The sources and links in the following provide capacity and generation data related to the California solar industry, as well as studies and reports on related issues.


The California Independent System Operator (CAISO) is a nonprofit public benefit corporation that operates the majority of California’s wholesale electricity market and manages the reliability of its transmission grid. The CAISO does not own transmission facilities, but provides centralized management of the grid and is responsible for maintaining the constant and efficient flow of electricity throughout the state. In managing the grid, the CAISO is responsible for facilitating reliable integration of the renewable generation necessary to meet California’s renewables portfolio standard. As part of its function, the CAISO compiles and reports a variety of statistics on supply and generation by resource type, and renewable energy production.*

Daily Renewables Watch
The CAISO daily Renewables Watch provides information about actual renewable production within the ISO grid as California moves towards a 33 percent renewable generation portfolio. Tables allow the user to obtain at least three years of past daily production data.

Today’s Outlook
An at-a-glance view of supply and demand, renewable energy production, emergency notifications and requests for energy conservation.

*Because CAISO reports data sourced by utilities, it does not identify distributed generation resources (e.g. capacity and production by rooftop solar arrays) on the “consumer” side of the meter in its datasets.


There are numerous power plant databases and summaries on the California Energy Commission (CEC) website that provide information on solar and other renewable energy developments in the state. Links to several are provided in the following. Note that some sites and links are updated several times a year, while others are updated annually or even less frequently. Thus links are subject to change before we provide updates.

Database of In-State Generators
The CEC has data collection regulations for all existing generators that are 1 MW and larger in California. The website provides detailed information on California power plants and related generation facilities, which includes a database of all individual in-state generators characterized by location, size, type of fuel, technology and over two dozen other parameters in a spreadsheet format available for sorting:

Renewable Energy Projects in Development
A map and list of all renewable energy projects 1 MW and above throughout California that are either under permitting review or in various stages of construction.

Renewable Energy Progress Report
A well-documented, well-organized discussion of the status of the state toward achieving its Renewables Portfolio Standard (RPS) targets and other renewable capacity and production targets, updated periodically.


California’s Renewables Portfolio Standard (RPS) requires all retail sellers of electricity to increase procurement from eligible renewable energy resources to 50% of total procurement by 2030. The current RPS target, established in 2015, expands on the 33% by 2020 RPS requirement previously set by the state. The CPUC implements and administers RPS compliance rules for investor-owned utilities (IOUs), electric service providers, and community choice aggregators.

The CPUC’s reports to the state Legislature on IOU progress toward their RPS goals and actions taken to achieve those goals, with charts and tables documenting actual and forecasted RPS capacity and generation. A collection of RPS program-related reports, presentations, documents and charts on the status of renewable (including solar) energy capacity and generation in California can be found on CPUC’s RPS program website .


The California Solar Initiative (CSI) provides incentives for solar system installations to customers of the state’s three investor-owned utilities—Pacific Gas & Electric Company, Southern California Edison and San Diego Gas & Electric—and is overseen by the California Public Utilities Commission. The CSI Program was created in 2007 to provide rebates on a sliding scale, with the goal of installing 1,940 MW of solar capacity by the end of 2016. The CSI-Thermal Program seeks to offset the production of 585 million therms of gas by incentivizing the installation of approximately 200,000 new solar hot water systems between 2010 and 2017.

For CSI Program information and resources, visit:
» CA Public Utilities Commission Website > California Solar Initiative
» Go Solar California

California Solar Statistics (CSS)
The official reporting site of the CSI Program provides program data summaries (updated weekly) for the CSI General Market program and the smaller Single Family Affordable Solar Homes (SASH) and Multifamily Affordable Solar Housing (MASH) programs. Data is presented in figures and tables (with several display options). Users can also download the complete data set of solar installations incentivized by the program for their own analysis.

CSI Annual Program Assessments & Progress Reports
The CPUC’s annual reports to the California State Legislature on the progress of the California Solar Initiative (CSI) program, and other CSI program-related reports.