Carbon & Sustainability

Beyond the Financial Case

The financial case for commercial solar — lower electricity bills, export income, corporation tax relief, inflation hedge — stands independently. But for an increasing number of businesses, the sustainability case is becoming equally relevant to the investment decision.

Generating renewable electricity on site is one of the most direct and evidenceable steps a business can take to reduce its carbon footprint. Unlike many sustainability commitments, solar generation produces a measurable, independently verifiable reduction in emissions from the first day of operation.

The Carbon Numbers

The environmental impact of a commercial solar installation is calculated using the UK Government's published grid emission factor. The current UK grid emission factor is 0.233 kg of CO₂ per kWh of electricity consumed (DESNZ, 2024).

For a 50 kWp system generating 47,750 kWh per year in the South East:

Why This Matters in B2B Trading Relationships

Sustainability has moved from a reputational consideration to a commercial requirement for a growing number of businesses. Three specific scenarios where solar directly supports commercial objectives:

1. Tender responses and procurement questionnaires

Many public sector contracts and larger private sector supply chains now include sustainability questionnaires as part of the procurement process. These typically ask suppliers to document their carbon reduction activities, energy management practices and renewable energy use. A commissioned solar installation with an MCS certificate provides specific, verifiable evidence — not a statement of intent, but a demonstrated action with a quantifiable outcome.

2. Customer and supply-chain requirements

Large corporate buyers — retailers, manufacturers, logistics operators — are increasingly requiring their suppliers to demonstrate progress on Scope 3 emissions reduction as part of their own Net Zero commitments. Your electricity consumption is part of your Scope 2 emissions, and your customers' supply chain is part of their Scope 3. Solar directly reduces the Scope 2 figure you report, which supports your customers' own reporting obligations.

3. ISO 14001 and environmental management systems

Businesses operating under ISO 14001 or similar environmental management frameworks are required to identify and act on their significant environmental aspects. Electricity consumption is typically one of the most significant aspects for any commercial property. Solar is a directly evidenceable corrective action against this aspect, with measurable outcomes that can be documented in the management system.

Scope 2 Emissions — What Solar Achieves

Under the GHG Protocol, Scope 2 covers emissions from purchased electricity. Solar reduces your Scope 2 emissions in direct proportion to the electricity you generate and self-consume — every kWh generated on site and used in the business is a kWh not purchased from the grid, and therefore not included in your Scope 2 total.

For a 50 kWp system with 65% self-consumption (31,038 kWh self-consumed annually), the annual Scope 2 reduction is 7.2 tonnes of CO₂ — a meaningful and immediately reportable figure.

Solar as Part of a Broader Net Zero Strategy

Commercial solar is not a complete Net Zero solution — it addresses the electricity component of Scope 2 but does not cover gas consumption, vehicle fleet, Scope 1 or Scope 3 emissions. However, it is typically one of the largest single actions available to a business operating from a commercial property, and it delivers a financial return while doing so.

For businesses with a formal Net Zero commitment or a pathway under the Science Based Targets initiative (SBTi), solar generation is one of the most straightforward and credible actions available in the near term — measurable from day one, independently verified, and generating a financial return throughout.