Geospatial analysis of commodity production costs

Geo-X calculates the levelised cost (LC) of commodity production at specified demand locations, accounting for production, storage, transport, and where relevant conversion costs across all potential production locations.

These results can be compared with current or projected regional prices to assess economic competitiveness.

Implemented commodities

Geo-X currently supports the following commodities:

• Green hydrogen
• Green ammonia
• Green copper

Copper production is modelled under off-grid, hybrid, and grid-connected electricity supply scenarios, which are reported separately. Hydrogen and ammonia production, by contrast, are restricted to off-grid renewable electricity.

The codebase is written in a modular and extensible manner, allowing additional commodities to be implemented in the future.

Example use cases

The repository includes illustrative case studies:

• Namibia: hydrogen and ammonia production
• Zambia: copper production

These should be changed for your run(s). Parameter references for the hydrogen case are provided at the end of this file.
Because the framework is generalised, Geo-X can be applied to a wide range of geographic regions beyond these examples.

Geo-X builds upon:

• A preliminary model by Leander Müller (CC-BY-4.0):
  https://github.com/leandermue/GEOH2
• Code developed by Nick Salmon (MIT licence):
  https://github.com/nsalmon11/LCOH_Optimisation

---

Contents

• Setup instructions
• Preparing input data
• Running Geo-X with Snakemake
• Definitions of all rules
• Limitations
• Citation
• Case study parameters

Setup instructions

Follow the steps below before running Geo-X.

Geo-X is implemented using Snakemake, which automates workflow execution using rules. Each rule corresponds to a specific part of the codebase and performs a distinct function.

This installation requires Git for version control. If Git is not installed, follow these instructions: https://git-scm.com/book/en/v2/Getting-Started-Installing-Git

1) Clone the repository

Clone the Geo-X repository using Git.

... % git clone https://github.com/ClimateCompatibleGrowth/Geo-X.git

2) Set up the environment

The Python package requirements are specified in the environment.yaml file.

Install these requirements in a new environment using the mamba package and environment manager (installation instructions are available here):

.../geo-x % mamba env create -f environment.yaml

Activate the newly created environment:

.../geo-x % mamba activate geox

3) Get a Climate Data Store (CDS) API key

To simulate commodities produced using renewable energy, historical climate data are required as an input.

The get_weather_data rule can be used to download the relevant data from the ERA5 reanalysis dataset using Atlite to create a weather cutout.

To enable this step, register for and configure your CDS API key as described on the Climate Data Store website.

4) Install a solver

To run the plant_optimization rule, an optimisation solver must be installed.

You can use any solver compatible with PyPSA, such as:

• Cbc: free and open source
• Gurobi: commercial, with free academic licences available

Install your chosen solver following the instructions provided in the solver's documentation.

---

Preparing input data

Before running Geo-X, you must prepare the required input data.

Geo-X uses three types of input data:

1. Spatial input data
2. Techno-economic and plant parameters
3. A configuration file

If you intend to include hydropower or geothermal or nuclear as generation technologies, additional input files are required, as described below.

1) Prepare input hexagons

Spatial input data are represented as a set of hexagons using the H3 standard.

To analyse a different area of interest, the hexagon file must be replaced with one that follows the same structure and conventions as the provided example. Both example hexagon files might require updating at the time of use.

A full walkthrough for creating these hexagons, including the required tools, is available in the Geo-X-data-prep repository.

Required hexagon attributes

Each hexagon file must contain the following attributes:

• waterbody_dist: Distance to selected waterbodies in area of interest
• waterway_dist: Distance to selected waterways
• road_dist: Distance to road network
• solar: Theoretical potential of standardised PV plants (can be calculated with GLAES)
• wind: Theoretical potential of standardised wind turbines (can be calculated with GLAES)

Additional attributes

For coastal countries, the following attribute is required:

• ocean_dist: Distance to ocean coastline

For copper analyses, the following additional attributes are required:

• grid_dist: Distance to the electricity grid network
• pop: Population within the hexagon (required when community_energy_access is due to be set to a float value in the config file)

The ccg-spider repository can be used to combine multiple spatial data into standard H3 hexagons.

