Russia’s unprovoked invasion of Ukraine has had a dramatic impact on the global energy system. Russia was the world’s largest oil and natural gas exporter in 2021, and energy markets have been thrown into turmoil, with major energy security and supply risks worldwide. Substantial gas...

The paper at hand examines the power system costs when a coal tax or a fixed bonus for renewables is combined with CO2 emissions trading. It explicitly accounts for the interaction between the power and the gas market and identifies three cost effects: First, a tax and a subsidy both cause...