The cultivation of industrial crops stands out as an alternative strategy for fossil fuels. However, it is important to ensure that the production of energy crops is not a threat to the production of food and feed, competing for land or water. This work was based on a bibliographical review of studies and projects that studied the potential for growing energy crops in marginal soils and the hypothesis of them being irrigated with wastewater. In fact, the use of land that no longer has the capacity for agriculture results in not only economic benefits but also environmental and economic ones. On the other hand, irrigation through the reuse of treated wastewater reduces pressure on water resources and adds the advantage of being able to deliver nutrients to energy crops. Irrigating energy plants with treated wastewater, from a proximity perspective with a defined area of 10 km in radius, allows some places to overcome the water needs of plants, leaving water for purposes other than energy generation.