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Welcome to California Solar Statistics

California Leads the Nation

  • 438,253 solar projects
  • 3,456 megawatts installed
  • $5.35 avg cost/watt <10kW
  • $4.44 avg cost/watt >10kW

NOTE: Above figures include non-CSI data
last updated: Nov. 18, 2015 data sources

California Solar Statistics (CSS) is the official public reporting site of the California Solar Initiative (CSI), presented jointly by the CSI Program Administrators and the California Public Utilities Commission. Here you will find actual program data summaries for the CSI General Market, Multifamily Affordable Solar Housing (MASH), and Single Family Affordable Solar Homes (SASH) programs as well as solar PV NEM interconnection data. Data is provided in several figures and tables, and can also downloaded for analysis.

Net Energy Metering (NEM) Interconnection Data Now Available

Interconnection data on California Solar Statistics fully captures solar PV net energy metering (NEM) participation in IOU territories (PG&E, SCE and SDG&E). NEM interconnection data sets undergo data integrity tests to ensure data quality, and are currently refreshed monthly. Due to the very large number of data entries, and because the data have been collected by different departments using different protocols, there are some remaining differences between the CSI and the NEM data – please see the “Read Me” file with each data set for more information. At present, the graphs and tables on this website represent only the CSI Working Data Set. New NEM interconnection data will be incorporated into the graphs and tables in the coming months. Download NEM Interconnection and CSI Data.

How to Use California Solar Statistics

View Solar Statistics
From the average cost per watt of a solar system, to the city with the most roof-top solar, to the total number of MW installed, the View Solar Statistics menu provides the most up-to-date information on the California Solar Initiative. The dynamic filters on each figure allow you to slice and dice the program data to suit your research and evaluation needs. Explore the View Solar Statistics menu at the top of the left navigation to get started.

Find an Active Solar Contractor
Looking for a solar contractor? Want to know how your current contractor stacks up against the competition? Find and compare solar contractors working in your area with just a few quick clicks.

Download NEM Interconnection and CSI Data
Get your hands on the data behind the figures and tables. Spreadsheets containing comprehensive information for the entire program are available here for download.

Looking for a specific project or want to see all the projects in a certain utility’s territory? Search for pending and completed projects by any combination of Program Administrator, Customer Sector, Application Status or Program Type.

FAQs and Facts
Get the answers to your California Solar Statistics-related questions by visiting the FAQ.