File placement

Once the hexagon file has been created, place it in the following location:

data/[COUNTRY ISO CODE]/hex_final_[COUNTRY ISO CODE].geojson

(Optional) Hydropower files

Hydropower input files can be obtained by:

• Running the Geo-X-data-prep repository
• Downloading data from the HydroBASINS section of HydroSHEDS, choose a level that suits the country being analysed

Place the following files inside data/[COUNTRY ISO CODE]/, one file must be renamed to match the required format:

• [COUNTRY ISO CODE]_hydropower_dams.gpkg
• All the files from the HydroBASINS download (or the Shapefile cannot be used)

(Optional) Geothermal GeoPackage file

The geothermal GeoPackage file can be obtained by running the Geo-X-data-prep repository.

Place the following file inside data/[COUNTRY ISO CODE]/, it must be renamed to match the required format:

• [COUNTRY ISO CODE]_geothermal_plants.gpkg

(Optional) Nuclear GeoPackage file

The nuclear GeoPackage file can be obtained by running the Geo-X-data-prep repository.

Place the following file inside data/[COUNTRY ISO CODE]/, it must be renamed to match the required format:

• [COUNTRY ISO CODE]_nuclear_plants.gpkg

2) Prepare input parameter Excel files

Next, prepare the techno-economic input parameter spreadsheets.

Required input parameters include the spatial area of interest, total annual demand for the commodity, and prices and cost of capital for infrastructure investments.

These values can be either current conditions or projected values for a single snapshot in time.

All parameter values used by the model are specified in a set of Excel and CSV files located in the parameters folder. All files should be checked to ensure they are correctly set up before running the model.

Parameter file overview

• Basic plant parameters The basic_[COMMODITY ABBREVIATION]_plant folder contains several CSV files defining global parameters for optimizing the plant design.
  • All power units must be in MW
  • All energy units must be in MWh
  • The generators.csv file must only include the generators that you wish to use in the optimisation

For further details on these parameters, refer to the PyPSA documentation.

• Conversion parameters The conversion_parameters.xlsx file defines parameters related to converting between different states of the commodity. This file is required for the hydrogen and copper folders.

• Country parameters Thecountry_parameters.xlsx file includes country- and technology-specific parameters such as:

  • Interest rates
  • Heat and electricity costs
  • Asset lifetimes.

  Additional notes:

  • Interest rates should be expressed as decimals (e.g. 5% as 0.05).
  • Asset lifetimes should be in years.
  • The file may contain columns for generators that are not being considered.

• Demand parameters The demand_parameters.xlsx file defines the set of demand centers.

  For each demand center, the following must be specified:

  • Latitude and longitude
  • Annual demand
  • Commodity state at the demand location

• Pipeline parameters The pipeline_parameters.xlsx file contains price, capacity, and lifetime data for different pipeline sizes. This file is required for the hydrogen and ammonia folders.

• Technology parameters The technology_parameters.xlsx file includes parameters related to:

  • Water costs and/or usage
  • Road infrastructure

• Transport parameters The transport_parameters.xlsx file defines parameters for road transport of the commodity, including:

  • Truck speed
  • Transport cost
  • Asset lifetime
  • Transport capacity

3) Modify the config file

High-level workflow settings are controlled in the configuration file: config.yaml.

Wildcards

Wildcards are defined in the scenario section of the config file and determine which data are used in the workflow.

They can be changed to match the case you're analysing:

• country: ISO standard 2-letter country abbreviation
• weather_year: A 4-digit year from 1940 onwards included in the ERA5 dataset
• plant_type: The commodity to be produced (hydrogen, ammonia, or copper)

Weather data

The amount of weather data used in the analysis is controlled using the following parameters:

• years_to_check: The number of years of weather data to use (must be an integer value)

For example, if you want weather data to start in 2015 and span five years, set
weather_year to 2015 and years_to_check to 5.

The temporal resolution of the data used in the optimisation can be set using:

• freq: Data frequency (e.g., 1H for hourly, 3H for three-hourly)

Generators

The renewable generation technologies considered for plant construction are defined in the generators_dict section.

Currently supported generator types are:

• solar
• wind
• hydro
• geothermal
• nuclear

Ensure that all generators you wish to consider are included in the dictionary, and remove any that are not required.

Generator-specific technology assumptions can be modified as follows:

• panel: Solar panel technology (used if solar is included)
• turbine: Wind turbine technology (used if wind is included)

Installed capacity assumptions are defined in the gen_capacity section:

• solar and wind: Values can be adjusted as needed for the analysis
• hydro, geothermal and nuclear: Values should not be changed

Efficiency of generator plants

Average generation efficiencies can be specified for:

• hydro
• geothermal
• nuclear

Efficiencies should be provided as float values and adjusted as necessary.

