The world’s largest enterprises are realizing the benefits of renewable energy, motivating many top-tier companies to set up voluntary corporate renewable energy programs that scale up their use of on-site solar and wind power systems. Many factors have influenced Fortune 500 companies and other leading enterprises to adopt these targets, including an attractive economic return on investment, the worsening effects of climate change, and a deep concern from their customer base about environmental sustainability. Corporations are fighting to bring about public policy that facilitates renewable energy installations on commercial buildings. Twenty-four companies from the Fortune 100 and Global Fortune 100 have set specific targets for percentage of renewable energy generated, capacity (MW) or level of investment in renewable energy for their own operations.