The use of cogeneration (i.e., making power and heat to utilize the maximum energy content of the fuel is Utilization, usually represented by . How would you write the utilization for a process that delivers A [kWhe] net of electricity and B [kWht] of heat for constructive uses (e.g., heating of a college campus), from a primary energy input of C [kWh] and some electrical pump work input D [kWhe]?