Target’s famous bull's-eye is so cosmically linked with the brand that it’s hard to imagine the retail behemoth ever messing with the logo’s red color. But over the past decade — under pressure from customers, shareholders and employees — Target’s retail future is morphing into a very different hue: eco-green.

The Minneapolis retailer best-known for its trendy, private-label brands and its millennial-friendly prices , has very publicly embraced the renewable energy passions of its millennial-heavy consumer base and is adding rooftop solar panels to its stores to generate renewable electricity at a breathtaking pace.

Target is so serious about being viewed as a friend of the planet that by November, the company said, it will have erected rooftop solar panels on 500 of its stores in the United States. That’s more than one-quarter of its total 1,855 stores , and Target expects to reach that goal one year earlier than projected.