Öz The European Union (EU) and the United States of America (USA), as the most powerful economies in the world, have common history, ancestors, and many economical partnerships. However, there have always been competitive issues between two sides. By analyzing this competition from the historical window, such as it happened in the Second World War, USA and some of EU members (which can be assumed as the leader of EU, Germany for example) had to fight against each other that has been affecting the current situations in the background. On the contrary, during the Cold War they had accelerated economic relationships. Moreover, after the Cold War they had also maximized their economical partnership and decided to have a comprehensive trade agreement to increase this partnership to a higher level. For accomplishing such target, Transatlantic Trade and Investment Partnerships (TTIP) was announced by USA President.[1] And the announcement was later endorsed by the European Commission President Barroso. The first round of TTIP negotiations took place in the week of July 8 in Washington, D.C., under the leadership of the Office of the U.S. Trade Representative[2], and such negotiations are still continuing. During this period, the spy scandals occurred between EU and USA. Following that, the penalty for Volkswagen’s Emissions Scandal came out, then Brexit happened (while waiting for the negotiations). Currently European Union says Apple broke EU tax rules in Ireland, and another USA company, Mc Donald’s, is also about to face tax penalty in Luxemburg, but contrarily the USA files for toxic mortgages between 2005 and 2007 on Deutsche Bank.  In the light of explicit competition being escalated through political and economic issues between two allies, this study will try to focus on how it may affect their energy policies.