Levelised cost of ammonia for green, blue, and grey production routes. Adjust parameters, compare scenarios, and analyse sensitivities. All calculations are performed locally in your browser.
Full derivation of every equation used in this tool. The methodology is currently under active review as part of the Observatory's green ammonia pricing research programme — feedback and corrections are welcomed.
The levelised cost of ammonia (LCOA) is the minimum price at which ammonia must be sold over a plant's lifetime to recover all costs including capital, operating expenditure, feedstock, and a required return on investment. It is expressed in real USD per tonne of NH₃ (ex-works unless transport costs are added).
The general LCOA formula is:
All costs are expressed per tonne of ammonia produced annually at nameplate capacity. Two financing modes are available: Simple mode uses a capital recovery factor (CRF) to annualise capital costs; Advanced mode uses a full discounted cash flow (DCF) model with explicit debt and equity structure.
The capital recovery factor converts a total capital expenditure into an equivalent uniform annual payment over the plant lifetime, given a discount rate (WACC). It is the standard approach used by IEA, IRENA, and CSIRO in published LCOA estimates.
Annualised capex per tonne of annual production capacity is then:
Fixed opex is expressed as a percentage of capex per year and added to the annualised capex. Variable opex (water, catalysts, consumables) is approximated within the fixed opex percentage for simple mode.
Advanced mode derives the after-tax WACC from explicit debt and equity parameters using the standard Modigliani-Miller formulation with the corporate tax shield on debt:
The CRF is then recalculated using this after-tax WACC, replacing the single discount rate used in simple mode. Loan tenor is used to determine the debt service schedule but does not directly appear in the LCOA formula — it constrains the period over which the tax shield applies.
For the green route, advanced mode also adds an annualised stack replacement cost using a sinking fund factor (SFF). The SFF represents the annual contribution to a fund that accumulates to the replacement cost at the replacement interval:
Note: a known limitation of the current implementation is that the sinking fund approach slightly underestimates the true NPV cost of stack replacements occurring late in the plant life, as it does not account for the time value of money between replacement events. A full NPV treatment of each replacement event is on the roadmap for a future version.
Green ammonia production combines water electrolysis (producing H₂) with air separation (producing N₂) and Haber-Bosch synthesis. The electricity cost dominates for most parameter combinations.
Electricity consumption per tonne NH₃:
Electricity cost component:
Electrolyser capacity required (capacity sizing):
Full green LCOA:
Carbon cost on green route: Lifecycle CO₂ emissions of green ammonia produced from renewable electricity are assumed to be approximately zero (upstream electricity emissions excluded under renewable energy certification). No carbon cost is therefore applied in the current model. A future version will allow users to input an upstream emissions factor for grid-connected electrolysers.
Blue ammonia uses steam methane reforming (SMR) or autothermal reforming (ATR) with carbon capture and storage (CCS). Natural gas is both feedstock and fuel. CCS captures a fraction of process CO₂; the remainder is unabated and subject to carbon pricing.
Gas cost:
CCS cost:
Carbon cost (on unabated fraction):
Full blue LCOA:
Conventional grey ammonia via SMR with no CCS. The grey route serves as the cost reference against which green and blue premiums are assessed. All CO₂ emissions are unabated and fully subject to carbon pricing.
| Parameter | Default | Basis | Source |
|---|---|---|---|
| LCOE (green) | $45/MWh | Global average utility-scale solar+wind hybrid 2024–25 | BloombergNEF 2024 |
| Capacity factor | 45% | Hybrid solar/wind dedicated supply, mid-latitude | IRENA 2022 |
| Electrolyser capex (ALK) | $850/kW | Installed system cost, large-scale alkaline, 2024–25 | IEA 2023; BNEF 2024 |
| Electrolyser efficiency | 65 kWh/kgH₂ | System-level ALK incl. BoP, compression, drying | IEA 2023; CSIRO 2023 |
| HB plant capex | $500/tNH₃ | Large-scale green HB synthesis unit, 2023–24 engineering estimates | CSIRO 2023; Haldor Topsoe |
| WACC (green) | 8% | Emerging market / greenfield project, 2024 | IEA 2023; Observatory estimate |
| Gas price (blue/grey) | $8/GJ | Mid-range global LNG netback / pipeline gas, 2025 | S&P Global 2025 |
| CCS cost | $80/tCO₂ | Point-source capture + transport + storage, 2024 estimates | Global CCS Institute 2023 |
| CCS capture rate | 90% | Post-combustion capture on SMR; process CO₂ typically higher rate achievable | IEA 2023 |
| CO₂ intensity (grey) | 2.4 tCO₂/tNH₃ | Plant boundary, process + energy combustion; excludes upstream methane | IEA 2023; IPCC AR6 |
| Plant lifetime | 25 years | Standard assumption for large industrial plant financing | Industry convention |
This calculator is in active development as part of the Observatory's green ammonia pricing research workstream. The following items are currently under review or planned for future versions:
The Observatory welcomes corrections to default values, methodology feedback, and suggestions for additional routes or parameters from researchers, project developers, and practitioners in the sector.
Ammonia Observatory LCOA Calculator. Results are indicative estimates based on user inputs and standard engineering assumptions. Not a substitute for project-level feasibility analysis. Default values sourced from IEA (2023), IRENA (2022), CSIRO (2023), and BloombergNEF (2024). Corrections and methodology feedback to [email protected].