The BOR owns and operates, but Az and Nv are paid from its profits because it sits on their land. Also, Az and Nv are the principle contractors for the energy. It most definately could be a problem for SoCal. Maybe not much, but it could be a little leverage.
Bureau of Reclamation: Lower Colorado Region - Hoover Dam Power FAQs
Who are the principal contractors for energy?
The States of Arizona and Nevada; City of Los Angeles; Southern California Edison Co.; Metropolitan Water District of Southern California; California cities of Glendale, Burbank, Pasadena, Riverside, Azusa, Anaheim, Banning, Colton, and Vernon; and the city of Boulder City, Nevada.
How is the firm energy generated at Hoover Dam allocated?
Arizona - 18.9527 percent
Nevada - 23.3706 percent
Metropolitan Water District of Southern California - 28.5393 percent
Burbank, CA - 0.5876 percent
Glendale, CA - 1.5874 percent
Pasadena, CA - 1.3629 percent
Los Angeles, CA - 15.4229 percent
Southern California Edison Co. - 5.5377 percent
Azusa, CA - 0.1104 percent
Anaheim, CA - 1.1487 percent
Banning, CA - 0.0442 percent
Colton, CA - 0.0884 percent
Riverside, CA - 0.8615 percent
Vernon, CA - 0.6185 percent
Boulder City, NV - 1.7672 percent
How is the income from the sale of power used?
To pay all operation, maintenance and replacement costs (including interest expense and repayment of investments) to meet the requirements of the project. The cost of construction completed and in service by 1937 was repaid from power revenues by May 31, 1987, except for costs relating to flood control. Repayment of the $25 million construction costs allocated to flood control will be repaid by 2037. Any features added after May 31, 1987 will be repaid within 50 years of the date of installation or as established by Congress. In addition, Arizona and Nevada each receive $300,000 annually in lieu of taxes.