The Contracted Power Optimization feature enables you to calculate the potential tariff optimization for each of your main electricity meters. This calculation is primarily based on your consumption from the previous year and the TURPE (Tariff for Using the Public Electricity Network). This article details how the platform performs this calculation.


TABLE OF CONTENTS


Definition of Contracted Power and Optimization Principle


Bill Breakdown


An electricity bill can be divided into three parts:

  1. Supply: The number of kWh consumed.
  2. Delivery: The cost of transport and distribution.
  3. Taxes: Electricity-specific taxes and VAT.

The contracted power optimization algorithm affects the delivery and taxes, which depend on:

  • Contract data
  • Consumption data
  • TURPE (Tariff for Using the Public Electricity Network), which changes annually: enedis-essentiel-turpe6.pdf


All this information is retrieved from Enedis for a given meter.



Contracted Power


The contracted power of a meter corresponds to the maximum allowed power for a meter within a time-of-use rate band.

  • The higher the contracted power, the more expensive the delivery.
  • Exceeding the contracted power incurs overage costs.



Contracted power optimization seeks to find the balance between delivery costs and overage costs to identify the cheapest contract. To do this, different types of contracts are calculated, assuming the user will consume exactly as they did the previous year.


Calculation of Delivery Costs


Breakdown by Component

  • Management Component: Annual value depending on the meter's contract.
  • Metering Component: Annual value depending on the meter's contract.
  • Withdrawal Component:
    • Fixed Part: Value dependent on the Contracted Powers in the contract = b1 × P1 + Σ[ bi . (Pi - Pi-1)]
    • Variable Part: Value dependent on Called Powers during the calculation period. We calculate the energy consumed from the load curve by dividing the sum of all powers for a period i by 6 (to convert kW to kWh). For each component i, we multiply the coefficient ci by the energy Ei consumed during this period, then sum everything = Σ ci . Ei.




  • Overage Component: Value dependent on Called Powers and Contracted Powers.

The total delivery cost is the sum of Fixed Part, Variable Part, and Overage.

  • Delivery Tariff Contribution (CTA): Electricity-specific tax dependent on the fixed part = total fixed part * 21.93%, regardless of the contract.
  • Tax on Final Electricity Consumption (TCFE): Local taxes depending on the meter's department and municipality = total energy consumed * coefficient depending on the municipality.

Example :



Meter




Tariff for Using the Public Electricity Network (TURPE)



Recalculation of Delivery Tariff

  • Current Contract:
    • CG = 188.28
    • CC = 204.24
    • CS (Fixed Part) = 2.82×54+(8.94(54-54)+7.99(54-54)+6.40(54-54)=692.28
    • CS (Variable Part) = 5.28×23341+3.64×8495+2.28×56815+1.73×20403=3189.97
    • CMDPS = 54.35
  • Optimized Contract:
    • CG = 188.28
    • CC = 204.24
    • CS (Fixed Part) = 12.82×37+(8.94(49-37)+7.99(53-49)+6.40(57-53)=639.18
    • CS (Variable Part) = 5.28×23341+3.64×8495+2.28×56815+1.73×20403=3189.97
    • CMDPS = 17.53

The fixed part of the contracts will thus be the sum of CG, CC, and CS (Fixed Part).



The variable part will thus equal the variable part of CS.

Due to various changes in the electricity market, the TCFE is now integrated into the CSPE. Therefore, the amounts associated with the TCFE will be 0.

Only meters in BT Sup and HTA can be optimized. A meter in BT Inf will not be optimized for two reasons:

  • Part of the calculation relies on power overage, and BT Inf meters trip in case of overage.
  • The load curve data for C5 meters are 30-minute points, representing the average power received over the last 30 minutes. This results in too much uncertainty and skews the calculation.

Optimized contracts may suggest a change in Tariff Version (FTA) but not voltage levels. This is because changing voltage levels would require network upgrade work, incurring additional costs.

To ensure the calculation can be performed for your delivery points, configuration rules must be followed. You can refer to this article for details.