Market parameters dependent indices for competition evaluation in electricity market

摘要

Typical market share indices are rarely suitable for market power measurement in electricity markets since they do not take into account major market features. This leads to the necessity of developing new or modification of existing instruments. In this paper, we study and assess outcomes of typical market share indices, and variations of Residual Supply Index (RSI). We propose a new market parameters dependent index (PDI) and a corresponding methodology, which as well relies on residual demand, demand elasticity, and incorporates a threshold value of price rise. We implement statistical methods on market data to derive values of indices and the relation between RSI and PDI. Then we formulate the conditions when the indices provide appropriate results and give them justification.