Gov. Code, § 51192

(a) A solar-use easement may be extinguished on all or a portion of the parcel only by nonrenewal, termination, or by returning the land to its previous contract pursuant to Article 3 (commencing with Section 51240) of Chapter 7.

(b) (1) If either the landowner or the county or city desires in any year not to renew the solar-use easement on all or a portion of the parcel, that party shall serve written notice of nonrenewal of the easement upon the other party at least 90 days in advance of the annual renewal date of the solar-use easement. Unless written notice is served at least 90 days in advance of the renewal date, the solar-use easement shall be considered renewed as provided in Section 51191.2.

(2) Upon receipt by the owner of a notice from the county or city of nonrenewal, the owner may make a written protest of the notice of nonrenewal. The county or city may, at any time prior to the renewal date, withdraw the notice of nonrenewal.

(c) If the county, city, or the landowner serves notice of intent in any year not to renew the solar-use easement, the existing solar-use easement shall remain in effect for the balance of the period remaining since the original execution or the last renewal of the solar-use easement, as the case may be.