From https://www.ncsl.org/research/energy/renewable-portfolio-standards.aspx
California
Title: Renewables Portfolio Standard.
Established: 2002.
Requirement: 44% by 2024; 52% by 2027; 60% by 2030. Also requires 100% clean energy by 2045.
Applicable Sectors: Investor-owned utility, municipal utilities.
Cost Cap: Determined by the California Public Utilities Commission.
Details: A 2013 amendment allows the California Public Utilities Commission to adopt additional requirements.
Enabling Statute, Code or Order: Cal. Public Utilities Code §399.11 et seq.; Cal. Public Resources Code §25740 et seq.; Assembly Bill 327 (2013); Senate Bill 350 (2015); Senate Bill 100 (2018).