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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What’s at Stake in FERC’s Large Load Proposal?

With data center demand surging, FERC’s new large load proposal could redraw the line between federal and state power—and determine how quickly the U.S. grid can absorb AI-driven demand. The outcome may reshape how megawatt-scale loads connect to the grid nationwide.

Critical Questions by Aaron Yang, Ray Cai, Joseph Majkut, and Mathias Zacarias — December 9, 2025

Experts React: Progress and Setbacks at COP30

COP30 showcased noteworthy progress while exposing persistent roadblocks in global climate diplomacy. CSIS experts react to the conference’s most significant outcomes and their implications for the future of climate, energy, health, development, and the COP process at large.

Commentary by Leslie Abrahams, Jane Nakano, Noam Unger, J. Stephen Morrison, Katherine E. Bliss, Mathias Zacarias, Ray Cai, and Alexis Burns — November 25, 2025

Audio Briefs

The United States Risks Losing Its Carbon Capture Advantage

An audio version of “⁠The United States Risks Losing its Carbon Capture Advantage⁠,” a new Commentary by CSIS’s Mathias Zacarias. This audio was generated with text-to-speech by Eleven Labs. 

Podcast Episode by Mathias Zacarias — July 28, 2025

Audio Briefs

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