Energy Cost Allocation In any manufacturing plant, there are many cost variables involved in the final product. These include material costs, labour, etc. Another important cost is the cost of electrical energy to produce the product. With a Carlo Gavazzi energy meter or transducer, it is possible to monitor your energy usage. Furthermore, energy usage can be broken down for periods in a day (ie. shifts). This helps to identify non-productive periods before they impact on the bottom line.