What Walmart Project Gigaton Actually Requires From You
If you're a Walmart supplier and you haven't filed your Project Gigaton commitment yet, your account manager has probably already sent you a reminder. Or two. Walmart launched Gigaton in 2017 with a goal of avoiding 1 billion metric tons of greenhouse gas emissions from its value chain by 2030. In 2025, they tightened the screws: strategic suppliers are now expected to have an active Gigaton commitment on file — not just sign up, but actually track and report progress annually.
Here's what that means in practice for a mid-market food or consumer goods supplier.
The Five Gigaton Pillars (and Which One Catches Most Suppliers Off Guard)
Walmart organizes emissions reduction actions across five pillars:
- Energy — switching to renewable electricity, improving efficiency in manufacturing
- Agriculture — reducing fertilizer use, improving soil health, precision agriculture
- Waste — diverting food waste from landfill, eliminating single-use packaging
- Forests — deforestation-free supply chains for soy, palm oil, beef, wood pulp
- Product use & design — reducing emissions from consumers using your products
Most suppliers focus on Energy because it's quantifiable and within direct control. The pillar that surprises people is Product use & design — Walmart increasingly wants to see you thinking about the lifecycle emissions of your actual products, not just your factory floor.
Submission Deadlines for 2026
Walmart's annual reporting cycle runs on a fiscal year basis. For 2026, strategic suppliers should plan to submit updated Gigaton progress by Q3 2026 (August–September). New commitments for FY2026–2027 targets should be filed by Q1 of your reporting year. Check your specific category buyer for exact dates — grocery and apparel run slightly different calendars.
Missing a cycle doesn't automatically trigger delisting, but two missed cycles in a row puts you on a watch list. Procurement buyers do use Gigaton compliance status in shelf-reset negotiations.
What Data You Need to Gather
To submit, you'll need:
- Base year emissions (typically 2019 or the year you set your baseline)
- Most recent year actuals for each pillar you're reporting on
- Projected target year (most suppliers set 2025 or 2030 targets)
- Methodology documentation — how did you calculate your numbers?
The methodology piece is where most first-time submitters get stuck. Walmart accepts GHG Protocol-aligned calculations. If you've been tracking your QuickBooks spend data, you can map energy purchases, freight invoices, and materials sourcing to Scope 1/2/3 emissions using spend-based emission factors.
The Fastest Path to a Compliant Submission
The submission form itself lives in Walmart's Supplier Center under the Sustainability tab. The actual hard work is the data gathering and calculation that precedes it. Most suppliers spend 80% of their time pulling together the numbers and 20% actually filling in the form.
If your finance team exports QuickBooks data as a CSV, you can get a full Scope 3 breakdown by category — energy, freight, materials — in minutes using automated categorization tools. Once you have that breakdown, plugging into Gigaton's format is straightforward.
Emissa imports your QuickBooks data and generates a Gigaton-formatted report automatically. Upload once, get the numbers you need for submission.
What Happens If You Don't Submit
Short term: a conversation with your category buyer about why you're behind. Medium term: lower Supplier Performance Index scores. Long term: reduced shelf allocation or exclusion from new item reviews. Walmart is explicit that sustainability performance is a factor in supplier evaluation. They've removed brands from shelves for compliance gaps before — not just for sustainability, but it's on the scorecard.
The good news: Walmart isn't expecting perfection. They want to see direction — a commitment with a target, progress toward it, and honest accounting. A supplier who shows 8% reduction from baseline is in better standing than one who submits nothing.