2012 SUSTAINABILITY REPORT Duke Energy Home | Sustainability | Annual Report | Feedback

Introduction Sustainability Plan and Approach Innovative Products and Services Environmental Footprint Quality Workforce Strong Communities Governance and Transparency

Financial strength supports sustainable growth Performance Excellence: Doing business better Supply Chain combines best practices of both companies Upholding high ethical standards Governance ratings Global Reporting Initiative About our data Forward-Looking Information Non-GAAP Financial Measures Engaged in the political arena Spending with diverse suppliers continues to grow Engaging stakeholders Partnerships and memberships Independent review Shedding a Light on Energy Issues

Governance ratings¹

We regularly benchmark our governance practices against our peers and other companies to gauge the strength of our corporate governance. Below are the risk ratings for Duke Energy provided by ISS, a leading corporate governance advisory service to the financial community.