Multifamily Affordable Solar Housing


CSE administered Multifamily Affordable Solar Housing (MASH) Program incentives in San Diego Gas & Electric (SDG&E) territory. The goal was to combine energy efficiency and solar photovoltaic (PV) to help improve the overall quality of affordable housing and decrease energy use and costs for occupants.

Through MASH, the California Public Utilities Commission set aside $162 million to assist multifamily, low-income housing in offsetting the cost of installing PV systems on multitenant affordable housing developments in California. MASH was part of the larger California Solar Initiative Program.


Multifamily Affordable Solar Housing Impacts

3,048 MT of CO2 offset
Since MASH’s inception in 2008, projects receiving CSE-issued incentives are reducing greenhouse gas emissions equivalent to 3,048 metric tons of carbon dioxide per year – about the same as not burning 3.27 million tons of coal.
Solar education
During 2008-15, the MASH program held 18 workshops for more than 500 multitenant building owners and contractors.
$10M in rebates

CSE administered and processed 41 MASH projects in the region.

Program at a Glance

Program Goals

Install roughly 215 MW of solar electric capacity statewide at multifamily affordable housing communities

CSE's Role

Program administrator for San Diego Gas & Electric territory


Key Partners

California Energy Commission, California Public Utilities Commission, San Diego Gas & Electric, Pacific Gas and Electric, Southern California Edison

State Policies Supported

SB 1, AB 217

Impact Statement

2.6 MW of PV installed since 2008 accompanied by $10 million in incentives statewide