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A New Toolkit for Evaluating Energy and Climate Policy

The REPEAT Project provides regular, timely, and independent environmental and economic evaluation of federal energy and climate policies as they’re proposed and enacted.

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 the Princeton ZERO Lab (Prof. Jesse D. Jenkins, PI), in partnership with Evolved Energy Research and Prof. Erin Mayfield of Dartmouth College, 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. 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. Funding for the REPEAT Project was provided by a grant from the Hewlett Foundation.

The REPEAT toolkit reflects further development and refinement of the models and methods used in the landmark Princeton Net-Zero America Study, which “set an entirely new standard” in energy transition modeling by offering an “unprecedented degree of clarity and granularity” in its results, according to John Holdren, former Science Advisor to President Obama and Director of the White House Office of Science and Technology Policy. The influential report was widely covered in major media and the spatially-explicit and granular results and associated maps have proven to be highly relevant to a wide range of stakeholders and decision makers. The impact of and reception to the Net-Zero America project indicates the desire for more politically-salient outputs from energy systems models and inspired and motivated the REPEAT Project, which aims to evolve and automate these detailed methods for timely and granular evaluation of federal policies.

Princeton University
ZERO LAB
Zero-carbon Energy Systems Research and Optimization Laboratory 

Princeton University Zero Lab

The Princeton Zero-carbon Energy systems Research and Optimization Laboratory (ZERO Lab) conducts research to improve decision-making and accelerate rapid, affordable, and effective transitions to net-zero carbon energy systems. ZERO Lab’s research focuses on improving and applying optimization-based macro-energy systems models to evaluate low-carbon energy technologies and generate insights to guide policy and planning decisions.

The REPEAT Project Team

Jesse D. Jenkins (PI)

Princeton University Zero Lab

Erin Mayfield (co-PI)

Princeton University Zero Lab

Neha Patankar

Princeton University Zero Lab

Qingyu Xu

Princeton University Zero Lab

Anna Jacobson

Princeton University Zero Lab

Ryan Jones

Evolved Energy Research

Jamil Farbes

Evolved Energy Research

Greg Schivley

Carbon Impact Consulting

Emily Leslie

Montara Mountain Energy

Andrew Pascale

Montara Mountain Energy

Claire Wayner

Princeton University Zero Lab

Aneesha Manocha

Princeton University Zero Lab

Riti Bhandarkar

Princeton University Zero Lab

Cady Feng

Princeton University Zero Lab

Evolved Energy Research

Evolved Energy Research (EER) is a research and consulting firm focused on questions posed by transforming the energy economy. Their consulting work and insight, supported by complex technical analyses of energy systems, are designed to support strategic decision-making for policymakers, stakeholders, utilities, investors, and technology companies. EER has developed models to simulate and optimize economy-wide energy systems, bulk power systems operations, and utility distribution systems.

Carbon Impact Consulting

Carbon Impact Consulting leads development of the PowerGenome open-source software project and works with clients to produce data and analysis for energy system models.

Montara Mountain Energy

Montara Mountain Energy provides technical and analytic consulting services addressing the spatial component of the decarbonization challenge. Much of our work consists of data-driven visual problem-solving, answering questions like the following: where are the best clean energy opportunities, from a technical, economic, societal and environmental perspective?

The Net Zero America Study

The Princeton Net-Zero America Study provides the most detailed and granular analysis of paths to net-zero greenhouse gas emissions in the United States. The study quantified five distinct technological pathways, all using technologies known today, by which the United States could decarbonize its entire economy. With multiple plausible and affordable pathways available, the societal conversation can now turn from “if” to “how” and focus on the choices the nation and its myriad stakeholders wish to make to shape the energy transition. Net-Zero America provides granular guidance to inform these critical choices.

Evaluate the policies

The REPEAT Project provides regular, timely, and independent environmental and economic evaluation of federal energy and climate policies as they’re proposed and enacted. Dive into the details for each of the policies analyzed by the project to date...

The Build Back Better Act, November 2021 version ('BBBA, Nov ‘21')

$301
Savings for Avg US Household
On 2030 Annual Energy Costs
2.2 Million
Net Jobs Created
In Energy Supply Related Industries
25,000
Deaths Avoided From Pollution
Through 2030

Passed by the U.S. House of Representatives on November 19, 2021, the Build Back Better Act (H.R. 5376) contains over $500 billion in tax credits, grants, rebates, and other policies to deploy clean electricity, electric vehicles, building electrification and efficiency, hydrogen, carbon capture and storage, and low-carbon transportation fuels. The bill also funds agricultural practices that could sequester carbon in soils, provides funding to fight wildfires and protect forests, and imposes a fee on upstream emissions of methane in oil and gas sectors. It remains stalled in the U.S. Senate at this time.

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