EPM Output Overview

The postprocessing pipeline reads the GAMS run artifacts located under each scenario folder (for example output/<run_id>/<scenario>/). Two types of result files are produced when the model is executed with REPORTSHORT = 0:

• epmresults.gdx – the complete data dump written by the execute_unload statement in generate_report.gms.

• Comma-separated files created by the embedded GAMS Connect block in generate_report.gms. Each CSV mirrors the identically named GDX symbol and is stored next to the scenario GDX file.

Unless stated otherwise, the columns epmresults.gdx and CSV export indicate whether each symbol is produced by default when REPORTSHORT = 0.

Tips

• Large CSVs can be slimmed down using reduce_definition_csv in postprocessing.py (keeps first, middle, last year).

• When REPORTSHORT = 1, only pYearlyCostsZone, pYearlyCostsZoneFull, and pEnergyBalance are exported; the tables below assume the default detailed reporting.

1. CAPACITY

Variable	Description	epmresults.gdx	CSV export
pCapacityPlant	Installed capacity [MW] by plant, zone, and year	Yes	Yes
pCapacityTechFuel	Installed capacity [MW] by technology, fuel, and zone	Yes	No
pCapacityFuel	Installed capacity [MW] by fuel and zone	Yes	Yes
pCapacityTechFuelCountry	Installed capacity [MW] by technology, fuel, and country	Yes	No
pCapacityFuelCountry	Installed capacity [MW] by fuel and country	Yes	Yes
pCapacityPlantH2	Installed electrolyzer capacity [MW] by zone and year	Yes	No
pRetirementsPlant	Retired capacity [MW] by plant, zone, and year	Yes	No
pRetirementsFuel	Retired capacity [MW] by fuel and zone	Yes	No
pRetirementsCountry	Total retired capacity [MW] by country and year	Yes	No
pRetirementsFuelCountry	Retired capacity [MW] by fuel and country	Yes	No
pNewCapacityFuel	Newly added capacity [MW] by fuel and zone	Yes	Yes
pNewCapacityTech	Newly added capacity [MW] by technology and zone	Yes	No
pNewCapacityFuelCountry	Newly added capacity [MW] by fuel and country	Yes	Yes
pNewCapacityTechCountry	Newly added capacity [MW] by technology and country	Yes	No
pAnnualTransmissionCapacity	Total available transmission capacity [MW] between internal zones	Yes	Yes
pNewTransmissionCapacity	Additional transmission capacity [MW] between internal zones	Yes	Yes
pCapacitySummary	Summary of capacity indicators [MW] by zone and year	Yes	Yes
pCapacitySummaryCountry	Summary of capacity indicators [MW] by country and year	Yes	Yes

2. COSTS

Variable	Description	epmresults.gdx	CSV export
pCostsPlant	Yearly cost breakdown by plant and year	Yes	Yes
pCapexInvestment	Annual CAPEX investment [USD] by zone and year	Yes	Yes
pCapexInvestmentPlant	CAPEX investment [USD] by plant and component	Yes	Yes
pCapexInvestmentTransmission	Transmission CAPEX [USD] by line and year	Yes	Yes
pCapexInvestmentComponent	Annual CAPEX investment [USD] by component and zone	Yes	Yes
pPrice	Marginal cost [USD/MWh] by zone, time, and year	Yes	Yes
pImportCostsInternal	Import costs with internal zones [USD] by zone and year	Yes	No
pExportRevenuesInternal	Export revenues with internal zones [USD] by zone and year	Yes	No
pCongestionRevenues	Congestion rents [USD] from saturated internal lines by year	Yes	No
pTradeSharedBenefits	Congestion rents shared equally between zones [USD]	Yes	No
pYearlyCostsZone	Annual cost summary [million USD] by zone and year	Yes	Yes
pYearlyCostsCountry	Annual cost summary [million USD] by country and year	Yes	Yes
pCostsZone	Total cost [million USD] by zone and cost category	Yes	No
pCostsSystem	System-level cost summary [million USD], weighted and discounted	Yes	Yes
pCostsSystemPerMWh	System-level cost summary [USD/MWh], weighted and discounted	Yes	Yes
pYearlyCostsSystem	Annual system cost summary [million USD] by cost category and year	Yes	No
pFuelCosts	Annual fuel costs [million USD] by fuel, zone, and year	Yes	Yes
pFuelCostsCountry	Annual fuel costs [million USD] by fuel, country, and year	Yes	Yes
pFuelConsumption	Annual fuel consumption [MMBtu] by fuel, zone, and year	Yes	No
pFuelConsumptionCountry	Annual fuel consumption [MMBtu] by fuel, country, and year	Yes	No

