Taken Directly From energy.gov:
SECTOR NAME
State
ADMINISTRATOR
California State Board of Equalization
EXPIRATION DATE

12/31/2024

STATE
California
PROGRAM TYPE
Property Tax Incentive
REBATE AMOUNT

100% of system value; 75% of system value exemption for dual-use equipment

SUMMARY

Section 73 of the California Revenue and Taxation Code allows a property tax exclusion for certain types of solar energy systems installed between January 1, 1999, and December 31, 2024. This section was amended by AB 1451 in September 2008 to include the construction of an active solar energy system incorporated by an owner-builder in the initial construction of a new building that the owner-builder does not intend to occupy or use. This only applies if the owner-builder did not already receive an exclusion for the same active solar energy system and only if the initial purchaser purchased the new building prior to that building becoming subject to reassessment to the owner-builder. ABX1-15 of 2011 clarified that systems installed through sale-leaseback arrangements or partnership flip structures can benefit from this exclusion. Click here and here for Letters to Assessors from the State Board of Equalization that further explain the impact of ABX1-15.