Self-Sufficiency and Self-Consumption

Self-sufficiency rate refers to the share (expressed in percentage terms) of a home’s or community’s energy demand produced (and self-consumed) locally calculated over a defined time frame (weekly or monthly). Self-sufficiency rate is calculated as follows:

self_sufficiency(market) = self_consumed_energy / total_energy_demanded

Self-consumption rate refers to the share of energy (expressed in percentage terms) that the home or the community consumes from its own production calculated over a defined time frame (weekly or monthly). Self-consumption rate is calculated as follows:

self_consumption(market) = self_consumed_energy / total_energy_produced

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Figure 3.5: Example of Self-Sufficiency and Self-Consumption Results in Grid Singularity’s interface (Singularity Map)

Here is an example of the self sufficiency and self consumption rate calculation:

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Figure 3.6: Example setup showing an energy community consisting of two home markets with diverse assets

  • total_house1_pv_production = 10kWh
  • house1_pv → house1_load = 1kWh
  • house1_pv → house1_storage = 5kWh
  • house1_pv → house2_load = 4kWh
  • house1_storage → house1_load = 2kWh
  • house1_storage → house2_load = 3kWh
  • house1_self_consumer_energy = (house1_pv → house1_load) + (house1_pv → house1_storage → house1_load) = 1 + 2 = 3kWh
  • house1_total_energy_demanded (only includes the demanded energy from house1’s load asset) = 3kWh

In this example, self-sufficiency of the house 1 is self_sufficiency(house1) = house1_self_consumer_energy / house1_total_energy_demanded

  • self_sufficiency(house1) = 3 / 3 = 1 → 100%

Self-consumption of the house 1 is self_consumption(house1) = house1_self_consumer_energy / house1_total_energy_produced

  • self_consumption(house1) = 3 / 10 = 0.3 → 30%

In the Grid, the highest level of the hierarchy :

  • self_sufficiency = 10 / 10 = 1 → 100%
  • self_consumption = 10 / 10 = 1 → 100%