Configuration

The FGEM workflow requires the user to input a configuration file to describe the project components, i.e., metadata, finanical parameters, subsurface reservoir, wellbore, weather, power plant, energy storage (thermal and/or electrochemical), and power markets (wholesale, capacity, green credits, and/or PPA). For a given run, only the relevant components are required to be configured. FGEM validates the input configuration and sets default paramters where paramters are missing. FGEM then simulates the project lifetime, stores records, computes economics, and visualizes data. Herein, we describe the main configuration paramters.

metadata

	Unit	Values	Description	Default
time_init		str	project start date	“2025-01-01”
L	years	int	project lifetime	30
d		float	nominal discount rate	0.07
inflation		float	inflation rate	0.02
itc		float	investment tax credit, which is assumed to be recovered from the total project capital expenditure.	0.3
project_data_dir		str	If data were to be used, this variable indicates the directory where it can be found	./data/sample_project

subsurface

	Unit	Values	Description	Default
drilling_cost	USD/meter	bool	geothermal well drilling cost in USD/meter. If not specified, correlations are used to estimate drilling cost as a function of measured depth.
reservoir_type		str	type of reservoir model. Options are (1) “percentage_decline” for PercentageDecline, (2) “energy_decline” for EnergyDecline, (3) “diffusion_convection” for DiffusionConvection, and (4) “uloop” for ULoop. For simulating conventional geothermal or enhanced geothermal systems, we recommend “diffusion_convection” as it is an anlytical solution. Models “percentage_decline” and “energy_decline” are conceptual. Meanwhile, “uloop” is used to simulate U-Loop closed loop systems.	“diffusion_convection”
Tres_init	deg C	float	initial reservoir temperature	225
Pres_init	bar	float	initial reservoir pressure	40
V_res	\(m^3\)	float	bulk reservoir volume	5
phi_res		float	reservoir porosity	0.1
res_thickness	meters	float	reservoir thickness	300
krock	W/m-K	float	reservoir themral conductivity	30
drawdp		float	property of the PercentageDecline reservoir model indicating the fixed annual rate at which reservoir temperature declines	0.005
plateau_length	years	float	property of the PercentageDecline reservoir model indicating the fixed number of years for which the reservoir temperature does not drop initially.	3
rock_energy_recovery		float	property of the EnergyDecline reservoir model indicating the recovarable fraction of the total heat contained in the bulk rock volume in the subsurface.	1
surface_temp	deg C	float	near-surface temperauture (it could be identical to the ambient temperature)	20
well_depth	meters	float	true vertical depth of production and injection wells.	3000
prd_well_diam	meters	float	diameter of production wells.	0.3115
inj_well_diam	meters	float	diameter of injection wells.	0.3115
numberoflaterals		int	number of laterals for each producer-injector doublet.	1
num_prd		int	total number of producers in the project.
inj_prd_ratio		float	ratio of injector-to-producer wells in the project.	1
waterloss		float	fraction of water that is lost to the reservoir.	0.05
pumpeff		float	efficiency of production and injection pumps	0.75
DSR		float	drilling success rate	1
SSR		float	well stimulation success rate	1
PI	kg/s/bar	float	injectivity at production wells	20
II	kg/s/bar	float	injectivity at injection wells	20
lateral_diam	meters	float	property of the Uloop reservoir model indicating when the lateral diameter to allow for it to be different from the diameter of the vertical sections at the producer and injector.	0.3115
lateral_spacing	meters	float	property of the Uloop reservoir model indicating the spacing between each two laterals	100
closedloop_design		str	property of the Uloop reservoir model indicating the closedloop design to be used. If set to “default”, it constructs typical multilateral Uloop systems. If set to “eavor”, it constructs a design similar to what is proposed by Eavor Deep 2.0.
dx	meters	int	property of the Uloop reservoir model indicating the size of each mesh cell for the numerical solution.
ramey		bool	whether or not to use Ramey’s heat loss/gain across the wellbore.	FALSE
reservoir_simulator_settings		dict	advanced settings used to expedite the reservoir simulation runs by enhancing or decreasing the timeframe at which the reservoir module is updated.
reservoir_filename		str	CSV file with tabular reservoir data including three columns [“Date”, “Tres_deg_C”, “m_kg_per_sec”] to indicate timestamp, reservoir temperature, and total field flow rate. (one value per year throughout the project lifetime). For instance, refer to examples/data/market/reservoir.csv

