ESG Assessment: How Suppliers Can Respond to Customer Sustainability Requests

If a major customer has suddenly asked your company for sustainability data, energy consumption numbers, or an ESG policy, you are not alone.

For most businesses, an ESG assessment starts the same way. A large client asks for information, often through a portal or a sustainability questionnaire, and the internal scramble begins. The owner hears about it from sales. Procurement gets looped in. Finance starts asking questions. HR is suddenly searching for policies that may not exist yet.

This is not random. It is supply chain pressure, and it is now part of doing business.

Let’s walk through what an assessment really means, why customers are asking for it, and how you can respond strategically without panic.

Case Study: GM’s Supplier ESG Pledge

GM is leading the charge towards a more sustainable supply chain. In 2020, they launched their “Sustainability in Supply Chain” initiative, setting out their expectations for suppliers across various ESG dimensions.

Now, let’s talk about what this means for suppliers in Canada’s automotive industry. By signing GM’s Supplier ESG Pledge, suppliers are strapping themselves in for an exciting ride. It’s like they’re putting on their spacesuits and saying, “Count me in!”

Getting on board with ESG requirements can have some stellar benefits for suppliers. First off, it boosts their reputation and makes them the cool kids of the industry. Other companies looking for sustainable partners will be like, “Hey, we want to go on a space adventure with you!” It’s a chance to shine and show off their commitment to sustainability.

But there’s more! Embracing ESG requirements can spark innovation among suppliers. Just like astronauts inventing new gadgets to survive in space, suppliers may need to come up with new technologies and processes to meet GM’s expectations. This innovation can give suppliers a competitive edge, making them the Neil Armstrongs of the automotive industry.

GM isn’t the only astronaut on this mission. Harley-Davidson and Toyota are also floating around in space, setting their own ESG requirements for suppliers. So, suppliers in Canada’s automotive industry better be ready to meet the galactic standards set by these cosmic explorers.

Why Customers Are Asking for an ESG Assessment

Across global supply chains, large organizations are pushing sustainability requirements down to their tier one and tier two suppliers. If you want to stay in their supply chain, you need to show that your company understands its environmental and social impact.

You may have seen requests like:

• Please share your energy consumption data.
• What are your Scope 1 greenhouse gas emissions?
• Do you have an environmental policy?
• Can you submit your EcoVadis rating?
• Please complete this sustainability assessment questionnaire.

For many companies, this is the first time they have ever been asked these questions. It can feel overwhelming. But from a procurement perspective, this is about risk management and revenue protection.

Sustainability is now part of how suppliers are evaluated and scored.

What an ESG Assessment Includes

This type of assessment evaluates your company’s performance across environmental, social, and governance areas.

On the environmental side, customers often want to see energy consumption for your facilities. If you have company vehicles, they may want fuel usage. This data is used to calculate Scope 1 and Scope 2 greenhouse gas emissions by applying standard emissions factors. Some companies are also being asked about Scope 3 emissions, which are often the largest source of impact.

Most businesses begin by choosing a baseline year and pulling 12 months of data. That becomes the foundation for tracking and improvement.

On the social side, customers may ask about labor practices, health and safety policies, and whether you have a child labor policy in place. They may also request information about employee benefits and workforce data.

On the governance side, they want to see structure. Do you have clear policies? Are responsibilities defined? Do you manage risks in your own supply chain?

This is not about perfection. It is about transparency and documentation.

Common Portals and Questionnaires Suppliers Encounter

Customers may require you to submit information through recognized sustainability platforms as part of your assessment. These commonly include:

• EcoVadis: A supplier sustainability rating platform where you submit documentation and receive a score or medal rating based on your environmental, labor, ethics, and procurement performance.
• CDP: A global disclosure platform focused on climate, water, and environmental impact reporting. Many large organizations require suppliers to respond to CDP questionnaires.
• Science Based Targets initiative (SBTi): This initiative validates science-based emissions reduction targets and may require suppliers to commit to measurable climate goals.

In other cases, you may receive a Sustainability Assessment Questionnaire directly from your customer. This can range from a simple Excel spreadsheet to a detailed multi-page portal submission requesting energy data, greenhouse gas emissions, policies, and targets.

These platforms allow your customer to evaluate risk, compare suppliers, and make procurement decisions based on structured ESG data. Completing them accurately and on time is often critical to maintaining preferred supplier status.

The Risk of Ignoring an ESG Assessment

It may be tempting to ignore these requests, especially if sustainability has never been part of your operations before.

You might delay for a few months. You might push back once.

But eventually, leverage disappears.

Companies have lost major clients because they chose not to meet sustainability requirements. Others were not invited to bid again because a competitor had stronger documentation or a recognized rating.

Sustainability is now part of procurement scoring. Losing preferred supplier status can happen quietly, but the revenue impact is significant.

What Customers Are Actually Looking For

Customers are not looking for a green logo on your website. They are not expecting perfection.

They are looking for four main things.

First, data. Clear energy numbers. Fuel use. Emissions calculations. Workforce metrics.

Second, policies. Environmental policies, child labor policies, health and safety standards, and codes of conduct.

Third, actions. What are you doing to reduce energy consumption or waste? Have you made equipment upgrades? Are you tracking improvements?

Fourth, targets. It is not enough to say you plan to reach net zero by 2050. Customers want to understand how you plan to get there and whether you have measurable goals.

Structure, clarity, and honesty go a long way.

We are approved consultants & Partners,
with a Platinum Ecovadis Rating

How to Respond Strategically

The smartest response to an ESG assessment request is not panic. It is structure.

Start by assessing the gaps. Identify what data you already have and what is missing. Determine which policies need to be drafted or updated.

Next, organize your data. Pull 12 months of energy and fuel information. Establish a baseline year. Document employee and safety metrics.

Then, write the missing policies. Even service-based companies need environmental and social policies. Keep them realistic and aligned with how your business actually operates.

Submit your information clearly and on time. Provide documentation where required. Avoid overcomplicating responses.

Finally, improve year over year. An assessment is not a one-time exercise. Continuous improvement strengthens your position in the supply chain.

Why ESG Assessments Protect Revenue

Sustainability is not a corporate social responsibility side project. For many suppliers, it is revenue protection.

If a customer is asking for your sustainability information, it means you matter to them. They want to keep you in their supply chain, but they need assurance that you understand and manage your risks.

When done well, an assessment can become a competitive advantage. It strengthens relationships with existing clients, improves your chances of winning new business, and can even uncover cost savings through energy reduction and efficiency improvements.

The most important lesson is this. If you have been asked for sustainability information, treat it as a signal. Your customer is telling you what they need from you in order to continue working together.

The question is whether you are ready to respond.

Ready to Respond with Confidence?

If your company has received a sustainability questionnaire, EcoVadis request, or ESG data portal submission, this is not something to ignore. It is a signal that you matter in your customer’s supply chain.

We help suppliers organize their data, develop clear policies, complete ESG assessments, and submit confidently so they protect revenue and maintain preferred supplier status.

Book a free 15-minute introductory call with Lindsay at This Rock and start building an assessment process that keeps you competitive and positioned for long-term growth.

FAQs About Supplier Requirements