Mathias Zacarias

Associate Fellow and Energy Transitions Fellow, Energy Security and Climate Change Program
Mathias Zacarias

Mathias Zacarias is an associate fellow and energy transitions fellow in the Energy Security and Climate Change Program at the Center for Strategic and International Studies (CSIS). In this role, he covers low-carbon diplomacy and low-carbon innovation, with a focus on hydrogen, low-carbon fuels, and carbon management technologies. He also supports research on power sector decarbonization, clean energy supply chains, green industrial policy, and energy markets. Prior to joining CSIS, he worked as a graduate research assistant at the Georgia Institute of Technology, as an advocacy research volunteer at the Southface Institute, and as an intern in the CSIS Energy Security and Climate Change Program. He holds an MS and BS in civil engineering from the Georgia Institute of Technology, with minors in sustainable cities and German.

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Experts React: Energy Policy in the Reconciliation Debate

The House of Representatives released its initial budget reconciliation bill, significantly changing the energy policy landscape in the United States. In this Experts React, our team examines the most momentous, surprising, and nuanced aspects of the proposed legislation.

Commentary by Joseph Majkut, Clayton Seigle, Kyle Danish, Leslie Abrahams, Jane Nakano, Arushi Sharma Frank, and Mathias Zacarias — May 15, 2025

Audio Briefs

Experts React: Energy Policy in the Reconciliation Debate

An audio version of “⁠Experts React: Energy Policy in the Reconciliation Debate⁠⁠⁠⁠⁠,” a new commentary by CSIS's Joseph Majkut, Clayton Seigle, Kyle Danish, Leslie Abrahams, Jane Nakano, Arushi Sharma Frank, and Mathias Zacarias. This audio was generated with text-to-speech by Eleven Labs.

Podcast Episode by Joseph Majkut, Clayton Seigle, Kyle Danish, Leslie Abrahams, Jane Nakano, Arushi Sharma Frank, and Mathias Zacarias — May 15, 2025

Audio Briefs

U.S. Low-Carbon Leadership

This brief outlines an aspirational whole-of-government vision to catalyze U.S. low-carbon leadership on the global stage, drawing on insights from three opportunities to deploy U.S. innovations in three emerging markets critical to future energy systems and global emissions.

Brief by Mathias Zacarias, Ray Cai, and Joseph Majkut — March 6, 2025

Experts React: COP29 Highlights, Challenges, and Emerging Trends in Global Climate Policy

COP29 has brought heads of state, climate experts, nongovernmental organizations, and activists to Azerbaijan to assess global climate efforts and discuss opportunities for cooperation. CSIS experts react to some of the conference’s most notable highlights. 

Commentary by Jane Nakano, Noam Unger, Ray Cai, Mathias Zacarias, Wilder Alejandro Sánchez, Quill Robinson, and Zach Slotkin — November 26, 2024

Power Plays: Europe’s Response to the Energy Crisis

Russia’s full-scale invasion of Ukraine triggered an unprecedented energy crisis in Europe. While Europe emerged as a stronger energy actor and its response yielded remarkable results, challenges remain that will impact the continent’s politics and economic competitiveness for years to come.

Report by Max Bergmann, Cy McGeady, Otto Svendsen, Mathias Zacarias, and Ignacio Urbasos — September 3, 2024

Audio Briefs

What Happened to Hydrogen in the EPA’s Power Plant Rule?

An audio version of “What Happened to Hydrogen in the EPA’s Power Plant Rule?,” a new Critical Questions by CSIS’s Mathias Zacarias and Joseph Majkut. This audio was generated with text-to-speech by Eleven Labs. 

Podcast Episode by Mathias Zacarias and Joseph Majkut — June 12, 2024

Audio Briefs