From Congressional legislation to proposed regulations and executive actions, the REPEAT Project provides a detailed look at the United States’ evolving policy environment and the country’s progress on the road to net-zero greenhouse gas emissions.

Led by Princeton University Prof. Jesse D. Jenkins, the REPEAT Project is a joint project of the Princeton University ZERO Lab (Zero-carbon Energy Systems Research & Optimization Laboratory) and Evolved Energy Research. Funding for the REPEAT Project is provided by the Hewlett Foundation.

Since 2021, REPEAT Project has played a central role in informing debate, media coverage, and public understanding of the impacts of proposed and enacted legislation and regulatory changes. The project continues to provide regular analysis of pending and finalized changes in federal energy and climate policy, impacts on the U.S. energy sector and economy, updates on progress towards climate goals, and other analysis at repeatproject.org.

The REPEAT Project employs a suite of geospatial planning and analysis tools coupled with detailed macro-energy system optimization models capable of rapidly evaluating policy and regulatory proposals at politically-relevant spatial resolutions (e.g., state, county, and sometimes finer resolutions). This includes evaluation of candidate sites for wind and solar development, thermal power plant siting and repowering, and transmission expansion as well as the impacts of the nation’s energy infrastructure on air quality and public health, and changes in energy sector employment. This is a refinement of methods used in the landmark Princeton Net-Zero America study.

Results and publications are intended to provide independent, timely, and credible information and analysis for broad educational purposes, including as a resource for stakeholders, decision-makers, and the media.