Green Ammonia Production with Nuclear Power

Introduction: The economic feasibility of Green Ammonia

Feasibility studies have also explored the economics of smaller-scale green ammonia plants, including those in the range of the 200 TPD capacity (8). While larger plants often benefit from economies of scale, smaller, modular designs can offer advantages in terms of flexibility, reduced transportation costs for local use, and the ability to align production with distributed renewable energy sources (33). A study on hydropower-supported ammonia production indicated costs of approximately $400 per tonne in facilities with a capacity of 200 tonnes/day (54). Another study developed a conceptual design for a 300 TPD modular ammonia plant, suggesting the viability of plants in this size range (76). These studies indicate that a 200 TPD plant is a reasonable scale for green ammonia production, and its economic feasibility will depend heavily on the specific energy costs and technology choices.

Green ammonia, distinguished from conventional grey ammonia by its production process utilizing clean energy sources, has emerged as a critical component in the global transition towards a sustainable future (1). While traditional ammonia production relies on fossil fuels, releasing significant amounts of carbon dioxide, green ammonia leverages renewable electricity to produce hydrogen via water electrolysis, which is then synthesized with nitrogen from the air1. This carbon-free production pathway positions green ammonia as a promising solution for decarbonizing various sectors, including agriculture, where it serves as a vital fertilizer, and the energy industry, where it acts as a potential fuel and hydrogen carrier (1). The increasing global emphasis on achieving net-zero emissions by 2050 is a significant driver for exploring and implementing cost-effective green ammonia production technologies (6).

This paper analyzes the feasibility of producing green ammonia at a target cost of $300 per tonne from a 200 metric tonnes per day (TPD) plant. The unique aspect of this scenario is the proposed use of a small nuclear power plant as an energy source, providing electricity at a very competitive rate of $0.03 per kilowatt-hour (kWh) and a source of free heat. This combination of low-cost, carbon-free electricity and readily available heat is a pathway to achieving the desired production cost.

The analysis will delve into the typical green ammonia production process, identify the major cost components involved, evaluate the impact of the specified energy inputs, investigate the capital expenditure requirements for a plant of this scale, benchmark the target cost against current and projected market prices, explore relevant feasibility studies, and consider other operational costs to provide a comprehensive assessment of the project’s viability. The findings of this paper will be valuable for stakeholders considering investment or strategic planning in the green ammonia sector, particularly those interested in the potential of nuclear energy integration.

Numerous studies and reports have analyzed the economic feasibility of green ammonia production at various scales and using different renewable energy sources (3). These analyses often reveal a wide range of production costs, primarily influenced by the cost of electricity, the chosen electrolyzer technology, and the scale of production (17). Generally, these studies suggest that achieving cost-competitive green ammonia production is challenging but feasible under specific conditions, particularly when access to low-cost renewable energy is available (4).

Several studies have specifically considered the use of nuclear energy or very low electricity costs for green hydrogen and ammonia production19. These analyses often show more promising results for achieving lower production costs compared to scenarios relying on more variable renewable sources like solar or wind, or grid electricity with higher average prices (56). For instance, it has been estimated that the cost of electricity needs to be $30/MWh or less for green ammonia to be priced competitively with blue ammonia (36). The modeled LCOE for solar generation in some locations has been reported in the range of $21 to $30 per MWh (74). The cost of NH3 production from a nuclear-powered plant with high-temperature steam electrolysis (HTSE) was analyzed assuming an electricity cost of $30/MWh (73). These findings suggest that the $0.03/kWh electricity cost aligns with conditions that could lead to more economically viable green ammonia production.

Green Ammonia Production Overview

The production of green ammonia using electrolysis involves these stages:

1. Generation of green hydrogen through water electrolysis. In the first stage, water electrolysis, an electrolyzer uses electricity to split water molecules (H₂O) into hydrogen and oxygen (2). This process is considered “green” when the electricity is sourced from clean sources, such as nuclear power in this case, ensuring a near-zero carbon footprint (8). Several types of electrolyzers are available, including alkaline electrolyzers, polymer electrolyte membrane (PEM) electrolyzers, and solid oxide electrolyzers (SOEC), each with its own set of operating characteristics, efficiencies, and capital costs9. Alkaline electrolyzers are a mature technology with lower capital costs, while PEM electrolyzers offer higher efficiency and operational flexibility. SOECs operate at higher temperatures and can potentially achieve even higher efficiencies, especially when integrated with heat sources (9).
2. Extraction of Nitrogen from the air using an Air Separation Unit (1).
3. Synthesis of ammonia via the Haber-Bosch process (1). This is a well-established industrial method where hydrogen reacts with nitrogen to produce ammonia (1). In the Haber-Bosch process, purified hydrogen and nitrogen are compressed and then passed over a catalyst at high temperatures (typically 400-500°C) and pressures (150-250 bar) to form ammonia (6).

The production of one tonne of green ammonia via electrolysis is an energy-intensive process, with the majority of the energy demand stemming from the water electrolysis stage to produce hydrogen (13). Typically, the energy consumption for this pathway ranges from 10 to 12 megawatt-hours (MWh) of electricity per tonne of ammonia produced (13). Electrolysis alone can account for over 90% of this total energy consumption (13). Given this high energy intensity, the low electricity cost of $0.03/kWh provided by the small nuclear power plant represents a substantial advantage in potentially achieving a competitive green ammonia production cost (14).

