Harnessing Hydrogen to Realize a Carbonfree Society
Hydrogen is garnering attention as a crucial energy resource in achieving carbon neutrality since it does not emit carbon dioxide (CO2) when combusted as an energy source. As a global pioneer in utilizing hydrogen, Japan is striving to achieve decarbonization by further promoting hydrogen energy.
With the effects of global warming– induced climate change becoming an increasing threat, many countries and regions are accelerating their efforts toward carbon neutrality for the sake of sustainable development. One of the keys identified for realizing the important goal of achieving carbon neutrality is energy produced through hydrogen, the combustion of which produces no CO2 emissions. In the Green Growth Strategy, formulated by former Japanese Prime Minister Suga Yoshihide in response to Japan’s pledge to tackle global warming by becoming carbon neutral by 2050, utilization of hydrogen energy was positioned as one of the top priorities. Up to 370 billion yen (more than $3 billion) of Japan’s 2 trillion yen fund to support the development of decarbonization technology has been allotted to hydrogen projects.
In addition to producing no CO2 when combusted, hydrogen’s advantage is that it offers various energy applications, including power generation and heating. The government of Japan has been an early mover in the field, drawing up a hydrogen utilization roadmap in 2014 and instituting the Basic Hydrogen Strategy in 2017, the first of its kind in the world. Japan has also backed the development of fuel cells, which generate electricity and heat by combining hydrogen with oxygen. In 2014, Toyota Motor Corporation released the Mirai, the world’s first mass-produced fuel cell vehicle. Further development will produce synthetic fuels for use in aircraft and maritime vessels that are made by reacting hydrogen with CO2 captured from factories and elsewhere.
Although hydrogen is rarely found naturally on Earth as an isolated element, it can be produced from various raw materials. One method is to generate hydrogen from fossil fuels and to capture the CO2 released as a byproduct. Another is to use renewable energy to extract hydrogen from water through electrolysis. In addition, since liquefying hydrogen through ultralow temperatures (below minus 253 degrees Celsius [minus 423.4 degrees Fahrenheit]) reduces its volume, enabling compact storage and transportation, renewable energy could be widely distributed if kept in liquefied form.
Kashiwagi Takao, a leading researcher on energy systems and the chairperson of the Council for a Strategy for Hydrogen and Fuel Cells (established by Japan’s Ministry of Economy, Trade and Industry), has been
involved in Japan’s hydrogen policymaking for many years. Explained Kashiwagi, “It’s essential to make the widespread shift to hydrogen by 2030, but to decarbonize thereafter, we need cleaner hydrogen produced from renewable energy. At present, however, producing such hydrogen tends to be expensive, and the issue is how to reduce its cost. Having acted early to utilize hydrogen, Japan has the technical prowess to create solutions to this problem.”
One possibility is the development of an international hydrogen supply chain. The Suiso
Frontier, the world’s first liquid hydrogen carrier, was completed in 2021 by Kawasaki Heavy Industries, Ltd. The company is now conducting a verification test in which hydrogen—produced in Australia from the country’s affordable and abundant lignite (brown coal) with carbon capture and storage technology—is liquefied and then carried to the port of Kobe, Japan. With hydrogen's ability to be transported by sea, places that can generate large amounts of affordable renewable energy have the potential to supply hydrogen for shipment across the globe. The use of hydrogen in sectors such as transport, industry and power generation will contribute to decarbonization.
Meanwhile, Kashiwagi said that community-level approaches to steadily promoting the local production and consumption of hydrogen are also vital to accelerating the creation of a hydrogen-based society. The town of Namie in Fukushima Prefecture, for example, uses solar power to produce hydrogen in a pilot project to provide electricity to households in the area.
“No country can build a hydrogen society by itself,” Kashiwagi said. “Japan will work with the international community to build a global society that can enjoy the benefits of hydrogen energy, thereby contributing to the achievement of carbon neutrality around the world.”