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OpenEI is a web-based system that enables widespread sharing of energy information, including data, tools, models, and other digital resources. It was launched by the United States Department of Energy on December 9, 2009. It has subsequently been named as a "flagship initiative" in the Department's Open Government Initiative plan, and has been listed as a "featured innovation" on Several high-profile individuals have commented on OpenEI, including Dr. Steven Chu, Tim Berners-Lee, and Tim O'Reilly.

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