出版社：Energiewirtschaftliches Institut an der Universität zu Köln
摘要：The paper at hand examines the power system costs when a coal tax ora xed bonus for renewables is combined with CO2 emissions trading. Itexplicitly accounts for the interaction between the power and the gas marketand identi es three cost e ects: First, a tax and a subsidy both causedeviations from the cost-ecient power market equilibrium. Second, thesepolicies also impact the power sector's gas demand function as well as thegas market equilibrium and therefore have a feedback e ect on power generationquantities indirectly via the gas price. Thirdly, by altering gas prices,a tax or a subsidy also indirectly a ects the total costs of gas purchase bythe power sector. However, the direction of the change in the gas price, andtherefore the overall e ect on power system costs, remains ambiguous. Ina numerical analysis of the European power and gas market, I nd using asimulation model integrating both markets that a coal tax a ects gas pricesambiguously whereas a xed bonus for renewables decreases gas prices. Furthermore,a coal tax increases power system costs, whereas a xed bonus candecrease these costs because of the negative e ect on the gas price. Lastly,the more market power that gas suppliers have, the stronger the outlinede ects will be.
关键词：CO2 abatement; oligopoly; gas market; power market
