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CSI Multifamily Affordable Solar Housing (MASH) Program


NOTE: The MASH program is currently closed to new applications.  The Program Administrators will begin reviewing applications on the program waitlist on August 3, 2015 and expect to determine by mid-September 2015 if there will be funding remaining to open the program to new applications. Please see the section below titled Program Waitlist for more information.

The California Solar Initiative's Multifamily Affordable Solar Housing (MASH) Program has issued the July 2015 edition of the MASH Semi-Annual Progress Report, which provides detailed information on the MASH Program's progress in each of the three service territories in California. Recent highlights and milestones of the program include:

  • 22.7 MW of solar capacity is now interconnected across 353 projects statewide that serve multi-family affordable housing.

  • 35 MASH Track 1 projects are currently reserved, with capacity of more than 5.85 MW.

  •  More than $76 million has been paid to completed projects; an additional $14.7 million is reserved for pending projects.

  • After being expanded by previous CPUC decisions, there are now over 6,770 tenant units participating in Virtual Net Metering thanks to the MASH program.

AB 217 Implementation

Assembly Bill 217 (Bradford, 2013) extended the MASH and SASH programs of the California Solar Initiative with $108 million in new funding, and set several new goals for the programs. To read the Energy Division’s July 2014 staff proposal regarding the implementation of AB 217 at the Commission, please visit this link. For this and all other documents released in the Commission’s R.12-11-005 rulemaking, please visit the R.12-11-005 Docket Card page.


On January 29, 2015, the CPUC approved a decision to revise MASH’s enrollment eligibility requirements, capacity target, job training requirements, incentive levels, and program budget.


On April 30, 2015, PG&E hosted a workshop on the new energy efficiency requirements under the reauthorized MASH Program. To access the slides from the workshop please visit this link.


On July 31, 2015 the CPUC approved the MASH Handbook, outlining information and guidelines for the reauthorized MASH Program.


The Energy Division has hired Navigant Consulting, Inc. to perform in-depth evaluations of CSI SASH and MASH program design, delivery, operations, and impact in 2014 and 2015. This new round of program evaluation will build upon the previous SASH and MASH studies completed in 2011, available through the links below. Energy Division staff anticipate the release of three reports by mid-2015: a program administrator and market assessment, a benefit-cost analysis, and a summary of program design recommendations encompassing both programs.

On August 4, 2011, Navigant Consulting, Inc issued the CSI SASH and MASH Impact and Cost Benefit Report.

On June 10, 2011, Navigant Consulting, Inc issued the CSI MASH Biennial Report

On April 5, 2011, Navigant Consulting, Inc issued the CSI SASH and MASH Program Administrator Performance Assessment Report, which provides an evaluation of the MASH Program."

On April 1, 2011, Navigant Consulting, Inc issued the SASH program.  The CSI SASH and MASH Market Assessment Report, which provides an evaluation of the MASH program.


Program Waitlist

The Multifamily Affordable Solar Housing (MASH) program across all three Program Administrator (PA) territories – Southern California Edison (SCE), Pacific Gas & Electric (PG&E) and Center for Sustainable Energy (CSE) closed its waitlist statewide to new applications on April 10, 2014 at 5pm PDT.

The Program Administrators will begin reviewing applications currently on the program waitlist on August 3, 2015.  Projects on the waitlist will have 30 days from the date requested by the Program Administrator to provide documentation of meeting the new program requirements.  If the documentation provided is insufficient or incomplete, applicants will be given an additional 10 days from the date they are notified by the Program Administrator to submit the required documentation before being removed from the queue. Should you have any questions, please feel free to contact the Program Administrator in your service territory. Program Administrator contact information can be found below.

About the MASH Program

Established in 2008, the MASH Program provides solar incentives on qualifying affordable housing multifamily dwellings.  The goals of the MASH program are to:

Stimulate the adoption of solar power in the affordable housing sector;

Improve energy utilization and overall quality of affordable housing through the application of solar and energy efficiency technologies;

Decrease electricity use and costs without increasing monthly household expenses for affordable housing building occupants; and

Increase awareness and appreciation of the benefits of solar among affordable housing occupants and developers.

Maximize the overall benefit to ratepayers.

Require participants who receive monetary incentives to enroll in the Energy Savings Assistance (ESA) program, if eligible.

Provide job training and employment opportunities in the solar energy and energy efficiency sectors of the economy.

The MASH program provides fixed, up front, capacity-based incentives for qualifying solar energy systems. The amount of the incentive depends on which Track (1C or 1D) the applicant is eligible for.

MASH Incentive Rates ($/Watt)

Track 1C – PV System Offsetting one of the following:

  •  Common Area Load
  • Non-VNM Tenant Load
  • or VNM Tenant Load with <50% Tenant Benefit


Track 1D – PV System Offsetting:

  • VNM Tenant Load with ≥50% Tenant Benefit


For more information on the CSI MASH Program, please consult the MASH Program Handbook.
For information on the launch of the CSI MASH Program, please read the CPUC regulatory decision that authorized the program and the January 2015 decision that reauthorized the program.You may also contact the CPUC's Distributed Generation team with regulatory questions.

Program Administrators

The MASH program is managed by the Program Administrators of the General Market CSI Program: Pacific Gas & Electric Company, Southern California Edison, and The Center for Sustainable Energy in San Diego Gas & Electric territory.  Please contact the Program Managers with eligibility questions, program applications, solar and energy efficiency questions and in identifying loans, grants and other financing options.  The MASH Program Administrators can be contacted at:

  • Pacific Gas & Electric - Solar Customer Service Center 1-877-743-4112, Solar Hotline 415-973-3480
  • Southern California Edision - Contact 866-584-7436
  • In San Diego Gas & Electric territory - Contact the California Center for Sustainable Energy at 858-244-1177 or

Last Modified: 8/3/2015

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