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Although renewable energy (excluding hydropower) is a relatively small portion of total energy supply both globally and in the United States, renewable energy installations in both the world and in the United States have nearly tripled between 2000 and 2008. Key Findings, continued • Worldwide, wind energy is the fastest growing renewable energy technology-between 2000 and 2008, wind energy generation worldwide increased by a factor of almost 7. The United States experienced even more dramatic growth, as installed wind energy capacity increased almost 10 times between 2000 and 2008. • In the United States, renewable energy has been capturing a growing percent of new capacity additions during the past few years. In 2008, renewable energy accounted for more than 43% of all new grid-connected electrical capacity installations in the United States-a large contrast from 2004 when all renewable energy captured only 2% of new capacity additions.

The North American Renewable Integration Study (NARIS) was a multiyear, international effort on which many institutions collaborated and to which many individuals contributed. We would like to thank everyone who was involved in the study.Members of the NARIS Technical Review Committee-which included experts representing approximately 50 utilities, grid system operators, and industry organizations throughout North America-helped guide the study assumptions, data, and methodologies to address relevant questions. Although the committee members helped review the report, it might not reflect the specific views or interpretations of any member of the committee or their institution. We would like to thank everyone who attended committee meetings (in person and virtual) or provided guidance during the study process, including those who provided specific comments on this report.

The North American Renewable Integration Study (NARIS) was a multiyear, international effort on which many institutions collaborated and to which many individuals contributed. We would like to thank everyone who was involved in the study.Members of the NARIS Technical Review Committee-which included experts representing approximately 50 utilities, grid system operators, and industry organizations throughout North America-helped guide the study assumptions, data, and methodologies to address relevant questions. Although the committee members helped review the report, it might not reflect the specific views or interpretations of any member of the committee or their institution. We would like to thank everyone who attended committee meetings (in person and virtual) or provided guidance during the study process, including those who provided specific comments on this report.Natural Resources Canada organized a NARIS Stakeholder Committee of interested parties from industry groups, academia, and nonprofits. These stakeholders also helped review and guide the study throughout the project, and they provided a valuable and different perspective. Thanks to all who participated on this committee or provided specific comments on this report.

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