PSPLIB-ENERGY: a PSPLIB extension for evaluating energy optimization in MRCPSP. PSPLIB-ENERGY library is an extension of the Project Scheduling Problem Library - PSPLIB to provide problem sets for evaluation of energy optimization in the multi-mode resource-constrained project scheduling problems. Data of activities, durations and resource requeriments are the same, as they are obtained from PSPLIB. Each activity can be performed under different energy requeriments. Each alternative energy consumption by the activity involves different duration of execution. The goal of solving methods is to plan the sequence of activities and energy consumption of each activity in order to maximice energy efficiency (i.e.: minimize the combination of makespan and energy consumption) of projects.