CSI-Thermal Recent Program News

The CSI-Thermal program provides rebates to utility customers who install solar thermal systems to replace water-heating systems powered by natural gas.

  • In compliance with Public Utilities Code 2863 (a)(4), please find the California Solar Initiative (CSI) Thermal Cost Effectiveness study presented by the California Public Utilities Commission.  The study was conducted by Itron and provides an evaluation of the cost-effectiveness of the program and assesses the program's success in achieving its statutory goals.
  • On December 2, 2019, the Energy Division issued the second CSI Thermal Program Impact Evaluation Report.
  • On June 22, 2018, Energy Division issued the CSI Thermal Program Impact Evaluation Report
  • On March 17, 2016, the CPUC approved PG&E Advice 3691-G/4800-E/CSE Advice 69/ SCG Advice 4930 to shift $25 million from all sectors of the CSI-Thermal general market budget to the CSI-Thermal low-income budget, increasing the total low-income budget to $50 million.
  •  On October 1, 2015, the Commission approved Decision 15-10-004, modifying the CSI Thermal program to expand the eligibility requirements for single-family low income customers.
  • On January 29, 2015, the CPUC approved Decision 15-01-035, which increased incentive rates for the gas-displacing program, revised sub-program budgets, and established project incentive caps for multifamily /commercial and solar pool heating projects.
  • On January 29, 2014, the CPUC issued a report to the Legislature, the Review of the Incentive Levels of the CSI-Thermal Program, pursuant to AB 2249 (Buchanan, 2012).   
  • In July 2009 Energy Division issued a Staff Report on a Solar Water Heating program and invited comments.


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