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100kW Solar System Cost UK: What You Need to Know

If you’re a business owner in the UK considering a switch to solar energy, you may be wondering about the cost of a 100kW solar system. Investing in solar power for your commercial property can bring significant benefits, but understanding the expenses involved is crucial. In this article, we’ll break down the factors influencing the cost of a 100kW solar system in the UK and provide insights to help you make informed decisions.

Understanding the Cost of a 100kW Solar System

Before we delve into specifics, let’s clarify what a 100kW solar system entails. A 100kW solar system is capable of generating 100 kilowatts of electricity from sunlight. This size of a system is suitable for medium to large commercial properties with substantial energy needs.

Factors Influencing the Cost

Several factors can influence the cost of a 100kW solar system in the UK:

  1. System Size: The size of the solar system is one of the most significant factors affecting the cost. A 100kW system will typically have higher upfront costs compared to smaller systems, but it can provide greater long-term savings on energy bills.
  2. Quality of Equipment: The quality of solar panels, inverters, mounting systems, and other components used in the installation can impact the overall cost. High-quality equipment may come with a higher price tag, but it can offer better performance and durability over time.
  3. Installation Complexity: The complexity of the installation process can affect costs. Factors such as roof type, orientation, shading, and structural considerations can influence installation complexity and, consequently, the overall cost.
  4. Incentives and Rebates: Government incentives, grants, and rebates available for solar installations in the UK can help offset upfront costs and reduce the overall investment required. It’s essential to explore available incentives to maximise cost savings.

Average Cost of a 100kW Solar System in the UK

While it’s challenging to provide an exact figure without knowing the specifics of your project, here’s a general overview of what you can expect in terms of costs for a 100kW solar system in the UK:

  1. Cost per kW: On average, the cost per kilowatt (kW) of installed solar capacity for commercial properties in the UK ranges, depending on various factors such as system size, equipment quality, and installation complexity.
  2. Total System Cost: For a 100kW solar system, you can expect total costs to range. Larger systems with higher capacity will naturally come with higher costs.
  3. Return on Investment (ROI): Despite the upfront investment, a 100kW solar system can provide a solid return on investment over time, typically ranging from 3 to 5 years. The exact ROI will depend on factors such as energy savings, incentives received, and system longevity.


While the cost of a 100kW solar system in the UK can vary based on several factors, it’s essential to consider the long-term benefits and return on investment. By investing in solar energy, businesses can reduce their carbon footprint, lower energy costs, and demonstrate their commitment to sustainability.

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