It is difficult to elminated all market power in electricity markets and it is therefore frequently suggested that some market power should be tolerated: extra revenues contribute to fixed cost recovery,facilitate investment and increase security of supply. This suggestion implicitly assumes all generation technologiesbenefit equally from market power. We assess a mixture of conventional and intermittent generation, eg coal plants and wind power. If all output is sold in the spot market, then intermittent generation benefits less frommarket power than conventional generation. Forward contracts or option contracts reduce the levelof market power but bias against intermittent generators persists
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