Find out how the program is fostering solar energy systems


Please Note: The Multifamily Affordable Solar Housing (MASH) Program is closing after 13 years at the end of 2021. Therefore, the MASH program is no longer accepting new applications.


Launched in 2019, the Solar on Multifamily Affordable Housing (SOMAH) program provides financial incentives for installing photovoltaic (PV) energy systems on multifamily affordable housing. The California Public Utilities Commission issued Resolution E-5054 (PDF, 856 KB), limiting participation of a solar project to either MASH or the SOMAH Program, but not both. For more information on the SOMAH program, visit the SOMAH website.


What is MASH?


MASH is a program that provides incentives to offset the cost of installing new solar energy systems on multifamily affordable housing in California. MASH aims to improve the quality of housing, decrease energy use and lower costs for tenants. It also urges tenants to use high-performance solar systems that help protect California's environment.


The program began its first iteration on November 16, 2007, when the California Public Utilities Commission (CPUC) set aside $108 million for low-income families in multifamily dwellings. MASH received $54 million more in 2015 and reopened the program to those waitlisted on August 3, 2015.


Understand who benefits from the program


MASH applies to multifamily affordable housing buildings with new solar-panel energy systems. MASH helps to offset the cost of installing new solar energy systems for common areas, and to reduce monthly energy costs for tenants. The owner of the complex typically applies for the incentives.


Program details


The program provides post-installation, fixed rebates based on the size and output of the solar energy system. A contractor can help applicants decide on the system’s size. The contractor can also help allocate the percentages of system-generated power between common areas and tenant areas to boost benefits.


The PG&E Virtual Net Energy Metering (NEM2VMASH) tariff allows all tenants in an affordable housing complex to benefit from energy generation credits gained from the building's solar system. Learn more about the program.



Download ELECTRIC SCHEDULE NEM2VMSH (PDF, 653 KB)

The following table states the requirements for the two incentive amounts.

Adopted MASH incentive tracks

Incentive AmountEligibility Requirements
IC: PV system Offsetting Common Area Load, Non-VNM Tenant Load, or VNM Tenant Load with <50% Benefit

$1.10/watt

  • Provide job training opportunity to more than one trainee, with one additional trainee for each 10KW up to 50KW
  • Conduct onsite walkthrough energy audit at ASHRAE level I or higher, or enroll in a utility, REN, CCA or federally provided whole-building multifamily energy efficiency program.
  • Portion of system allocated to offsetting one of the following:
    • Common area load
    • Non-VNM area load
    • VNM tenant load where tenant receives less than 50% of economic benefit of all allocated generation.
1D: PV System Offsetting VNM Tenant Load with ≥50% Tenant Benefit

$1.80/watt

  • Provide job training opportunity to more than one trainee, with one additional trainee for each 10KW up to 50KW
  • Conduct onsite walkthrough energy audit at ASHRAE level level I or higher, or enroll in a utility, REN, CCA or federally provided whole-building multifamily energy efficiency program.
  • Portion of system allocated to offsetting:
    • VNM tenant load where tenant receives at least 50% of economic benefit of all allocated generation.

Apply for the program


PLEASE NOTE: MASH is currently closed to new applications. Funds are expected to be exhausted by the projects currently on the waitlist.