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Contributor
Mary Burce Warlick
Deputy Executive Director. Mary Burce Warlick is the Deputy Executive Director of the International Energy Agency (IEA). A retired career diplomat and former U.S. Ambassador to Serbia, Ms. Warlick has held a variety of senior leadership positions at the U.S. Department of State, National Security Council and Department of Defense, serving in Washington and abroad. From 2014-2017 she served as the State Department’s Principal Deputy and Acting Special Envoy for International Energy Affairs and represented the U.S. on the IEA Governing Board Ms. Warlick holds a B.A. in Political Science and an M.A. in Law and Diplomacy.
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Contributor
Andrew O'Callaghan
Senior Policy and Programme Evaluator, Sustainable Energy Authority of Ireland (SEAI). Andrew O’Callaghan is a Senior Policy and Programme Evaluator at the Sustainable Energy Authority of Ireland (SEAI). He works on developing evidence and data models to assess the impact of national retrofit and energy efficiency programmes. Andrew has a background in applied psychology and carbon management, and has previously worked in behavioural economics and energy modelling. His work supports the design of more effective and inclusive policies to advance Ireland’s climate and energy goals.
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Fuel report
Sep 2025
Global Hydrogen Review 2025 Five key questions about hydrogen
Is the slow progress of projects derailing the hydrogen sector? Recent headlines reporting project delays, cancellations and downward revisions of ambitions for the adoption of low-emissions hydrogen, have led many to question whether the industry has hit another “hype cycle” like those in the 1970s, 1990s, and early 2000s. However, a deeper analysis reveals a different story. Despite falling short of the ambitious targets from the early 2020s, the sector is achieving remarkable milestones that demonstrate clear progress.The scale of electrolyser projects is growing fast. In 2021, the world's largest reached 30 MW. In 2025, a 500 MW project…
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