powerplant

	Unit	Values	Description	Default
powerplant_interconnection_cost	USD/kW	float	capital cost for power plant grid interconnection	130
powerplant_type		str	type of power plant. Options: (1) “Flash” for single flash power plant , (2) “Binary” for subcritical ORC power plant	“Binary”
powerplant_capacity	MW	float	power plant nameplate capacity	10
cf		float	powerplant capacity factor related to regular maintenance. Note that this does not include decrease in capacity factors due to ambient temperautre variations, reservoir temperature decline, etc.	0.99
pipinglength	km	float	length of piping network required for the power plant	5
bypass		bool	whether or not bypassing the power plant or turbine is allowed in this simulation. If set to True, it automatically bypasses flow away from power plant during hours of negative pricing. It also allows the user to specify other occasios when to bypass the power plant as desired.	FALSE

market

	Unit	Values	Description	Default
ambient_temperature	deg C	float	ambient temperature	20
weather_filename		str	CSV file with hourly weather data for one full year (i.e., total of 8760 horus) . For instance, refer to examples/data/market/weather.csv
energy_price	USD/MWh	float	energy price	40
recs_price	USD/MWh	float	value of renewable energy credits (RECs) or green credits	10
capacity_price	USD/kW-year	float	capacity value	100
energy_market_filename		str	CSV file with energy market data, spanning the entire project lifetime. For instance, refer to examples/data/market/wholesale.csv
capacity_market_filename		str	CSV file with capacity value (one value per year throughout the project lifetime). For instance, refer to examples/data/market/capacity.csv
fat_factor		float	multiplier of mean diversion to make the arbitrage opportunity more pronounced in wholesale power markets. Value of 1.0 means that this parameter has no effect.	1
resample		str	timeframe to which project market data is resampled (Options: “1Y”, “1m”, “1w”, “1d”, “1h” for yearly, monthly, weekly, daily, or hourly timestepping)	None

battery

	Unit	Values	Description	Default
battery_interconnection_cost	USD/kW	float	capital cost for battery grid interconnection
battery_energy_cost	USD/MWh	float	battery energy capital cost	200
battery_power_cost	USD/kW	float	battery power capital cost	300
battery_fom	USD/kW	float	battery annual fixed operation expenditure	10
battery_energy_augmentation	USD/MWh	float	battery energy augmentation cost, such that the battery efficiency does not change throughout its lifetime thanks to spending this augmentation cost	3
battery_power_augmentation	USD/kW	float	battery power augmentation cost, such that the battery efficiency does not change throughout its lifetime thanks to spending this augmentation cost	0.5
battery_elcc		float	battery effective load carrying capacity	1
battery_lifetime	years	int	battery lifetime	15
battery_roundtrip_eff		float	battery roundtrip efficiency	0.85
battery_duration	[hrs, hrs]	list	battery duration for two units where the second battery unit is installed after the first is retired.	[0, 0]
battery_power_capacity	[MW, MW]	list	battery power capacity for two units where the second battery unit is installed after the first is retired.	[0, 0]
battery_costs_filename		str	CSV file with battery costs and effective load carrying capacity (i.e., one set of values for each year throughout the project lifetime). For instance, refer to examples/data/market/battery.csv

tank

	Unit	Values	Description	Default
tank_cost	\(USD/m^3\)	float	capital cost for thermal energy storage tank	0.00143453
tank_diameter	m	float	diameter of the thermal energy storage tank	0
tank_height	m	float	height of the thermal energy storage tank	0