Cost Components

The overall cost of producing green ammonia can be broadly categorized into capital expenditure (CAPEX), which includes the initial investment in plant and equipment, and operational expenditure (OPEX), which covers the ongoing costs of running the plant.

Capital Expenditure (CAPEX)

The major components of CAPEX for a green ammonia plant include the electrolyzer, the air separation unit (unless integrated), and the ammonia synthesis unit (12).

• Electrolyzer: The electrolyzer is often considered one of the most significant CAPEX components in a green ammonia plant (12). The cost of electrolyzers varies depending on the technology. For example, CAPEX ranges for electrolyzers greater than 10 MW have been estimated at $500-$1000/kW for alkaline and $700-$1400/kW for PEM technologies (18). Solid oxide electrolyzer systems are currently estimated at around $1100-$1300 USD per kW (19). These costs are subject to change with technological advancements and increasing the scale of manufacturing (17). The choice of electrolyzer technology will not only impact on the initial investment but also the operational efficiency and the potential for heat integration.
• Air Separation Unit (ASU): An ASU is required to separate nitrogen from the air for the Haber-Bosch process (12). This unit also contributes to the overall capital expenditure of the plant. However, certain advanced electrolysis technologies, such as solid oxide electrolyzers, may potentially be integrated in ways that reduce or eliminate the need for a standalone ASU in some configurations (21).
• Ammonia Synthesis Unit (Haber-Bosch): The Haber-Bosch synthesis reactor and its associated equipment represent another significant portion of the capital investment (12). This is a mature technology, and cost estimations are relatively well-established (9).
• Other Capital Costs: Besides the core process units, other capital costs include land acquisition, construction of buildings and infrastructure, storage facilities for ammonia, and other balance-of-plant equipment necessary for safe and efficient operations (18).

Estimating the capital expenditure (CAPEX) for a 200 metric tonnes per day (TPD) green ammonia plant involves a degree of variability depending on the specific technologies chosen, the location of the plant, and other project-specific factors (8). Research suggests a broad range of potential capital costs. For greenfield projects, which involve building a new plant from the ground up, the capital intensity is often estimated to be between $1,300 to $2,000 per tonne of annual ammonia capacity (20). For a 200 TPD plant, which translates to an annual capacity of approximately 60,000 to 70,000 tonnes per year (depending on plant load factor), this would suggest a CAPEX range of roughly $95 million to $146 million (20).

Other estimates, however, indicate potentially higher capital costs. A study scaled up and down the total capital investment of two green ammonia plants and obtained an acceptable capital cost from $496 million to $906 million for a plant capable of 266 TPD (17). This suggests that for a 200 TPD plant, the cost could still be significant, potentially in the range of $372 million to $680 million if scaled linearly. A Stamicarbon study concluded that a green ammonia project with a capacity of 112,000 tonnes per year (approximately 307 TPD) would require a CAPEX of €365 to €496 million 55. Scaling this down to 200 TPD linearly provides a rough estimate of €238 million to €324 million (approximately $250 million to $340 million based on current exchange rates).

Operational Expenditure (OPEX)

The major components of OPEX for a green ammonia plant include electricity, water supply, maintenance, labor, and transportation (18).

• Electricity: Electricity is typically the largest operational cost component in green ammonia production, as highlighted by several studies (17). However, the availability of electricity at $0.03/kWh from the nuclear power plant offers a significant advantage. This cost is notably lower than typical renewable energy costs reported in the literature, such as $0.041/kWh (24). This low electricity price has the potential to substantially reduce the overall production cost.
• Water Supply: Water is a crucial feedstock for the electrolysis process. Costs associated with water supply include sourcing, treatment, and deionization to ensure the purity required for efficient electrolyzer operation (17). While the exact cost will depend on the source and required purification levels, it is generally expected to be a smaller component of the total operational expenditure compared to electricity, especially with the potential for using free heat from the nuclear plant for desalination if needed (27).
• Maintenance: Regular maintenance of the electrolyzer, ASU, ammonia synthesis unit, and other equipment is essential for ensuring plant reliability and longevity (17). Maintenance costs can vary depending on the complexity and maturity of the chosen technologies and the intensity of plant operation (29).
• Labor: The operation of a 200 TPD green ammonia plant will require skilled personnel for various tasks, including plant operation, maintenance, and administration (17). Labor costs, including salaries and benefits, are an operational expense that must be considered.
• Transportation: Costs related to the transportation of any incoming materials (if required) and the distribution of the produced ammonia to the market are important operational considerations (17). The proximity of the plant to end-users will significantly impact these costs.
• Other Operational Costs: Additional operational expenses may include consumables, insurance, and other miscellaneous costs (17).