Other configuration options

• solver: Specify the name of the optimisation solver to be used

Water constraints

The water section controls whether water scarcity is considered:

• has_ocean_dists: Set to True if country is coastal, otherwise False for a landlocked country
• has_limit: Set to True to include a water availability constraint. Only required for hydrogen and ammonia
• annual_limit: Annual water availability limit in cubic meters (required if has_limit is set to True)

Transport infrastructure

The transport section controls whether infrastructure construction is permitted:

• pipeline_construction: Enable or disable pipeline construction. Only required for hydrogen and ammonia
• road_construction: Enable or disable road construction

Currency

Specify the currency used across all parameter files.

For example, in any case study’s technology_parameters.xlsx file, the Water sheet contains a row labelled Water specific cost (euros/m3). If you change the currency in the parameter files, you must also update this value to ensure consistency across the model.

Spatial filtering

• restrict_hexagons: If set to True, results will only be produced for hexagon(s) containing demand centres. All other hexagons will be set to null.

Copper-only configuration options

The following settings are only relevant when plant_type is set to copper:

• grid_construction: If True, grid infrastructure may be constructed to supply electricity

• size_offgrid_feedstocks: If True, a file containing costs related to an off-grid feedstock system will be outputted to the results/ folder

---

Running Geo-X with Snakemake

Once the repository setup is complete and all input data have been prepared, you are ready to run Geo-X!

This repository uses Snakemake to automate the workflow. For a gentle introduction to Snakemake, see Getting Started with Snakemake on The Carpentries Incubator.

Geo-X is executed by specifying a rule name when running Snakemake. Snakemake will automatically resolve dependencies and execute all required rules defined in the Snakefile to produce the requested outputs.

Computational resources

When running any Snakemake rule, you must specify the number of CPU cores to use; NUMBER OF CORES TO BE USED. The maximum is 4 cores.

Expected run times

Run times vary depending on the rule being executed:

• get_weather_data: Depending on country size and internet connection, this rule may take from a few minutes to several hours. Ensure that sufficient disk space is available, as weather data files can be several GB in size.

• optimize_plant: Depending on country size and the number of demand centres, this rule may take from several minutes to several hours.

• All other rules: Usually complete within a few seconds.

1) Get weather data (if needed)

If you already have weather data for your area of interest, you can proceed directly to the next step. Otherwise, run the weather data rule to download the required data from the CDS API:

snakemake -j [NUMBER OF CORES TO BE USED] run_weather

2) Run optimization or mapping rules

Next, run the Geo-X optimisation workflow.

The rules in this section execute the entire workflow, so you do not need to run each individual rule step-by-step. If any input files are modified after a completed run, the same command can be executed again and Snakemake will automatically re-run only the steps required to update the results.

Before running these rules, ensure that the required weather file(s) are present in the cutouts directory. Each file must be named [COUNTRY ISO CODE]_[WEATHER YEAR].nc for each country being analysed.

Run total commodity cost optimisation

To calculate the total commodity cost for all scenarios, run:

snakemake -j [NUMBER OF CORES TO BE USED] optimise_all

Generate component breakdown and cost maps

To generate a further breakdown of the energy component and spatial maps of commodity costs for all scenarios, run:

snakemake -j [NUMBER OF CORES TO BE USED] map_all

---

Definitions of all rules

All rules are documented below for completeness; however, you do not need to run each rule individually.

In most cases, you can simply run one of the optimisation or mapping rules described in the previous section. Snakemake will automatically ensure that all required rules are executed in the correct order.

get_weather_data rule

Downloads weather data for the area of interest to support generation optimisation.

snakemake -j [NUMBER OF CORES TO BE USED] cutouts/[COUNTRY ISO CODE]_[WEATHER YEAR].nc

optimize_transport rule

Calculates the cost of the optimal commodity transportation strategy from each hexagon to each demand centre, using available transport options.

This rule uses parameters from:

• technology_parameters.xlsx
• demand_parameters.xlsx
• country_parameters.xlsx

For hydrogen and copper, the parameters from conversion_parameters.xlsx are also included.

snakemake -j [NUMBER OF CORES TO BE USED] resources/hex_transport_[COUNTRY ISO CODE]_[PLANT TYPE].geojson

calculate_water_costs rule

Calculates water supply costs from water sources for commodity production in each hexagon.

