The purpose of this paper is to present the multidimensional issue of an “energy transition” from a philosophical, i.e. conceptual and analytical, point of view. The argument of this paper is that “energy transition” is not simply a technological and economic problem, but also an epistemological, cultural, anthropological and even metaphysical one. Energy transition does not only consist of changing the kind of energy that is produced and consumed to power our modern middle-income societies, from fossil-fuels to renewable energies. Energy transition asks us to understand what is implied in cultural and social terms by such a shift from“grey” to “green” sources of energy that does not only entail qualitative transformation, but also could imply quantitative curtailment. What will be the consequences of our necessary departure from “petromodernity”, i.e. from the mode of living that came with fossil-fuels in modern times that shape our current age of the Anthropocene? To address this question, different dimensions of the philosophy of energy will be studied: epistemological, phenomenological,anthropological, critical and metaphysical. In conclusion, we will, first, propose the notion of a “negative energy tax” to address the problems of “energy injustice”. We will then refer to Bataille to provide an ontology of energy that can help to redefine our assumptions and expectations regarding energy spending.