Impact of Electricity Cost at $0.03/kWh and Free Heat

The cost of electricity is a critical determinant in the economic feasibility of green ammonia production via electrolysis, often representing the largest single operating expense (17). The low electricity cost of $0.03/kWh ($30/MWh) provided by the small nuclear power plant has the potential to significantly reduce the production cost of green hydrogen, which in turn drives down the cost of green ammonia (14). For instance, studies indicate that for green hydrogen to be competitive, renewable power prices need to be at or below $30/MWh (36). Assuming an energy consumption of 10-12 MWh of electricity per tonne of green ammonia, the electricity cost alone would be in the range of $300 to $360 per tonne of ammonia.

The availability of free heat from the small nuclear power plant presents significant opportunities for heat integration within the green ammonia production process, potentially leading to substantial reductions in operational costs (12).

One key area for heat integration is steam generation, particularly if solid oxide electrolyzer cells (SOECs) are employed. SOECs operate at high temperatures (typically 700-900°C) and require steam as an input for electrolysis (11). Utilizing the free heat from the nuclear reactor to generate high-temperature steam can significantly reduce the electricity demand that would otherwise be needed for steam production, thereby lowering operational costs40. Studies have shown that in SOEC-based ammonia plants, a substantial portion of the steam needed for the electrolyzers can be generated through heat integration between the electrolyzer and the Haber-Bosch process (45).

Another potential application of the free heat is for feedwater preheating in the electrolysis process (41). Preheating the water before it enters the electrolyzer reduces the amount of energy required to bring it to the operating temperature, leading to efficiency gains and lower energy consumption. Even lower-temperature waste heat can be valuable for this purpose.

While the Haber-Bosch reaction is exothermic, meaning it releases heat, there might be opportunities to use the free heat for preheating the incoming reactant gases (hydrogen and nitrogen), potentially improving the overall efficiency of the synthesis process (41).

Furthermore, if the water source for the electrolyzer requires desalination, the free heat can be used to power desalination processes such as membrane distillation, which is particularly effective at utilizing low-grade heat sources (27). This could significantly reduce the cost associated with obtaining high-purity water for the electrolysis process.

Effective heat integration is crucial for maximizing the benefits of the free heat source and achieving the target production cost. By strategically utilizing the available heat in various stages of the green ammonia production process, the reliance on electricity for heating purposes can be minimized, leading to substantial operational cost savings and improving the economic feasibility.

Current and Projected Market Prices for Green Ammonia

The current market price for green ammonia is significantly higher than that of conventional (grey) ammonia, reflecting the higher production costs associated with green hydrogen (22). Prices for green ammonia have been reported in the range of $700 to $1,400 per tonne at sites with access to renewable resources like solar and wind (22). In some instances, prices have been even higher, such as $888/tonne for renewable-derived ammonia delivered to Far East Asia from the west coast of Canada (24). This indicates that the target production cost of $300/tonne is substantially lower than the current market prices, suggesting the potential for high profitability if this cost can be achieved.

Market analysts project a decrease in green ammonia prices in the future, driven by falling costs of renewable energy and advancements in electrolyzer technologies (22). Some projections estimate that the cost of green ammonia could drop to around $480 per tonne by 2030 and potentially reach $310 per tonne by 2050 (22). While these are long-term projections, they suggest that the $300/tonne target aligns with future expectations for the industry, implying potential long-term competitiveness even without the specific advantages of the nuclear-powered plant.

Benchmarking the $300/tonne target against conventional ammonia prices is also crucial. The cost of grey ammonia has ranged from $197 to $510 per tonne between FY 2019-20 and FY 2022-2363. Blue ammonia, which involves carbon capture and storage, has a levelized cost estimated around $390 per tonne (23). Achieving a production cost of $300/tonne would make the green ammonia from this plant highly competitive with both current grey ammonia prices and projected blue ammonia costs, offering a significant advantage in a market increasingly focused on decarbonization.

Conclusion

The analysis suggests that achieving a green ammonia production cost of $300/tonne from a 200 TPD plant (60,000 to 70,000 tonnes per year, depending on plant load factor) powered by a 100 MWe small nuclear reactor with electricity at $0.03/kWh and free heat is potentially feasible but highly dependent on several critical factors. The low electricity cost provides a significant advantage, potentially offsetting the high energy intensity of green ammonia production. Without free heat, however, the electricity cost alone could account for $300-$360 per tonne based on typical energy consumption figures, requiring careful cost-engineering.

The availability of free heat from the nuclear power plant offers substantial opportunities to reduce operational expenses through efficient heat integration. Utilizing this heat for steam generation (especially for SOEC technology), feedwater preheating, and potentially desalination could lead to significant cost savings. The capital expenditure for a 200 TPD green ammonia plant is substantial, with estimates ranging widely. Careful selection of electrolyzer technology and optimization of plant design will be crucial for managing upfront investment.

While the target production cost is significantly below current market prices for green ammonia, which range from $700 to $1,400 per tonne, it aligns with some long-term projections for the industry. Achieving this cost would make the plant highly competitive with both current grey ammonia prices ($197-$510/tonne) and estimated blue ammonia costs (~$390/tonne).

The unique combination of low-cost nuclear electricity and free heat offers a promising pathway towards achieving competitive green ammonia production, but careful planning and optimization are essential to realize this potential.

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