The energy economics of potato and gram crop production operation in Allahabad region is reported in the present study. The main focus of this study was to study the operation and source wise energy inputs for potato and gram crop under traditional and partial mechanized farming system and to analyze and compare the cost benefits of partial mechanised farming over traditional farming. The various operations in the production of crops like sowing, intercultural and harvesting and picking were considered for the operation energy input determination. It was observed that in both crop energy required in sowing, intercultural and harvesting/picking operation was more in traditional farming. It means that mechanized farming saves the much more energy input in operation and reduces the cost. After analyzing the cost of energy, it was clear that the cost of energy is 1.2 times more in gram crop for traditional farming as compared to mechanized farming. But in potato crop, the cost of energy approx doubles in traditional as compared to mechanized farming. It was also found that mechanized farming of gram crop and potato crop shows the significant saving in operational energy as well.