This is to be expected since many motors will not be operating at their full rated horsepower, but
somewhere down the curve. One can simply allocate the percent difference over the
entire population of motors in order to close the balance.
A good power balance will also account for “switchable” drivers—that is, pumps
or compressors that can be switched between a motor and a steam turbine. When the
motor is used, there is a demand for electric power.When the steam turbine is used, the
electric power demand disappears, but there is an impact on the steam balance (see
Chapter 18).