Cal. Wat. Code § 71663
A district may (a) pursuant to contract, provide, sell, and deliver hydroelectric power to the United States of America or any board, department or agency thereof, to the State of California for the purposes of the State Water Resources Development System, and to any public agency, private corporation, or other person or entity, or any combination thereof, engaged in the sale of electric power at retail; or (b) use all or any part of such hydroelectric power directly, or indirectly through exchange, in exercising any of the powers described in Section 71590 or as otherwise provided by law.
For the purposes of this section, "public agency" means a city, county, city and county, district, local agency, public authority, or public corporation.
Ca. Water Code § 71663