Cal. Pub. Util. Code § 366.5
(a) No change in the aggregator or supplier of electric power for any small commercial customer may be made until one of the following means of confirming the change has been completed:
(b) No change in the aggregator or provider of electric power for any residential customer may be made over the telephone until the change has been confirmed by an independent third-party verification company, as follows:
(1) The third-party verification company shall meet each of the following criteria:
(c) No change in the aggregator or provider of electric power for any residential customer may be made via an Internet transaction, in which the customer accesses the website of the aggregator or provider, unless both of the following occur with respect to confirming the change:
(1) In addition to any other information gathered in the course of the transaction, the customer shall be asked to read and respond to a separate screen that states, in easily legible text, the following:
“I acknowledge that in entering this transaction I am voluntarily choosing to change the entity that supplies me with my electric power.”
(d)
(1) No change in the aggregator or provider of electric power for any residential customer may be made via a written transaction unless the change has been confirmed, as provided in this subdivision. In order to comply with this subdivision, in addition to any other information gathered in the course of the transaction, and in addition to any other signature required, the customer shall be asked to sign and date a document separate from that written transaction, containing the following words printed in 10-point type or larger:
“I acknowledge that in signing this contract or agreement, I am voluntarily choosing to change the entity that supplies me with electric power.”