This rule uses parameters from:

• technology_parameters.xlsx
• country_parameters.xlsx

snakemake -j [NUMBER OF CORES TO BE USED] resources/hex_water_[COUNTRY ISO CODE]_[PLANT TYPE].geojson

optimize_plant rule

Designs a production plant to meet the commodity demand profile for each demand centre, accounting for all available transportation options.

Ensure that:

• Plant parameters are specified in basic_[COMMODITY ABBREVIATION]_plant
• Demand centres are defined in demand_parameters.xlsx

snakemake -j [NUMBER OF CORES TO BE USED] resources/hex_lc_[COUNTRY ISO CODE]_[WEATHER YEAR]_[PLANT TYPE].geojson

calculate_total_cost rule

Combines calculated componenets to identify the lowest-cost supply option for each demand centre.

snakemake -j [NUMBER OF CORES TO BE USED] results/hex_total_cost_[COUNTRY ISO CODE]_[WEATHER YEAR]_[PLANT TYPE].geojson

calculate_cost_components rule

Calculates the cost contribution of components within the energy component for each hexagon.

snakemake -j [NUMBER OF CORES TO BE USED] results/hex_cost_components_[COUNTRY ISO CODE]_[WEATHER YEAR]_[PLANT TYPE].geojson

calculate_map_costs rule

Generates spatial visualisations of different cost components per kilogram of commodity.

snakemake -j [NUMBER OF CORES TO BE USED] plots/[COUNTRY ISO CODE]_[WEATHER YEAR]_[PLANT TYPE]

---

Limitations

Geo-X has several important limitations that should be considered when interpreting results.

The model primarily considers greenfield generation, meaning that it does not account for existing generation assets.
Electricity supply is assumed to be based on newly constructed infrastructure, and any excess electricity generation is assumed to be fully curtailed.

Grid electricity is not considered for most commodities, except where explicitly enabled (e.g. grid-connected and hybrid scenarios for copper) and still takes a broad approach with calculating the costs associated.

While the design of the commodity plant is convex and therefore guaranteed to find the global optimum solution if it exists, the selection of the trucking strategy is greedy to avoid the long computation times and potential computational intractability associated with a mixed-integer optimization problem.

Currently, only land transport is considered in the model. To calculate the cost of commodity production for export, any additional costs for conversion and transport via ship or undersea pipeline must be added in post-processing.

Transport costs are calculated from the center of the hexagon to the demand center. When using large hexagon sizes, this assumption may over- or underestimate transportation costs significantly. Additionally, only path length is considered when calculating the cost of road and pipeline construction. Additional costs due to terrain are not considered.

---

Citation

If you decide to use Geo-X, please kindly cite us using the following:

Sanchez-Lopez, M., Naqvi, S., Leonard, A., Schirren, L., & Hirmer, S. (2026). Geo-X: Generalised geospatial software for production of green commodities. SoftwareX, 34, 102712. https://doi.org/10.1016/j.softx.2026.102712

@article{Geo-X-2026,
title = {Geo-X: Generalised geospatial software for production of green commodities},
journal = {SoftwareX},
volume = {34},
pages = {102712},
year = {2026},
issn = {2352-7110},
doi = {https://doi.org/10.1016/j.softx.2026.102712},
author = {Miguel Sanchez-Lopez and Samiyha Naqvi and Alycia Leonard and Lukas Schirren and Stephanie Hirmer},
}

---

Case study parameters

This repository includes sample parameters for a hydrogen production case in Namibia. References for these parameters are included in the tables below for reference. For the results of this case, please refer to the GeoH2 model MethodsX article: https://doi.org/10.1016/j.mex.2024.102660.

