A retail chain known for its friendly greeters and low prices has taken a bold step to reduce the cost of powering its famously large stores.

Retail giant Walmart has announced that 130 of its stores in California will be powered by the sun by the year 2013. According to the company, it has reduced energy costs by $1 million through its existing solar installations. Based on the success of that program, the company has decided to install solar panels on 60 additional stores. When completed, more than 75 percent of Walmart’s stores in California will have rooftop solar.

Walmart estimates the solar installations will eventually generate up to 70 million kilowatt-hours of power, providing 20 to 30 percent of each facility’s total electricity needs.