California Code, Public Utilities Code - PUC § 12723

Whenever the board, by resolution passed by a majority of its members, determines that the public interest will be served, a district constructing or operating plants and appurtenant facilities for the generation of electrical power by nuclear energy may purchase or acquire insurance for such properties against physical loss or damage and the resultant loss of capacity for the generation of electrical power from insurance companies organized in the United States or foreign countries as either stock companies or assessment or nonassessment mutual companies.  In the event such insurance is acquired from an assessment mutual company, a district shall have authority to share in the initial organization expenses of the company, to become a member of the company, and to assume liability for retrospective premium adjustments in accordance with the terms and conditions of the policy or contract of insurance issued by such company.