Electricity from the dam’s powerhouse was originally sold pursuant to a fifty-year contract, authorized by Congress in 1934, which ran from 1937 to 1987. In 1984, Congress passed a new statute which set power allocations from the dam from 1987 to 2017. The powerhouse was run under the original authorization by the Los Angeles Department of Water and Power and Southern California Edison; in 1987, the Bureau of Reclamation assumed control.
On December 20, 2011, legislation extending the current contracts until 2067 was signed, after setting aside 5% of Hoover Dam’s power for sale to Native American tribes, electric cooperatives, and other entities. The new arrangement will begin in 2017.