Материал: The_Future_of_Hydrogen-IEA-2020

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Four key value chains

These four value chains together represent a major opportunity to build a 2030 springboard for hydrogen to fulfil its longer-term potential (Table 11). They are combinations of hydrogen supply and demand that emerge from the analysis in Chapters 2 to 5, focusing on lower-cost and nearer-term opportunities that build on existing policies, infrastructure, skills, geographical advantage and demand for hydrogen. This approach minimises risk for governments and the private sector, while still achieving significant scale.

Each of these value chains is described in more detail in this chapter, and their policy requirements identified. The four value chains are not independent, as developments in one will benefit the others in realising cost reductions and innovation. Furthermore, within the same region there could be opportunities to exploit synergies between them, for example for truck fleets operating between industrial clusters and along transport corridors. Reaping the cost benefits of economies of scale in hydrogen supply and distribution is likely to require the cumulative demand of several sectors in a region, not one application alone. For example, a growing hydrogen network for vehicle refuelling could help launch flexible low-carbon power generation. Success in each of the value chains will help provide the conditions for success in others.

Five types of policy need to work together

Regardless of which value chains individual governments wish to explore and develop, policy efforts will be needed with the aim of:

1.Establishing targets and/or long-term policy signals.

2.Supporting demand creation.

3.Mitigating investment risks.

4.Promoting R&D, strategic demonstration projects and knowledge sharing.

5.Harmonising standards, removing barriers.

Targets and/or long-term policy signals are needed to provide stakeholders with certainty that there will be a future marketplace for hydrogen. Climate policies, in particular, will be crucial in this regard. Actions could include the putting in place of high-level instruments such as emissions reduction targets, or commitments to deploy certain energy resources or carbon

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pricing systems. In the transport sector, 2030 deployment targets for fuel cell vehicles and hydrogen refuelling stations already play this role in several countries.

Targets alone, however, will not be sufficient to develop an effective springboard for the four value chains over the next decade. The following sections examine these near-term value chains in turn, describing specific examples and targeted recommendations for each under the five policy categories set out above. These recommendations are aimed at helping various end-use sectors to embrace a switch to new cleaner fuels and feedstocks. For each value chain, policies that are technology neutral are preferable, but can be complemented by additional measures to support promising hydrogen technologies as they scale up towards cost-competitiveness.

Taken together, the value chains offer a cost-effective, practical path toward ensuring that hydrogen in 2030 will be primed to play a potentially critical role in the longer-term global effort to achieve a clean, secure, resilient and cost-effective global energy system. In addition to the specific measures needed for each value chain, a number of measures are likely to be needed regardless of which hydrogen sources and applications are supported. These are presented in Table 12 and apply to all four value chains.

There is no one-size-fits-all for hydrogen policy

Individual countries will always base their policies and actions on the social and political priorities and constraints facing them, as well as resource availability and existing infrastructure. That is the case for all energy technologies and is certainly the case for hydrogen. Some countries may wish to prepare the ground for larger and cleaner future hydrogen products and markets by exploiting near-term opportunities based on fossil fuels and take a phased approach to shifting to low-carbon hydrogen. This approach might help enable scale-up in the near term. However, the limited environmental benefits of such an approach, or even negative environmental impacts, mean that a strategy to deploy CCUS or low-carbon hydrogen at a later stage is essential. Other countries may choose to build up hydrogen products and markets solely based on a chosen set of low-carbon sources, such as renewable electricity. In both cases, there may be opportunities to draw upon energy resources that are currently underutilised or used in lower-value applications today in ways that help manage near-term cost and risks (in Box 17). If it is possible to use these resources in high-value applications, such as transport or chemicals, it can raise the efficiency of the whole system.

Whatever policy options different governments choose, however, their signals will be much stronger if their levels of ambition and timing are broadly aligned across different levels of government and internationally. Hydrogen producers and supply chains will need to be able to access financing based on an international outlook and the largest possible markets for scaleup.

Box 17. Putting low-cost energy resources to higher-value uses

As a chemical energy carrier, hydrogen can redirect both chemical and electrical energy into applications that are currently configured to use primarily chemical energy, such as transport. Four main sources of undervalued energy resources could be redirected to supply hydrogen refuelling stations, or other sources of demand for hydrogen and hydrogen carriers:

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Curtailed and under-remunerated renewable electricity. Although curtailment in China is

declining, over 100 TWh of solar, wind and hydro output were curtailed there in 2017 (IEA, 2018c), roughly equivalent to the level of electricity consumption in the Netherlands. In Germany, 5.5 TWh of power were curtailed in 2017 (Bundesnetzagentur, 2018). Redispatching and curtailment costs amounted to USD 1.2 billion in Germany in 2017 and USD 1.1 billion in the United Kingdom in 2018 (Bundesnetzagentur, 2018; National Grid, 2019). There would be obvious benefits from making productive use of curtailed output. In 2018 three German grid operators announced plans for a 100 MW electrolyser in Lower Saxony where there is regularly too much offshore wind energy for the existing grid, with refuelling stations cited as providing potential hydrogen demand (Tennet, 2018). Besides curtailment, some renewable electricity installations receive less revenue when they produce most energy because spot prices fall in response to high output from wind or solar or both. To hedge this risk, project developers – including hydropower operators that sometimes have “spill” water – could contract with off-takers at an agreed price. However, the incentives and power prices would have to be very attractive to offset the reduced number of hours the electrolyser can operate on this power source (Chapter 2) and the costs of buffer hydrogen storage to manage variability.

Inflexible power plants. Some co-generation plants overproduce electricity at times of high heat demand when the local power grid does not have sufficient power demand. This is the case in North East China, for example, where the inflexibility of coal plants caused by heat loads was a factor in the curtailment of 40 TWh of wind power in 2017. Until the heat demand in these regions is met by other sources of energy, production of hydrogen via electrolysis could potentially be used to avoid curtailment of either coal or renewable electricity if sufficient full load hours of the electrolyser are possible at low power prices. In the longer term any use of coal to produce hydrogen would need to be coupled with CCUS in order to deliver emissions reductions.

By-product and vented hydrogen. Some industries produce hydrogen as a by-product that they do not need (for example steam crackers, chlor-alkali electrolysers and propane dehydrogenation). Merchant hydrogen suppliers collect and purify some of this hydrogen for

sale to refineries, chemical plants and others. However, up to 0.5 MtH2 worldwide is currently vented to the air from these processes. Another 22 MtH2 is used for relatively lowvalue applications such as heat and power generation without purification. In combination, this theoretically represents enough hydrogen to power 180 million cars.

Renewable gas. Biogas from anaerobic digesters, dairy farms and landfill is often used for relatively low-value local heat applications. By treating the gas, these resources can be injected in the gas grid and, if accounting systems are in place as in California, sold “virtually” to operators of existing hydrogen production plants running on natural gas.

These resources are not available in all places, but where they are available they could reduce emissions and the need for new investment, potentially decreasing co-ordination challenges.

Sources: IEA (2018b), Market Report Series: Renewables 2018; Bundesnetzagentur (2018), Monitoring Report 2018 – Key Findings; National Grid (2019), Monthly System Balancing Reports; Tennet (2018), “Gasunie, TenneT and Thyssengas reveal detailed, green ‘sector coupling’ plans using power-to-gas technology”.

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