| 2019 | [
  #<Node energy_heat_boiler_ht_electricity>,0
  #<Node energy_heat_boiler_lt_electricity>,1
  #<Node energy_heat_boiler_mt_electricity>,2
  #<Node energy_heat_heatpump_drink_water_water_ts_lt_electricity>,3
  #<Node energy_heat_heatpump_drink_water_water_ts_mt_electricity>,4
  #<Node energy_heat_heatpump_surface_water_water_ts_lt_electricity>,5
  #<Node energy_heat_heatpump_surface_water_water_ts_mt_electricity>,6
  #<Node energy_heat_heatpump_waste_water_water_ts_lt_electricity>,7
  #<Node energy_heat_heatpump_waste_water_water_ts_mt_electricity>,8
  #<Node energy_heat_heatpump_water_water_ht_electricity>,9
  #<Node energy_heat_heatpump_water_water_lt_electricity>,10
  #<Node energy_heat_heatpump_water_water_mt_electricity>,11
] | nodes | 
| 2050 | [
  #<Node energy_heat_boiler_ht_electricity>,0
  #<Node energy_heat_boiler_lt_electricity>,1
  #<Node energy_heat_boiler_mt_electricity>,2
  #<Node energy_heat_heatpump_drink_water_water_ts_lt_electricity>,3
  #<Node energy_heat_heatpump_drink_water_water_ts_mt_electricity>,4
  #<Node energy_heat_heatpump_surface_water_water_ts_lt_electricity>,5
  #<Node energy_heat_heatpump_surface_water_water_ts_mt_electricity>,6
  #<Node energy_heat_heatpump_waste_water_water_ts_lt_electricity>,7
  #<Node energy_heat_heatpump_waste_water_water_ts_mt_electricity>,8
  #<Node energy_heat_heatpump_water_water_ht_electricity>,9
  #<Node energy_heat_heatpump_water_water_lt_electricity>,10
  #<Node energy_heat_heatpump_water_water_mt_electricity>,11
] | nodes |