3. ENERGY BALANCE

Variable	Description	epmresults.gdx	CSV export
pEnergyPlant	Annual energy generation [GWh] by plant, zone, and year	Yes	Yes
pEnergyTechFuel	Annual energy generation [GWh] by technology, fuel, and zone	Yes	No
pEnergyFuel	Annual energy generation [GWh] by fuel and zone	Yes	Yes
pEnergyTechFuelCountry	Annual energy generation [GWh] by technology, fuel, and country	Yes	No
pEnergyFuelCountry	Annual energy generation [GWh] by fuel and country	Yes	Yes
pEnergyBalance	Annual supply-demand balance [GWh] by zone	Yes	Yes
pEnergyBalanceCountry	Annual supply-demand balance [GWh] by country	Yes	No
pEnergyBalanceH2	Annual hydrogen supply-demand balance [mmBTU] by zone	Yes	No
pEnergyBalanceCountryH2	Annual hydrogen supply-demand balance [mmBTU] by country	Yes	No
pUtilizationPlant	Annual plant utilization factor	Yes	Yes
pUtilizationTech	Annual technology utilization factor	Yes	No
pUtilizationFuel	Annual average capacity factor by fuel	Yes	Yes
pUtilizationTechFuel	Annual average capacity factor by technology and fuel	Yes	Yes
pUtilizationFuelCountry	Annual average capacity factor by fuel and country	Yes	Yes
pUtilizationTechFuelCountry	Annual average capacity factor by technology, fuel, and country	Yes	Yes

4. ENERGY DISPATCH

Variable	Description	epmresults.gdx	CSV export
pDispatchPlant	Plant-level hourly dispatch and reserve [MW]	Yes	No
pDispatchFuel	Fuel-level hourly dispatch [MW]	Yes	Yes
pDispatch	Zone-level hourly dispatch and flows [MW]	Yes	Yes

5. RESERVES

Variable	Description	epmresults.gdx	CSV export
pReserveSpinningPlantZone	Spinning reserve provided by plant [MWh] per zone and year	Yes	Yes
pReserveSpinningFuelZone	Spinning reserve provided by fuel [MWh] per zone and year	Yes	Yes
pReserveSpinningPlantCountry	Spinning reserve provided by plant [MWh] per country and year	Yes	Yes
pReserveMargin	Reserve margin indicators by zone and year	Yes	No
pReserveMarginCountry	Reserve margin indicators by country and year	Yes	No

6. INTERCONNECTIONS

Variable	Description	epmresults.gdx	CSV export
pInterchange	Annual energy exchanged [GWh] between internal zones	Yes	Yes
pInterconUtilization	Interconnection utilization [%] between internal zones	Yes	Yes
pLossesTransmission	Transmission losses [MWh] per internal zone	Yes	No
pInterchangeCountry	Annual energy exchanged [GWh] between countries	Yes	Yes
pLossesTransmissionCountry	Transmission losses [MWh] per country	Yes	No
pCongestionShare	Share of time congested [%] for line z–z2	Yes	Yes
pHourlyInterchangeExternal	Hourly external trade [MW] per zone	Yes	No
pYearlyInterchangeExternal	Annual external trade [GWh] per zone	Yes	No
pYearlyInterchangeExternalCountry	Annual external trade [GWh] per country	Yes	No
pHourlyInterchangeExternalCountry	Hourly external trade [MW] per country	Yes	No
pInterchangeExternalExports	Annual exports [GWh] from zone to external zone	Yes	No
pInterchangeExternalImports	Annual imports [GWh] from external zone	Yes	No
pInterconUtilizationExternalExports	External export line utilization [%]	Yes	No
pInterconUtilizationExternalImports	External import line utilization [%]	Yes	No

