Power Flow Allocation in Electricity Markets

Power flow allocation refers to the set of methodologies by which the use of transmission and distribution networks is apportioned among market participants in liberalised electricity systems. It underpins the transparent identification of grid usage costs, ensures equitable recovery of network charges and informs congestion management. Core approaches range from physical tracing techniques, which follow the paths of electrical injections through a meshed network, to contractual schemes such as postage stamp and MW-mile methods that apportion costs by fixed tariffs or distance-weighted flows. The increasing penetration of variable renewable energy sources and distributed energy resources has heightened the complexity of allocation, necessitating dynamic models that account for uncertainty, contingency events and nodal technical losses. Recent advances integrate optimisation algorithms, stochastic sampling and regression techniques to enhance the granularity and fairness of allocation, while active power flow tracing and loss factor metrics support real-time operational decisions. Globally, robust allocation protocols are essential for incentivising efficient grid usage, facilitating cross-border trade and enabling emerging market designs that reward flexibility and low-carbon generation.

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Power Flow Allocation in Electricity Markets publication trend

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Technical terms

Power flow allocation: Methods to assign usage of transmission and distribution lines to market participants based on actual or contractual flows.

Power wheeling: The service of transmitting electricity from a generator to a distant consumer across one or more transmission systems.

Variable Renewable Energy (VRE): Renewable generators whose output fluctuates with natural resources, such as wind or solar.

Distributed Energy Resources (DER): Small-scale generation units or storage devices located close to load centres.

Technical losses: Energy losses inherent to power transfer due to resistance and reactive flows in conductors and transformers.

Postage stamp method: A tariff approach that charges all users the same fixed rate regardless of distance.

MW-mile method: A cost allocation method which multiplies megawatts delivered by distance travelled on the network.

Power flow tracing: A physical technique to follow contributions of individual injections through meshed networks.

References

1. Applied Power Wheeling Concept Considering Site-Specific and Variability of VRE under Contingency Events. Sustainability (2023).
2. Efficient Modeling of Distributed Energy Resources’ Impact on Electric Grid Technical Losses: A Dynamic Regression Approach. Energies (2024).
3. Power Flow Tracing for Active Congestion Management in Modern Power Systems. Energies (2020).
4. Voltage control loss factors for quantifying DG reactive power control impacts on losses and curtailment. IET Generation Transmission & Distribution (2022).