This paper aims to analyze the inaccuracies occurred in "Hybrid DE-SQP algorithm for non-convex short term hydrothermal scheduling problem" by S. Sivasubramani and K. Shanti Swarup [Energy Conyers. Manage. 52 (2011) 757-761]. The original paper Sivasubramani and Shanti Swarup (2011) has proposed the differential evolution (DE) and sequential quadratic programming (SQP) method to solve the non-convex short term hydrothermal scheduling problem, but the offered solution is not satisfactory, while considering the constraints of reservoir storage volume, the ultimate reservoir storage volumes of hydro-units and the power produced by such units. (C) 2015 Elsevier Ltd. All rights reserved.