Buildings 48–1 through 48–5 were transformer houses. The city of Peru provided a 33,000 volt transmission line that fed a sub-station at the northeast corner of the base. The sub-station had three 500KVA step down transformers that took the voltage from 33,000 volt, 3 phase, 3 wire to 12,500 volt, 3 phase, 4 wire. Primary distribution was then by aerial or underground transmission to secondary distribution locations. There were of overhead line, with of bare copper wire; and of underground line, with of lead covered cable, of fiber conduit encased in concrete and 58 manholes. To further step down the voltage for use in buildings, 18 transformer banks were utilized, with 67 oil insulated, air cooled transformers in transformer vaults and transformer houses, with a total capacity of 3,119 KVA volts. Standby emergency electricity was supplied by two generators connected to two 12 cylinder gasoline engines.