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1-4 According to [13], electricity generation in the U.S. in year 2000 was approximately 3.8x10° MW-hrs. Fig. 1-7 shows that 16% of that is used for heating, ventilating and air conditioning.

Based on [3, 14], as much as 30% of the energy can be saved in such systems by using adjustable speed drives. On this basis, calculate the savings in energy per year and relate that to 1000-MW generating plants needed to operate constantly to supply this wasted energy.

Fig: 1