As with most of Arizona, Phoenix does not observe daylight saving time. In 1973, Gov. Jack Williams argued to Congress that energy use would increase in the evening. Refrigeration units were not used as often in the morning on standard time. He went on to say that energy use would rise "because there would be more lights on in the early morning." He was also concerned about children going to school in the dark, which indeed they were. Navajo Nation lands in Northeastern Arizona observe daylight saving time in conjunction with the rest of their tribal lands in other states.