Hydrogen, first on the periodic table of elements, is the lightest and most widespread chemical element in the universe.
For centuries now, scientists and scholars have taken an interest in hydrogen, both its production and its use as an energy source. So why the sudden craze for hydrogen?
This update explains not only the attributes that could make hydrogen the power source of choice for the future, but also the challenges that hydrogen will need to overcome to achieve this status.
As a fuel, hydrogen is a clean power source: its combustion produces no CO2 emissions, only water vapour.
Some methods used to produce hydrogen do, however, generate significant emissions.
Hydrogen is a major source of carbon emissions if it is produced using natural gas reformation or the gasification of hydrocarbons like coal. In fact, hydrogen produced in this manner is called grey hydrogen. Other methods that can capture these carbon emissions produce a “cleaner” fuel referred to as blue hydrogen. Recent technological innovations can be used to produce green hydrogen, i.e., hydrogen produced by electrolyzing water using a renewable energy source.
The water electrolysis process is fairly simple: a water molecule (H2O) is subjected to an electric current by means of two electrodes in order to separate the oxygen (O) and dihydrogen (H2) molecules.
Using a renewable energy source to power the electrolyzer ensures the production is “green.” Today’s craze isn’t so much for hydrogen as it is for green hydrogen. Only problem is, less than 2% of the hydrogen produced worldwide is green.
Transport and Storage
When its applications and uses are destined to take place far from its production site, hydrogen must be compressed or liquefied (using electricity), making storage and long-haul transportation complex and costly. Hydrogen can generally be transported in four forms: compressed hydrogen, ammonia, liquefied hydrogen, and in liquid organic hydrogen carriers (LOHC) such as naphthalene or benzene. Depending on its form, hydrogen can be transported by tank (truck, ship and train), gas pipeline or in bottles. The natural gas pipeline network’s existing infrastructure can also be used to transport hydrogen by mixing the fuel in with the natural gas.
The compression and liquefaction required to transport and store hydrogen are energy intensive, respectively taking up to 15% and 35% of the hydrogen’s original energy content. The power needed to perform these operations (power that might come from non-renewable sources) could therefore adversely affect hydrogen’s global carbon index over its life cycle.
Briefly put, hydrogen can be produced, transported and stored responsibly, in terms of carbon emissions, provided the electricity used for these three steps is renewable.
Road transport: Hydrogen-powered vehicles are one solution for decarbonizing road transport (buses, cars and trucks). Their short refuelling times and lighter weight (compared to battery-powered electric vehicles) make them especially useful for long-haul and heavy-haul transportation. Japan, the United States, the EU and South Korea have the largest fleets of hydrogen-powered vehicles, but many other countries will soon be following suit. Quebec announced last November in the Legault administration’s 2030 Plan for a Green Economy that it would be prohibiting the sale of new gasoline-powered vehicles as of 2035. This measure should accelerate the adoption of fuel cell electric vehicles. Note that several car manufacturers have launched or announced the impending arrival of these types of vehicles.
Trains – boats: Hydrogen can be used to power trains and boats. Hydrogen trains can be refuelled in under 20 minutes, run up to 18 hours without refuelling and cover distances of up to 1,000 km at a maximum speed of 180 km/h.
Mixing: Green hydrogen can be added to other fuels (diesel, natural gas, etc.), thus making them cleaner. The distinct properties of hydrogen do, however, require fiber-reinforced polyethylene or polymer distribution pipes. Mixing hydrogen into the existing gas infrastructure is currently being tested in several countries throughout the world. Up to 10% of hydrogen can be added to natural gas in pipelines without altering its energy properties.
In Quebec, Evolugen, a subsidiary of Énergie Brookfield, and Gazifère Inc., a subsidiary of Enbridge, announced the construction of an electrolyzer in the city of Gatineau, close to Evolugen’s hydro-electric power plants. The green hydrogen produced on this site will be injected into Gazifère’s natural gas distribution network. A few weeks earlier, Enerkem, Shell, Suncor and Proman announced a biofuel plant project in Varennes that will be powered by the green hydrogen produced by Hydro-Québec.
Chemical products: Hydrogen is a core component of a large number of chemical industrial processes, notably the refining of petroleum and production of fertilizer, ammonia and methanol. Using clean hydrogen helps reduce the emissions these processes generate.
Costs: For hydrogen to be green, water must be electrolyzed using renewable energy (wind, solar, hydro power, etc.). Even though renewable energy production costs are dropping, they remain too high to make producing green hydrogen profitable without government support. It costs two to seven times more to produce green hydrogen than grey hydrogen.
Low density: Hydrogen storage and transportation are costly and energy intensive due to the fuel’s low density.
Safety: Although hydrogen is non-toxic and quickly dissipates into the air, it remains a highly flammable gas, making its transportation, storage and handling a costly and complex affair requiring specialized equipment.
What are the regulatory and legal challenges associated with developing hydrogen?
- Project developers will want to share the risks associated with investing in this nascent industry, while joint venture and partnership agreements will need to adequately provide for the roles and responsibilities of the parties and limit the project- and market-related risks;
- These major projects require leading-edge expertise in permitting, regulatory approvals and the implementation of complex financial and tax structures;
- The low-carbon-version of hydrogen can only be deployed and adopted on a wide scale if governments or public utilities offer incentives to increase demand and catalyze potential projects. The Quebec government appears to be doing just that in the 2030 Plan for a Green Economy, where it announced in November 2020 it would be investing $15 million to support innovative projects in this industry. In December 2020, the federal government introduced Hydrogen Strategy for Canada, an ambitious program that will help facilitate and increase the production and use of low-carbon fuels, including hydrogen, to achieve the net-zero emissions target by 2050.
- The regulations that should be adopted include:
- recognizing hydrogen as a renewable natural gas;
- making the production of hydrogen (and other products in which hydrogen is a component) eligible for greenhouse gas offset credits;
- providing a better framework for the safe deployment and use of hydrogen as a fuel;
- taking hydrogen’s global carbon index into account in the various programs designed to encourage the fuel’s use. Hydrogen’s carbon footprint should take compression, liquefaction, transport and storage into consideration, not only production.