I'm speculating that GM will have solar panels rooftop or park at its manufacturing plants to supplement electricity usage!
Past Solar Projects that GM had: 1) GM Solar Roof, Zaragoza Spain • 2 Million Square Feet • 85,000 Solar Panels • 12 Megawatt • 15 Million Kilowatts of Power Annually • Equivalent Power for 1,500 Homes
2) GM Solar Roof, Rancho Cucamonga, CA • First Public Project Over 1 Megawatt • 180,000 Square Feet • Provides 50% of Facility Power