Abstract Due to the expansion of renewable energies in Germany, the electrical energy supply is shifting to a complex and volatile system. Therefore, supply and demand need to be synchronized in an efficient way. Companies can profit from capacity based supply conditions and price volatility of the market by implementing the concept of energy flexibility. The objective is, to transform the supply and price signals into the production organization. As one option, a production site can adapt its operation and therewith its power demand. This paper aims to develop a heuristic method for machine scheduling and to apply the result to a given problem, which considers energy flexibility.