Wal-Mart Stores Inc. has launched a program to test solar power at some of its operations in California and Hawaii.

Wal-Mart Stores Inc. has launched a program to test solar power at some of its operations in California and Hawaii. The company is said to be purchasing solar power equipment from BP Solar, SunEdison LLC, and PowerLight, a subsidiary of SunPower Corp. The equipment will be installed in 22 locations.

Wal-Mart has already opened two Supercenters designed to use 20 percent less energy - they use natural light whenever possible, and employ energy-saving heating and cooling systems and construction materials.