Judging from news coming out of California, the world’s largest retailer is continuing to notch up solar energy successes. Two weeks ago, we reported on Wal-Mart’s completion of three new Caliofrnia solar installations in Paramount, Baldwin Park and Highland. Today, via the Los Angeles Times, comes news of a fourth project, brought online this week at the company’s distribution center in Apple Valley.

Comprised of more than 5,300 solar photovoltaic (PV) panels and covering nearly seven acres, Wal-Mart’s latest installation has a generation capacity of one megawatt — the equivalent amount needed to power about 175 homes. The Apple Valley solar project is the company’s largest to date.

Since announcing its solar initiative in May 2007, Wal-Mart has been adding solar installations to its retail locations and operations facilities. Last year, for example, Wal-Mart Puerto Rico broke ground on a 895-kilowatt system in Caguas, PR. The solar initiative was updated in 2009, calling for 10 to 20 solar projects to be completed in California over 18 months.