Reducing carbon emissions is no longer confined to a company’s own operations or electricity use. The largest climate impact for most organisations hides in the value chain. In other words, their Scope 3 emissions. In fact, Scope 3 emissions often account for 70% to 90% of a company’s total carbon footprint. These indirect emissions, from suppliers, product use, transportation, and more, are now a focal point for ESG compliance and competitive advantage.

In this comprehensive guide, we will explain what Scope 3 carbon emissions are, why they matter, and strategies to cut them. We’ll cover engaging suppliers, greening procurement and logistics, improving reporting and compliance, designing products for circularity, building an internal culture around Scope 3, and how Conexa Tech Solutions helps power-supply OEMs meet their Scope 3 goals.

What Are Scope 3 Emissions and Why Do They Matter?

Scope 3 emissions are all the indirect greenhouse gas emissions that occur in an organisation’s value chain, both upstream, from your suppliers and supply chain and downstream, from product distribution, use by customers, and end-of-life disposal. By definition, they exclude direct on-site emissions (Scope 1) and electricity or heating-related emissions (Scope 2).

According to the Greenhouse Gas Protocol, Scope 3 “includes all other indirect emissions that occur in the upstream and downstream activities of an organisation”. These are spread across 15 categories, like purchased goods, transportation, use of sold products, waste, etc., covering the full life cycle of your operations and products.

Scope 3 matters because it usually makes up the majority of a business’s carbon footprint. Measuring and addressing Scope 3 offers several benefits. Here are some of them:

Identify Hotspots

By quantifying value-chain emissions, you can pinpoint the biggest “carbon hotspots” across suppliers, materials, transportation, and product use. This helps prioritise where reduction efforts will matter most.

Cost and Efficiency Opportunities

Often, what drives emissions also drives cost. Uncovering inefficiencies can highlight cost-saving opportunities alongside carbon savings.

Supplier Comparison

Tracking suppliers’ emissions performance lets you see which partners are sustainability leaders or laggards. This data informs procurement decisions and encourages competition on climate performance.

Regulatory and ESG Compliance

Emerging regulations and ESG frameworks require Scope 3 disclosure. Companies that measure and reduce Scope 3 are better prepared for compliance and can show leadership in sustainability reporting.

Supplier Engagement and Tiered Emissions Reduction Plans

Your Scope 3 footprint is largely determined by your supplier ecosystem. For manufacturing companies, such as power-supply OEMs, metals, electronics, and plastics, often come from Tier 2 or Tier 3 suppliers operating globally, with varying maturity in carbon management. Engaging suppliers is therefore one of the most impactful strategies to reduce Scope 3 emissions.

That’s why you must always have a structured supplier engagement program that can cut your upstream emissions significantly:

Ask For Carbon Data From Suppliers

Start by requesting that suppliers measure and disclose their own carbon footprints. This might involve providing them with standardised carbon accounting templates or tools to report emissions related to the products and materials they supply. By simply beginning the conversation and asking for data, you create transparency and accountability in your supply chain

Set Expectations and Incentives

Clearly communicate that low-carbon performance is a factor in your procurement. For example, require supplier emission declarations in RFQs and include carbon criteria in supplier scorecards. You can incentivise improvement by favouring vendors with better climate performance. For example, a preferred vendor list or procurement score bonus for suppliers who cut emissions or have science-based targets.

Promote Environmental Standards

Encourage or mandate that key suppliers adopt recognised environmental management systems and targets. Certifications like ISO 14001 or programs like reporting to CDP (Carbon Disclosure Project) signal that a supplier is actively managing and reporting their emissions. You might also ask suppliers to set their own emissions reduction goals or to source renewable energy in their operations.

Collaborate on Lower-Carbon Alternatives

Work with suppliers to identify opportunities for lower-carbon materials and processes. For example, using recycled or lower-impact materials can cut emissions embedded in components. If a particular raw material or part has a high carbon footprint, engage the supplier on finding substitutes or improvements.

Not all suppliers contribute equally to your Scope 3. Prioritise engagement with the most impactful suppliers. By tiering suppliers by emissions impact, you focus your efforts where they will drive the most reduction. Start with the top 10–15 suppliers that drive the bulk of your Scope 3, then cascade requirements further down as feasible.

How to Integrate Carbon Reduction into Procurement and Logistics

Beyond design and suppliers, your procurement and logistics practices offer huge opportunities to cut Scope 3 emissions. Every purchasing decision or shipping route choice can influence your carbon footprint.

