The invention relates to a monitoring method for monitoring the energy requirement of an extrusion installation (10), comprising the following steps: Setting of a balancing limit (20), in whose balancing space (22) the extrusion installation (10) is assembled, Monitoring of at least one energy flow (30) into the balancing space (22), Monitoring of a feed flow (40) of granules in the extrusion installation (10), Determining the relation between the at least one energy flow (30) and the feed flow (40).