future-focused decision for both households and businesses.
The ten companies highlighted in this guide are Project Solar UK, Evergen, Joju Solar, Effective Home Ltd, Deege Solar, Greener Energy Group, Solar Fast, SunPower UK, Evergreen Power UK, and Diamond Green Energy represent the best in innovation, reliability, and customer service. Each offers a unique set of strengths, from zero-upfront financing and advanced battery solutions to award-winning customer care and industry-leading warranties.
By choosing the right provider, you’re not only saving on your energy bills, you’re making a long-term investment in energy independence and environmental impact. Whether you’re starting your solar journey or looking to expand an existing setup, these companies offer trusted pathways to a brighter, greener future.
Look for MCS, RECC, EPVS, and TrustMark certifications to ensure safety, quality, and access to government incentives.
Most solar panels have a lifespan of 25–30 years, with many carrying performance warranties up to 25 years or more.
Yes, battery systems can be used independently by charging from the grid using smart tariffs like Octopus Go.
Homeowners can save up to 70% on energy bills, especially when using battery storage and time-of-use tariffs.
Yes, schemes like the Smart Export Guarantee (SEG) and 0% VAT on installations are available for qualifying homes.
Yes, modern solar panels can generate electricity from diffused sunlight, even on overcast days.
Absolutely. Energy-efficient homes with solar panels are more attractive to eco-conscious buyers and can command higher resale value.
Copyrights © All Rights Reserved by UK Business Directory. Powered By ClickDo.