The aim of this study is to assess how the idea of decarbonisation and the energy transition by the oil and gas industry has been approached by the Brazilian Congress. To do this, we will analyze the shorthand notes from the General Assembly and Senate over the last five years. Our hypothesis is that the way congressmen perceive and communicate the issue of decarbonisation plays a fundamental role in the alternatives proposed for emissions reduction and energy transition in the country. Additionally, their views as opinion leaders have a significant influence on public perception towards or against alternatives and players. Therefore, we aim to map the discourses about decarbonisation and energy transition in the Brazilian Congress, especially concerning the oil and gas industry.