Here are strategies to integrate carbon reduction into procurement and logistics:

• Choose Low-Carbon Suppliers and Materials: Update your procurement criteria to include carbon metrics. This means assessing suppliers not just on price and quality, but also on their carbon footprint or use of renewable energy.

• Optimise Freight and Transportation: To reduce transportation emissions, aim to shift to sea or rail shipping where possible, even if it’s slower. Consolidate shipments to maximise container loads and avoid half-empty trucks. If you have factories or distribution centres, consider co-locating production near key markets or suppliers to cut travel distance.

• Green Your Logistics Network: Incorporate green logistics practices such as optimising routes and warehousing. Route planning software can consolidate deliveries and avoid backtracking, cutting fuel use.

• Embed Carbon in ERP and Decision Tools: Integrate carbon tracking into your enterprise systems. Modern procurement and ERP platforms can include fields for carbon per purchase, letting teams see the carbon impact of different sourcing options. Similarly, a transportation management system (TMS) that shows CO₂ per route or per ton shipped can guide logistics staff to make cleaner choices.

Reporting Scope 3 Progress and Preparing for Regulatory Disclosure

Global regulations are raising the bar. In Europe, the new Corporate Sustainability Reporting Directive (CSRD) will require large companies to report detailed Scope 1, 2, and 3 emissions in their annual reports, audited to EU standards. In the U.S., the SEC has proposed climate disclosure rules that would compel many firms to disclose Scope 3 if it’s material or if they have set Scope 3 targets. And in California, the landmark SB 253 law will require companies doing business in CA to publicly disclose Scope 1, 2, and 3 emissions, with Scope 3 reporting starting in 2027.

To prepare for this, you should focus on data quality and consistency in carbon accounting.
Here are some best practices for robust Scope 3 reporting:

Establish Audit-Ready Data Systems

Use a centralised carbon accounting system or software to gather all Scope 3 data with proper documentation. Many companies are adopting carbon management software that integrates with their financial or ERP systems to track emissions alongside financial data.

Report Both Absolute and Intensity Metrics

When disclosing, provide context. Report your absolute Scope 3 emissions (total tonnes CO₂e), but also an intensity metric like emissions per unit of product, per revenue, or per kW of output for a power supply.

Include Product-Level Carbon Information

Especially for manufacturing businesses, it’s valuable to calculate and share product carbon footprints. Providing this data through an Environmental Product Declaration or product carbon label helps your customers account for emissions in their own Scope 3 and can be a selling point as more companies seek low-carbon suppliers.

Third-Party Verification

Consider having your Scope 3 inventory verified by independent experts or auditors. Third-party assurance adds credibility and will likely be required under many regulations.

How Conexa Tech Solutions Helps Power-Supply OEMs Meet Scope 3 Goals

At Conexa Tech Solutions, we recognise that mid-sized manufacturers and OEMs often face unique challenges in tackling Scope 3 emissions. For power-supply OEMs in particular, our offerings and approach are aligned with enabling Scope 3 reductions in several ways:

High-Efficiency Power Products

Conexa provides a wide range of power conversion products, from AC/DC adapters to DC/DC converters and custom power systems, with a focus on high efficiency and reliability. By using the latest technologies, our products minimise energy losses during use. This directly reduces the downstream Scope 3 emissions for our customers’ products, as less electricity is wasted as heat.

Design for Sustainability

We develop modular power solutions that can be easily integrated or upgraded, which can reduce material waste over the product’s life.

Local Sourcing and Flexible Supply Chain

Conexa offers bespoke product sourcing services and has a network of trusted suppliers. We strive to source components regionally or from suppliers with strong environmental credentials whenever possible. By optimising the supply chain and even offering custom kitting/assembly locally, we help lower freight-related Scope 3 emissions for our OEM clients.

Compliance and End-of-Life Support

All Conexa power products adhere to RoHS and REACH standards and are built with safe, environmentally-conscious materials. For medical and industrial power units, we ensure regulatory compliance not just for safety, but also for energy efficiency standards (like DOE Level VI or EU Eco-design requirements for external power supplies).

Ready to tackle Scope 3 in your products and supply chain? Reach out to Conexa Tech Solutions to discover how our IoT and power experts can support your journey to lower emissions and stronger ESG performance. Together, we can power innovation and sustainability hand in hand.