Green hydrogen plant parameters:

Hardware	Parameter	Value	Units	Ref.
Solar photovoltaic	Capex	1,470,000	€/MW	Allington et al., 2021
Wind turbines	Capex	1,580,000	€/MW	Allington et al., 2021
Hydrogen electrolysis	Capex	1,250,000	€/MW	Müller et al., 2022
Hydrogen electrolysis	Efficiency	0.59	MWh H2/MWh el	Taibi et al., 2020
Hydrogen compression	Isentropic efficiency	0.051	MWh el/MWh H2	Müller et al., 2022
Hydrogen storage unloading	Efficiency	1	MWh H2/MWh H2-stored	Assumption
Battery	Capex	95,000	€/MW	BloombergNEF, 2022
Hydrogen storage	Capex	21,700	€/MWh	Müller et al., 2022

Conversion parameters:

Process	Parameter	Value	Units	Ref.
500 bar compression	Heat capacity	0.0039444	kWh/kg/K	Kurzweil and Dietlmeier, 2016
500 bar compression	Input temperature	298.15	K	Müller et al., 2022
500 bar compression	Input pressure	25	bar	Müller et al., 2022
500 bar compression	Isentropic exponent	1.402		Kurzweil and Dietlmeier, 2016
500 bar compression	Isentropic efficiency	0.8		Müller et al., 2022
500 bar compression	Compressor lifetime	15	years	Cerniauskas, 2021
500 bar compression	Compressor capex coefficient	40,035	€/kg H2/day	Cerniauskas, 2021
500 bar compression	Compressor opex	4	% capex/year	Cerniauskas, 2021
Hydrogen liquification	Electricity demand	9.93	kWh/kg H2	Ausfelder and Dura
Hydrogen liquification	Capex quadratic coefficient	-0.0002	€/(kg H2)^2	Müller et al., 2022
Hydrogen liquification	Capex linear coefficient	1,781.9	€/kg H2	Müller et al., 2022
Hydrogen liquification	Capex constant	300,000,000	€	Müller et al., 2022
Hydrogen liquification	Opex	8	% capex/year	Cerniauskas, 2021
Hydrogen liquification	Plant lifetime	20	years	Cerniauskas, 2021
LOHC hydrogenation	Electricity demand	0.35	kWh/kg H2	Andersson and Grönkvist, 2019
LOHC hydrogenation	Heat demand	-9	kWh/kg H2	Hydrogenious, 2022
LOHC hydrogenation	Capex coefficient	0.84	kWh/kg H2/year	IEA, 2020
LOHC hydrogenation	Opex	4	% capex/year	IEA, 2020
LOHC hydrogenation	Plant lifetime	25	years	IEA, 2020
LOHC hydrogenation	Carrier costs	2	€/kg carrier	Clark, 2020
LOHC hydrogenation	Carrier ratio	16.1	kg carrier/kg H2	Arlt and Obermeier, 2017
LOHC dehydrogenation	Electricity demand	0.35	kWh/kg H2	Andersson and Grönkvist, 2019
LOHC dehydrogenation	Heat demand	12	kWh/kg H2	Hydrogenious, 2022
LOHC dehydrogenation	Capex coefficient	2.46	kWh/kg H2	IEA, 2020
LOHC dehydrogenation	Opex	4	% capex/year	IEA, 2020
LOHC dehydrogenation	Plant lifetime	25	years	IEA, 2020
Ammonia synthesis	Electricity demand	2.809	kWh/kg H2	IEA, 2021
Ammonia synthesis	Capex coefficient	0.75717	kWh/g H2/year	IEA, 2021
Ammonia synthesis	Opex	1.5	% capex/year	IEA, 2020
Ammonia synthesis	Plant lifetime	25	years	IEA, 2020
Ammonia cracking	Heat demand	4.2	kWh/kg H2	Andersson and Grönkvist, 2019
Ammonia cracking	Capex coefficient	17,262,450	kWh/g H2/hour	Cesaro et al., 2021
Ammonia cracking	Opex	2	% capex/year	Müller et al., 2022
Ammonia cracking	Plant lifetime	25	years	Müller et al., 2022

Trucking parameters:

