"Greenpeace assesses companies based only on their public information and practice to ensure the ranking is transparent. Companies can be held publicly accountable when they do make commitments. Making changes public also helps drive competition between the companies. The only criterion where nonpublic information is accepted is on advocacy, where a company may have voiced a clear position to relevant decision makers but does not make this public.

A clean electricity plan evaluates the company’s implementation plan for achieving its green-house gas commitments through energy efficiency and renewable energy investment and deployment. Full points go to companies with proof of a comprehensive clean energy plan, with a goal and strategy to reach 100 percent of their own operations electricity demand through the use of renewable energy."