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The beneficts of transmission expansions in the competitive electricity markets

pubblicazioni - Memoria

The beneficts of transmission expansions in the competitive electricity markets

In response to the new needs of the transmission planning process for the competitive electricity markets, a novel method for assessing simultaneously the technical and economic benefits of transmission expansions is here presented.

The rationale of the method stems from the acknowledgement that, under a social perspective, the benefits of major transmission expansions are: a) improved reliability, b) increased availability of efficient supply often referred to as “substitution effect” and c) increased competition among suppliers often referred to as “strategic effect”. The main elements of the methodology and of the related tool REMARK are: probabilistic simulation of one year of operation of an electric power system using the non- sequential Monte Carlo method; full network representation adopting the simplified direct current model; quantitative assessment of the reliability benefits through the Expected Energy Not Supply (EENS) index; simulation of the strategic behaviour of suppliers using a simplified model that correlates the price-cost mark-up to the structural parameters Residual Supply Index (RSI) and demand; quantitative assessment of substitution and strategic effects through the Social Welfare Indicator. In addition to the overall social perspective, the method can assess the benefits of transmission expansions for each market zone as well as separately for consumers, producers and TSOs.

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