Hardware	Parameter	Value	Units	Ref.
All trucks	Average truck speed	70	km/h	Assumption
All trucks	Working hours	24	h/day	Assumption
All trucks	Diesel price	1.5	€/L	Assumption
All trucks	Driver wage	2.85	€/h	Müller et al., 2022
All trucks	Working days	365	days/year	Assumption
All trucks	Max driving distance	160,000	km/year	Müller et al., 2022
All trucks	Truck capex	160,000	€	Reuss et al., 2017
All trucks	Truck Opex	12	% capex/year	Reuss et al., 2017
All trucks	Diesel consumption	35	L/100 km	Reuss et al., 2017
All trucks	Truck lifetime	8	years	Reuss et al., 2017
All trucks	Trailer lifetime	12	years	Reuss et al., 2017
500 bar hydrogen trailer	Trailer capex	660,000	€	Cerniauskas, 2021
500 bar hydrogen trailer	Trailer opex	2	% capex/year	Cerniauskas, 2021
500 bar hydrogen trailer	Trailer capacity	1,100	kg H2	Cerniauskas, 2021
500 bar hydrogen trailer	Loading and unloading time	1.5	hours	Cerniauskas, 2021
Liquid hydrogen trailer	Trailer capex	860,000	€	Reuss et al., 2017
Liquid hydrogen trailer	Trailer opex	2	% capex/year	Reuss et al., 2017
Liquid hydrogen trailer	Trailer capacity	4,300	kg H2	Reuss et al., 2017
Liquid hydrogen trailer	Loading and unloading time	3	hours	Reuss et al., 2017
LOHC trailer	Trailer capex	660,000	€	IEA, 2020
LOHC trailer	Trailer opex	2	% capex/year	Reuss et al., 2017
LOHC trailer	Trailer capacity	1,800	kg H2	Reuss et al., 2017
LOHC trailer	Loading and unloading time	1.5	hours	Reuss et al., 2017
Ammonia trailer	Trailer capex	210,000	€	IEA, 2020
Ammonia trailer	Trailer opex	2	% capex/year	IEA, 2020
Ammonia trailer	Trailer capacity	2,600	kg H2	IEA, 2020
Ammonia trailer	Loading and unloading time	1.5	hours	IEA, 2020

Road parameters:

Road length	Parameter	Value	Units	Ref.
Short road (<10 km)	Capex	626,478.45	€/km	Müller et al., 2022
Long road (>10 km)	Capex	481,866.6	€/km	Müller et al., 2022
All roads	Opex	7,149.7	€/km/year	Müller et al., 2022

Pipeline parameters:

Pipeline size	Parameter	Value	Units	Ref.
All pipelines	Opex	1.25	% capex/year	Jens et al., 2021
All pipelines	Availability	95	%	Müller et al., 2022
All pipelines	Pipeline lifetime	42.5	years	Jens et al., 2021
All pipelines	Compressor lifetime	24	years	Jens et al., 2021
All pipelines	Electricity demand	0.000614	kWh/kg H2/km	Jens et al., 2021
Large pipeline	Maximum capacity	13	GW	Jens et al., 2021
Large pipeline	Pipeline capex	2,800,000	€/km	Jens et al., 2021
Large pipeline	Compressor capex	620,000	€/km	Jens et al., 2021
Medium pipeline	Maximum capacity	4.7	GW	Jens et al., 2021
Medium pipeline	Pipeline capex	2,200,000	€/km	Jens et al., 2021
Medium pipeline	Compressor capex	310,000	€/km	Jens et al., 2021
Small pipeline	Maximum capacity	1.2	GW	Jens et al., 2021
Small pipeline	Pipeline capex	90,000	€/km	Jens et al., 2021
Small pipeline	Compressor capex	90,000	€/km	Jens et al., 2021

Water parameters:

Type	Parameter	Value	Units	Ref.
Freshwater	Treatment electricity demand	0.4	kWh/m^3 water	US Dept. of Energy, 2016
Ocean water	Treatment electricity demand	3.7	kWh/m^3 water	Patterson et al., 2019
All water	Transport cost	0.1	€/100 km/m^3 water	Zhou and Tol, 2005
All water	Water specific cost	1.25	€/m^3 water	Wasreb, 2019
All water	Water demand	21	L water/kg H2	Taibi et al., 2020

Country-specific parameters:

Country	Parameter	Value	Units	Ref.
Namibia	Electricity price	0.10465	€/kWh	GlobalPetrolPrices.com
Namibia	Heat price	0.02	€/kWh	Assumption
Namibia	Solar interest rate	6	%	Assumption
Namibia	Solar lifetime	20	years	Assumption
Namibia	Wind interest rate	6	%	Assumption
Namibia	Wind lifetime	20	years	Assumption
Namibia	Plant interest rate	6	%	Assumption
Namibia	Plant lifetime	20	years	Assumption
Namibia	Infrastructure interest rate	6	%	Assumption
Namibia	Infrastructure lifetime	50	years	Müller et al., 2022