7. EMISSIONS

Variable	Description	epmresults.gdx	CSV export
pEmissionsZone	CO₂ emissions [Mt] by zone and year	Yes	Yes
pEmissionsIntensityZone	CO₂ intensity [tCO₂/GWh] by zone and year	Yes	Yes
pEmissionsCountrySummary	CO₂ emissions [Mt] by country, type, and year	Yes	No
pEmissionsIntensityCountry	CO₂ intensity [tCO₂/GWh] by country and year	Yes	No
pEmissionMarginalCosts	Marginal cost of system emission constraint [USD/tCO₂]	Yes	No
pEmissionMarginalCostsCountry	Marginal cost of country emission constraint [USD/tCO₂]	Yes	No

8. PRICES

Variable	Description	epmresults.gdx	CSV export
pYearlyPrice	Demand-weighted average electricity price [USD/MWh] by zone and year	Yes	No
pYearlyPriceExport	Flow-weighted average export price [USD/MWh] by zone and year	Yes	No
pYearlyPriceImport	Flow-weighted average import price [USD/MWh] by zone and year	Yes	No
pYearlyPriceHub	Flow-weighted hub price [USD/MWh] by zone and year	Yes	No
pYearlyPriceCountry	Demand-weighted average electricity price [USD/MWh] by country and year	Yes	No
pYearlyPriceExportCountry	Flow-weighted average export price [USD/MWh] by country and year	Yes	No
pYearlyPriceImportCountry	Flow-weighted average import price [USD/MWh] by country and year	Yes	No

9. SPECIAL TECHNOLOGIES

Variable	Description	epmresults.gdx	CSV export
pCSPBalance	CSP hourly output by type [MW]	Yes	No
pCSPComponents	CSP installed components and metrics	Yes	No
pPVwSTOBalance	PV+Storage hourly output by type [MW]	Yes	No
pPVwSTOComponents	PV+Storage installed components and metrics	Yes	No
pStorageBalance	Generic storage hourly output [MW] and storage level	Yes	No
pStorageComponents	Generic storage installed capacity [MW, MWh] and storage hours	Yes	No
pSolarPower	Solar hourly output [MWh]	Yes	No
pSolarEnergyZone	Annual solar energy [MWh] by zone	Yes	No
pSolarValueZone	Average market value of solar [USD/MWh] by zone	Yes	No
pSolarCost	Levelized cost of solar [USD/MWh] by zone	Yes	No

10. METRICS

Variable	Description	epmresults.gdx	CSV export
pPlantAnnualLCOE	Plant-level LCOE [USD/MWh] by year	Yes	Yes
pCostsZonePerMWh	Zone discounted average cost by component [USD/MWh]	Yes	Yes
pCostsCountryPerMWh	Country discounted average cost by component [USD/MWh]	Yes	No
pDiscountedDemandZoneMWh	Discounted electricity demand denominator [MWh] by zone	Yes	No
pDiscountedDemandCountryMWh	Discounted electricity demand denominator [MWh] by country	Yes	No
pDiscountedDemandSystemMWh	Discounted electricity demand denominator [MWh] for the system	Yes	No
pYearlyCostsSystemPerMWh	System average cost [USD/MWh] by year	Yes	No

11. modeltype PARAMETERS

Variable	Description	epmresults.gdx	CSV export
pSolverParameters	modeltype status, time, and gap diagnostics	Yes	No

pSolverParameters includes entries such as modeltype Status, modeltype Time: ms, Absolute gap, and Relative gap.

OTHER OUTPUTS & AUXILIARY VARIABLES

Variable	Description	epmresults.gdx	CSV export
pSettings	Model configuration and run settings	Yes	Yes
zcmap	Zone-to-country mapping	No	Yes
pVarCost	Variable cost inputs by generator/fuel	Yes	No
pCapacityCredit	Capacity credit factors by generator	Yes	Yes