Your Costco membership can save you thousands on solar. Most Costco members know the membership saves them money on groceries, gas, and pharmaceuticals. The category that generates the most absolute dollar savings for any individual member — but that the fewest members have discovered — is the Costco Home Services solar program. On a qualifying rooftop solar installation through Costco's partnership with Sunrun, a member receives a Costco Shop Card worth 10 percent of the pre