Walmart announced recently that it has reached an agreement with SunPower to have the commercial energy provider install solar systems at 19 stores and two distribution centers in Illinois. The combined rooftop and ground-mount solar systems are expected to account for 23 megawatts.

Walmart has announced a goal for 2025 of supplying its global operations with 50 percent renewable energy.

"Solar is a vital component of Walmart’s expanding renewable energy portfolio," Mark Vanderhelm, vice president of energy for Walmart, said in a statement. "Walmart plans to tirelessly pursue renewable energy projects that are right for our customers, our business and the environment."

Walmart is financing the solar projects through a power-purchase agreement (PPA) arranged by SunPower, allowing Walmart to buy power at competitive prices and hedge against future utility rate increases with no upfront capital costs. Walmart will own the renewable energy credits associated with the system.