Walmart has signed a long-term power purchase agreement with Constellation Energy to secure up to 176 megawatts of nuclear-generated electricity for its Illinois operations, beginning in 2029. The deal spans two 15-year terms and supports both a major Joliet distribution center and multiple retail stores. It advances Walmart’s goal of 100% zero-emission electricity by 2035 and avoids ~85,000 metric tons of CO₂ annually. Constellation, the largest U.S. nuclear operator, supplies 20% of the nation’s carbon-free power. The agreement reflects a growing trend among major retailers to procure firm clean energy for logistics infrastructure.
According to www.supplychaindive.com, Walmart has entered a long-term power purchase agreement (PPA) with Constellation Energy to procure nuclear-generated electricity for its operations in Illinois.
Nuclear PPA covers warehouse and retail sites
The agreement, announced in a June 23, 2026 press release from Constellation Energy, will supply Walmart with up to 176 megawatts of emissions-free nuclear power. This capacity will support not only the retailer’s newly constructed distribution center in Joliet, Illinois, but also multiple Walmart stores across the state.
The PPA is structured across two consecutive 15-year terms, with the first phase commencing in 2029 and the second beginning in 2030. Under the deal, Walmart secures not only electricity generation but also associated environmental attributes and energy capacity rights—key components for meeting its science-based climate targets.
Strategic alignment with decarbonization goals
The move directly supports Walmart’s public commitment to source 100% of its electricity from renewable and zero-emission sources by 2035. Nuclear energy qualifies under the company’s definition of zero-emission power, as confirmed in its latest ESG reporting framework. Unlike intermittent renewables, nuclear provides baseload reliability—a critical factor for powering high-demand logistics infrastructure such as automated sorting systems, refrigeration, and lighting in large-scale warehouses.
According to the report, the Joliet facility alone consumes an estimated 120 GWh annually—equivalent to the average yearly electricity use of over 11,000 U.S. homes. Integrating nuclear power eliminates approximately 85,000 metric tons of CO₂-equivalent emissions per year from that site alone, based on regional grid emission factors.
Constellation’s role and broader industry context
Constellation Energy, the largest operator of nuclear power plants in the United States, supplies roughly 20% of the nation’s carbon-free electricity. The company operates 21 reactors across 12 sites, including the Byron and Klein Creek nuclear stations in Illinois—both potential sources for Walmart’s contracted output.
This deal follows similar corporate PPAs signed by Amazon, Meta, and Microsoft in recent years. Notably, Amazon secured 1.2 gigawatts of nuclear capacity through agreements with Constellation and other providers between 2023 and 2025. Walmart’s 176 MW commitment represents one of the largest single nuclear PPAs signed by a U.S. retailer to date.
Lamar Johnson, reporter for Supply Chain Dive, noted:
“This isn’t just about green branding—it’s about grid stability, cost predictability, and securing long-term energy access for mission-critical infrastructure.” — Lamar Johnson, Reporter, Supply Chain Dive
Implications for supply chain professionals
For supply chain practitioners, the agreement signals a shift toward direct procurement of firm, dispatchable clean power—particularly for energy-intensive assets like regional distribution centers and cold-storage hubs. Unlike solar or wind PPAs that require backup generation or storage, nuclear contracts offer fixed-price, 24/7 capacity without curtailment risk.
The 15-year term length also introduces new financial modeling considerations: supply chain teams must now collaborate closely with treasury and sustainability functions to assess levelized cost of energy (LCOE), hedge against inflation-linked escalators, and integrate capacity rights into facility-level energy management systems. As more retailers follow suit, third-party energy procurement specialists report rising demand for nuclear PPA advisory services—up 40% year-over-year among Fortune 500 logistics users, per data from the ESG Dive 2026 Corporate Energy Procurement Survey.
Source: Supply Chain Dive
Compiled from international media by the SCI.AI editorial team.
