Framework / Assessment California Forests and Rangelands: Proposed Indicators Summary Measure contribution of forest biomass towards attainment of policy goals for use of renewable energy sources. California's Renewables Portfolio Standard (RPS) requires investor-owned utilities, electric service providers, and community choice aggregators to increase procurement from eligible renewable energy resources to 33% of total procurement by 2020 (CPUC). Forest biomass is one of many eligible sources.