04 Fakultät Energie-, Verfahrens- und Biotechnik

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    Impact of Transmission Network Investments on Market Power in the German Electricity Market
    (2005) Ellersdorfer, Ingo
    In this paper a model based analysis of competition in the German wholesale electricity market is presented. Applying a multi-regional model which covers the interregional transmission constraints between Germany and its neighboring countries, potential for exercising market power by the four dominant electricity producers has been found. Assuming Cournot behavior in the spot market, it has been analyzed to what extent network investment can lead to enhanced competition. It has also been shown that the impact of transmission reinforcement on market power differs among interconnection lines due to the specific supply and demand structures within the considered markets.
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    Emission trading vs. renewable energy technology promotion for GHG control in the European Union : effectiveness, economic costs, and security of supply
    (2007) Küster, Robert; Zürn, Marcel; Ellersdorfer, Ingo; Fahl, Ulrich
    Policy instruments for GHG abatement may follow different strategies. Two prominent distinct strategies that are also part of the EU climate protection approach are market oriented cap and trade regimes and support schemes for carbon free generation technologies. The two strategies differ in their impact on the energy system and thus in effectiveness of abatement, in economic impact, and in consequences for energy security. We contrast the EU-wide impacts of two policy instruments each representing a single control strategy by using the recursive-dynamic, technology rich CGE model NEWAGE-W. First, we consider a cap and trade regime where international emission allowance trade is implemented following the Kyoto-protocol. Second, we consider targets for the application of renewable energy sources in electricity generation. Our model results suggest that for reasons of effectiveness, economic efficiency, and security of supply a GHG control strategy should not merely rely on technology oriented policies. Combining a technology oriented strategy with a cap and trade strategy may only slightly further decrease emissions where this reduction is accompanied by negative growth impacts. Impacts differ between new and old member states and are highly sensitive to the allocation of the overall EU target.