Green scheduling of a two-machine flowshop: Trade-off between makespan and energy consumption.

•Introduced the concept of green scheduling as a new approach to shop floor scheduling.•Developed a novel multi-objective model to optimize energy consumption and makespan.•Defined lower bounds for the objectives and developed a heuristic for the problem.•Compared performance of the heuristic with CPLEX through statistical experiments.•Discussed the implications for managers of manufacturing companies.