Spain Begins Construction on Europe’s Largest Green Hydrogen Plant What will this mean for the future of hydrogen produced by renewables?

On September 17, 2026, Spain broke ground on what is set to be the largest green hydrogen-producing plant in all of Europe (Moeve, 2026). This exciting development comes as global investment in green hydrogen surpasses 130 billion dollars (Reuters, 2026). Green hydrogen plants are a unique form of clean energy. They use renewable energy sources to produce hydrogen gas, or H₂ (referred to as hydrogen in this article), in a process known as electrolysis. Located in Andalusia, the plant Onuba will be brought to life by Spanish sustainable energy investment company Moeve (Moeve, 2026). Onuba is set to have at least 300 MW of electrolysis capacity, a relatively large output when compared with its other existing counterparts across Europe (Moeve, 2026).

Onuba and recent developments like it are striking, given that hydrogen fuel production has been marginal compared to other alternative fuel sources since its discovery in the 1800s. Spain's plant, along with increased global investment, offer an opportunity for green hydrogen fuel production to overcome the considerable technological, political, and economic barriers that have historically made it more difficult to competitively scale the fuel’s production. For reference, in 2025, global oil and other liquid fuel production was 106.2 million barrels, or around 14 million tonnes (Mt) per day. That same year, hydrogen production amounted to only 100 Mt annually (U.S. Energy Information Administration [EIA], 2026). Reinvigorated interest from investors and governments alike in green hydrogen brings into question a crucial concern for larger-scale deployment of many technologies: will political will and increased scientific research and production capacity investment be enough to help the fuel proliferate, or are the physical and chemical limits of hydrogen properties not something that can be compensated for?

Why green hydrogen as a fuel source? 

Green hydrogen fuel has been under consideration as a cleaner alternative to fossil fuels since the 1970s as oil crises led to the creation of the International Energy Agency (IEA) that would promote alternative fuel sources like green hydrogen (Hossain Bhuiyan & Siddique, 2025). It has been an attractive option because of its less environmentally harmful qualities but also its suitability as a potential as a strategic fossil fuel alternative and as a suitable fuel for particular heavy industries.

Importantly, green hydrogen produced from electrolysis of water molecules does not create carbon dioxide emissions during its production as the energy used to separate hydrogen from water molecules is supplied by renewables. Further, when burned as a fuel source, it releases no carbon dioxide. Uniquely, hydrogen has potential to be a lower-carbon energy source for industries that have production processes that consistently demand energy to create extremely high temperatures, as well as for those that ship heavy loads (e.g. aviation, shipping, and long-haul trucking). These industries both require a significant supply of energy, and are unable to carry heavy electric batteries along with the cargo (Morillo, Thykjaer, Salido, 2026). Thus, hydrogen fuel has the capacity to aid in decarbonization under these conditions due to several of its particular properties. Notably, hydrogen has high gravimetric energy (energy it stores per unit of mass), meaning hydrogen releases more energy from the same mass than fossil fuel products or electric batteries without emitting carbon (Anekwe et al., 2025). Its ability to be compressed and stored, as well as the high temperatures it reaches when it is combusted make it more reliable than other alternatives currently available for industrial processes that need a consistent energy supply (Anekwe et al., 2025). 

Interest in green hydrogen may have originated from its intrinsic qualities as a lower emissions fuel source, but heightened attention has arisen out of a global desire to diversify energy consumption sources for the sake of stability and insulation against the volatility of geopolitically sensitive markets like oil and gas (IEA, 2026). In the case of Onuba, the Spanish prime minister commented that the country's goal “is to provide investment certainty, expand supply, and facilitate the development of industrial projects across the country.” (Moeve, 2026). Moeve, the company behind the project, is focused on propelling a transition to lower-emission fuel production and supporting infrastructure in Europe, adding that they view a transition to cleaner energy sources like green hydrogen not “as a cost to industry, but as an opportunity to make it stronger” (Moeve, 2026). Framing increased green hydrogen production in terms of energy security, decarbonization, innovation, and investment stability for Spain appears to be a key underlying political and economic driver of projects like Onuba. 

Onubas Impact on Green Hydrogen 

With their newly underway plant in Andalusia, Spain has stepped up in coalition with private companies and the rest of the EU to address some of the shortcomings of the hydrogen industry and keep pushing to successfully scale up green hydrogen production in Europe. 

The project Onuba is supported by an investment of 304 million euros from the Spanish government under the EU's recovery, transformation, and resilience plan through NextGenerationEU (Moeve, 2026). The main private actor, Moeve, will have the majority 51% stake in the project that includes not only the green hydrogen plant but also a biofuels facility that will make up the Andalusian Green Hydrogen Valley. COFIDES, a Spanish public finance institution, will have a 29% stake, while the remaining stake will be held by renewable electricity developing companies (Moeve, 2026). With private investment and both national and international support, this project will play a role in revealing the impacts of stimulus from the private and public sectors on the effectiveness and scalability of green hydrogen production. The funding from Spain can aid producers in overcoming expensive initial costs to set up production facilities, as well as the absence of transport infrastructure for hydrogen in Europe. Additionally, avoiding emissions in any sector should be celebrated: once in operation, Onuba is estimated to remove 250,000 tonnes of carbon dioxide emissions each year (Moeve, 2026). While scalability is still in development, providing greener hydrogen to companies using it as input promotes substantial emissions avoidance and can leave the door open for further exploration of hydrogen as a fuel source for industries struggling to decarbonize. 

Uncertainty in the price of petroleum products has intensified desires to turn to decarbonized fuels, including green hydrogen (Reuters, 2026). While the idea has existed for decades, whether energy security concerns will suffice to galvanize the widespread production and consumption of green hydrogen as a fuel and raw material remains to be seen. As research and development receives more resources, the science policy interface will determine if the greatest limit for green hydrogen is underfunding in capacity building or if its physical and chemical properties are the ultimate challenge to its scaling.

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Reference

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Moeve. (2026, September 17). Moeve launches construction of the first phase of Europe’s largest green hydrogen project. https://www.moeveglobal.com/en/press/moeve-launches-largest-green-hydrogen-project-andalusian-valley

Muñoz Morillo, M., Thykjaer, C., & Salido, R. (2026, September 17). Spain vying to become European leader in green hydrogen with €1 billion project led by Moeve. Euronews. https://www.euronews.com/2026/09/17/moeve-starts-building-europes-largest-green-hydrogen-project-in-huelva

Reuters. (2026, September 10). Global clean hydrogen investment tops $130 billion amid energy security push, council says. https://www.reuters.com/business/energy/global-clean-hydrogen-investment-tops-130-billion-amid-energy-security-push-2026-09-10/

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