Senior Consultant
Gabe Mantegna

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Gabe Mantegna

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Gabe Mantegna joined E3 in 2019 as a Consultant in the Climate Pathways group, where his work focuses on modeling and analyzing policies to achieve steep, long-term, economy-wide emissions reductions on behalf of public and private sector clients. He is passionate about both understanding the technical details of our energy system and communicating those details clearly through writing and data visualization.

Prior to E3, Gabe worked as an R&D engineer at Manta Biofuel, a startup developing a renewable biofuel made from algae. While there, he helped improve the company’s core algae harvesting technology and co-wrote a successful application for a $1 million U.S. Department of Energy grant.

Gabe was drawn to energy by the many ways in which it influences society’s interactions with the natural world, and by the extraordinary challenge of powering the world sustainably. Originally attracted to E3 by the impact of its projects – for example, its analysis supporting California’s climate and energy policies – Gabe now helps multiple state governments plan for ambitious emissions reduction goals.

In his free time, Gabe enjoys outdoor activities such as skiing, rock climbing, and biking. He also enjoys photography and filmmaking.

Education: BS, environmental engineering, Johns Hopkins University


WRI United States Decarbonization Scenarios | World Resources Institute, 2021

E3 worked with the World Resources Institute (WRI) to develop four scenarios of increasing ambition to reduce greenhouse gas (GHG) emissions across all sectors of the United States economy using E3’s US PATHWAYS and RESOLVE models. E3 collaborated with WRI to develop robust scenario definitions, collect publicly available data and assumptions, and create interactive spreadsheet results. The goal of the study was to understand the effect of high-impact federal policies on achieving 50% emissions reduction by 2030 and net-zero emissions by 2050. The analysis demonstrates the importance of key near-term building blocks, including: 1) aligning economics for customers and companies to adopt clean energy technologies; 2) aligning policy and institutions to remove barriers to technology deployment; 3) increasing consumer awareness and education to unlock higher levels of adoption; and 4) creating a transition plan for fossil fuel jobs to ensure a smooth transition.

Read the detailed project description.

Cost and Emissions Impacts of Residential Building Electrification in California | Three Utility Study, 2018-19

E3 was retained by three of California’s largest electric utilities – Southern California Edison (SCE), Sacramento Municipal Utility District (SMUD), and the Los Angeles Department of Water and Power (LADWP) – to explore the consumer costs and emissions reduction potential associated with the electrification of California homes. The study examines costs, savings, and emissions for electric and gas appliances in six different home types in geographical areas covering over half the state’s population. Unlike prior studies, it closely evaluates the consumer cost perspective on building electrification and quantifies GHG emissions savings by home type. E3 found that building electrification would deliver lifecycle cost savings for most home types in the study area. For homes with air conditioning – about 80 percent of the total – the economics are particularly strong: all new construction homes and the vast majority (84 percent) of existing single-family homes with A/C would save by going all-electric. E3 also found that electrification would significantly reduce greenhouse gas emissions from homes – starting today. For example, a Sacramento home built in the 1990s would immediately cut its GHG emissions nearly in half by switching to all-electric appliances; by 2050, with a significantly cleaner electric grid, the GHG savings would grow to over 80 percent (and more, if California achieves carbon neutrality).