Last reviewed: April 2026
Commercial rooftop solar is the most cost-effective way for UK businesses to generate their own electricity. By converting unused roof space into a power station, businesses typically reduce electricity costs by 30 to 60 per cent and achieve payback within 4 to 7 years.
KLY Energy delivers the full project lifecycle for commercial rooftop solar installations. From initial feasibility and structural assessment through to system design, Tier 1 panel procurement, installation by accredited engineers, and DNO grid connection, every stage is managed through a single point of contact with quality-controlled delivery throughout.
Systems are designed to match your daytime electricity consumption, maximising self-consumption and financial returns. For businesses not ready to invest upfront, installations can be funded through a Power Purchase Agreement (PPA) or alternative funding routes, delivering savings from day one with no capital expenditure.
Benefits
Why rooftop solar?
Reduce electricity costs
Generate free electricity from your roof. Most commercial systems reduce grid purchases by 30 to 60 per cent, with typical payback periods of 4 to 7 years.
Predictable energy pricing
Lock in a portion of your electricity supply at a known cost for 25+ years, reducing exposure to volatile wholesale energy markets.
Sustainability credentials
Demonstrate measurable progress against net-zero commitments. Each kWp of solar capacity avoids approximately 0.13 to 0.15 tonnes of CO2 per year, based on current UK grid carbon intensity.
Project delivery
Delivery scope
- ✓Feasibility and structural assessment
- ✓System design matched to consumption
- ✓Tier 1 panel and inverter procurement
- ✓Installation and commissioning by accredited engineers
- ✓DNO (Distribution Network Operator) application and G99 grid connection
Understanding the G99 grid connection
Any solar installation above 16A per phase (typically above 3.68 kWp) requires a G99 application to the local Distribution Network Operator (DNO). KLY Energy manages the entire DNO application process, including pre-application enquiries for larger systems, ensuring your installation meets all grid connection requirements and is commissioned without delay.
Suitability
Best for
Warehouses
Large unshaded roof areas ideal for high-capacity systems of 200 to 1,000+ kWp.
Factories
High daytime electricity demand closely matches solar generation profiles.
Offices
50 to 150 kWp systems that reduce operating costs and enhance building value.
Public buildings
Schools, leisure centres and council buildings with strong sustainability mandates.
Typical scale: 50 kWp to 1,000+ kWp
FAQ
Frequently asked questions
A typical commercial rooftop solar installation takes 8 to 16 weeks from initial survey to commissioning. Timelines depend on system size, structural requirements, and the DNO grid connection process. Larger systems above 200 kWp may require a G99 application, which can add 6 to 12 weeks depending on the local Distribution Network Operator.
Ready to explore rooftop solar for your site?
Every project starts with a conversation. Tell us about your building and we will outline what is possible.
Get in touch