Despite the controversy and temporary inefficiency of some directions, the green economy, as well as one of its fundamental pillars—green energy, inevitably continues its development and consistently permeates into new areas of our lives. Moreover, one of the priority directions for further increasing the level of environmental safety in today’s economic systems remains the electrification of vehicles. The overwhelming majority of green energy projects have environmental and other effects (e.g., social, humanitarian, political, and others). This scientific-applied research focuses on the economic effect of business projects currently implemented in the field of green energy. Particularly, the authorial team presents proposals for optimizing the methodology for assessing the economic efficiency of green projects in the automotive industry, primarily those related to the electrification of automotive transport. Based on the results of the applied research, the authors developed a formula to conduct a quantitative comparative assessment of the cost equivalent of the actual energy consumption levels of electric cars and vehicles equipped with internal combustion engines.