Estimation of technology level required for low-cost renewable hydrogen production

February 1, 2019, National Institute for Materials Science
System capable of adjusting the amount of battery charge/discharge and the amount of electrolysis hydrogen production in relation to the amount of solar power generated. Comprehensive analysis of various factors, including rechargeable battery and electrolyzer capacities, enables the estimation of technology levels required for low-cost hydrogen production. Credit: NIMS

NIMS, the University of Tokyo and Hiroshima University have jointly evaluated the economic efficiency of hydrogen production systems combining photovoltaic power generation and rechargeable batteries. They also estimated technology levels necessary for the systems to produce hydrogen at a globally competitive cost. The results may provide vital guidelines for advancing intermittent renewable power generation systems as a main power source of the country.

Scientists report obstacles in the effort to increase renewable , such as unstable power generation and low annual capacity ratio. Specific examples include Japanese power companies suspending acceptance of applications from renewable energy suppliers in September 2014 and Kyushu Electric Power Company controlling output power suppression of solar power generation in October 2018. To address these issues, various organizations have been studying systems capable of storing excess electricity in rechargeable batteries and power-to-gas (P2G) systems capable of producing using and storing and supplying produced hydrogen. However, most of these systems were found to be expensive to operate, undermining the mass implementation of economically feasible power generation technology driven by domestic renewable energy.

The joint research team designed an integrated system (see figure) capable of adjusting the amount of battery charge/discharge and the amount of electrolysis hydrogen production in relation to the amount of solar power generated. The team then evaluated the economic feasibility of the system. They identified technology levels necessary for the system to produce hydrogen at low cost through a comprehensive analysis of factors including and electrolyzer capacities, while considering future technological advancements. For example, that can discharge only at a low rate but can be produced economically are expected to become available by around 2030. The team estimated that integration of these batteries will enable the system operated in Japan to produce hydrogen at a globally competitive cost of 17 to 27 yen per cubic meter.

In future studies, the team plans to determine component technology levels required for proposed systems and set R&D target values to achieve these levels. The team will also investigate the system feasibility of renewable power generation systems under output suppression control or a restricted electricity power grid connection in order to design a prototype system.

Explore further: Emissions-free hydrogen production edges closer with new pilot site in Denmark

More information: Yasunori Kikuchi et al, Battery-assisted low-cost hydrogen production from solar energy: Rational target setting for future technology systems, International Journal of Hydrogen Energy (2018). DOI: 10.1016/j.ijhydene.2018.11.119

Related Stories

Recommended for you

Archaeologists discover Incan tomb in Peru

February 16, 2019

Peruvian archaeologists discovered an Incan tomb in the north of the country where an elite member of the pre-Columbian empire was buried, one of the investigators announced Friday.

Where is the universe hiding its missing mass?

February 15, 2019

Astronomers have spent decades looking for something that sounds like it would be hard to miss: about a third of the "normal" matter in the Universe. New results from NASA's Chandra X-ray Observatory may have helped them ...

What rising seas mean for local economies

February 15, 2019

Impacts from climate change are not always easy to see. But for many local businesses in coastal communities across the United States, the evidence is right outside their doors—or in their parking lots.

The friendly extortioner takes it all

February 15, 2019

Cooperating with other people makes many things easier. However, competition is also a characteristic aspect of our society. In their struggle for contracts and positions, people have to be more successful than their competitors ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.