In this study, the optimal and efficient price and investment for an energy-only market structure is derived in which price-insensitive consumers may have to be rationed under some contingencies. Then, it is proved that the resource adequacy problem could be mitigated under the achieved optimal price and investment planning. The German electricity market is studied as a case study and the optimal prices and investment patterns are discussed. The preliminary results show the correlation between the scarcity prices and frequency of scarcity situations and the volume of price-sensitive loads.
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