グリーンは常にクリーンか？グリーン水素の優先順位の再評価

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:再エネ配分と水素製造の排出量を比較する定量的枠組みを提供する。

🏢実務担当者:水素調達・再エネ投資の優先順位を検討する際の排出量評価に活用できる。

🏛政策担当者:水素戦略において、再エネの系統優先と水素の貯蔵用途を区別する政策設計の必要性を示す。

Hydrogen in general, and particularly green hydrogen, is recently gaining extreme popularity as a result of increased environmental awareness. Being an entirely green fuel with zero CO2 emissions, puts it forward by many, as the energy fuel of the future. Whether or not hydrogen will be the energy of the future, does not change the fact that hydrogen will play a vital role in energy transition during the next decades. Nonetheless, money doesn't grow on trees. There are many challenges still hindering the wide development and expansion of hydrogen. These challenges result not only from the high production cost of hydrogen, but also the complexity of transporting hydrogen compared to other fuels and more importantly the compatibility of hydrogen with end-user applications, which certainly needs consistent stimulation to build a solid demand for hydrogen. Despite all these challenges, being a zero-carbon fuel, robustly qualifies green hydrogen to play a pivoting role in energy transition. While it is true that green hydrogen is an emission free fuel, prioritizing green hydrogen production is not unconditionally always the right thing to do, even from a pure environmental perspective, particularly for those countries that still have room for additional renewables in their electricity mix. Many developing and underdeveloped countries still depend, to a great extent, on fossil fuels to generate electricity. Nonetheless, some of those countries that still heavily depend on fossil fuels, are publishing promising hydrogen initiatives, with significant quantities of green hydrogen, planned to be produced from off grid renewable electricity. This paper examines whether green hydrogen production from off grid renewable electricity will be more environmentally friendly compared to producing grey hydrogen. The results show that producing green hydrogen from off grid renewable electricity will indirectly result in more emissions compared to directing the same amount of renewable electricity to the electricity grid and alternatively produce grey hydrogen. Based on that, especially in regions with low renewable grid penetration—priority shall be given to directing the renewable electricity to the grid, and thus green hydrogen may best serve as a form of energy storage during off-peak demand periods. These findings highlight the importance of strategic prioritization in green hydrogen deployment to maximize climate benefits.

• semanticscholar https://doi.org/10.2118/232013-msfirst seen 2026-10-02 05:25:22