The thermoelectric power plant in Tula, Hidalgo, where Greenpeace Mexico is preparing to carry out an action in occasion of Earth Day 2021. Fuel oil is being burned in this plant with a 3.9 percent sulfur content by mass, exceeding the maximum limit established by the Official Mexican Standard NOM-016-CRE-2016, of 2 percent. Fuel oil is one of the fossil sources that emits the most greenhouse gases per kWh, 898gCO2.