Cal. Gov. Code § 51191.2
The execution and acceptance of a deed or other instrument described in subdivision (c) of Section 51190 shall constitute a dedication to the public of the use of lands for solar photovoltaic use. Any term easement and covenant shall run for a term of not less than 20 years unless a shorter term is requested by the landowner, in which case the term may be not less than 10 years. A solar-use easement for a term of years may provide that on the anniversary date of the acceptance of the solar-use easement, or on any other annual date as specified by the deed or other instrument described in subdivision (c) of Section 51190, a year shall be added automatically to the initial term unless a notice of nonrenewal is given as provided in Section 51192.
Ca. Gov. Code § 51191.2