Skip to main content

Merit configuration

When querying future values of your scenario, the full energy graph is calculated to create your response. These calculations include setting up the electricity supply and demand merit order and subsequently clearing the electricity market for every hour in the year. The ETM uses a separate gem called merit that performs these hourly calculations and clears the market. You can read more about its workings here.

The merit gem can be installed and used as a stand-alone feature in any other project. If you wish to initialize your own version of the merit gem with data from an ETM scenario, you can use the following endpoint to extract the configuration the ETM merit order is initialized with.

The merit config object

The endpoint which provides information about the merit configuration will return the following two objects:

  • curves - an object containing all the curves used by the participants. Each curve is a key value pair, with the value being a list of 8760 data points.
  • participants - a list of all participants in the merit order for this scenario.

Each participant is an object containing all details neccesary to initialize the merit order with. All participants contain the following data:

  • key - the identifier of the participant.
  • type - which merit class the participant should be. You can find the different participant and flex classes in the gem.
  • curve - the key of the curve that the participant uses, to be found in the curves object. Is null if the participant has no curve. A curve is usually a load profile, except for interconnectors, where the curve is the price curve.

For dispatchables the following data is included:

  • marginal_costs - in euros / MWh
  • output_capacity_per_unit - in MW
  • number_of_units - number
  • availability - value between 0 and 1
  • fixed_costs_per_unit - in euros / unit
  • fixed_om_costs_per_unit - in euros / unit
  • full_load_hours - only when the participant contains a curve, value between 0 and 8670

The flexible participants include the following data:

  • marginal_costs - in euros / MWh
  • input_capacity_per_unit - in MW
  • output_capacity_per_unit - in MW
  • number_of_units - number
  • volume_per_unit - only for types of storage, in MWh
  • input_efficiency - only for types of storage, value between 0 and 1
  • output_efficiency - only for types of storage, value between 0 and 1
  • reserve_class - only for types of storage, type of reserve to use, either reserve, or simple_reserve
  • decay - only for types of storage, curve

And the users (consumers) contain:

  • total_consumption - only for types of total consumption, in MJ
  • load_curve - optional, curve
  • consumption_share - only for types of consumption loss, value between 0 and 1

Get the merit config for your scenario

Fetches the merit config for the scenario

GET /api/v3/scenarios/{scenario_id}/merit
Path parameters
  • scenario_id number the scenario ID
Example request
GET /api/v3/scenarios/12345/merit HTTP/2
Accept: application/json
Example response
"curves": {
"energy_power_solar_pv_solar_radiation.dynamic: solar_pv": [..],
"flat": [..]
"participants": [
"curve": "energy_power_solar_pv_solar_radiation.dynamic: solar_pv",
"type": "volatile",
"key": "energy_power_solar_pv_solar_radiation",
"marginal_costs": 0,
"output_capacity_per_unit": 28.23529411764706,
"number_of_units": 1224.9916666666666,
"availability": 0.98,
"fixed_costs_per_unit": null,
"fixed_om_costs_per_unit": null,
"full_load_hours": 867
"curve": "flat",
"type": "must_run",
"key": "energy_chp_coal_gas",
"marginal_costs": 149.72613137608266,
"output_capacity_per_unit": 148.21415840878325,
"number_of_units": 0.6402278815033505,
"availability": 0.9,
"fixed_costs_per_unit": null,
"fixed_om_costs_per_unit": null,
"full_load_hours": 6354.38233269404

The include_curves parameter

If you want the large curves object to be excluded from the response, you can opt out by setting the include_curves parameter to false. Please note that without the curves you will not be able to initialise Merit. However, if you only need information on all the participants, this parameter can be used to reduce the response time.