In December 2017, California adopted the Solar on Multifamily Affordable Housing Program (SOMAH) to provide low-income tenants with access to clean energy. The maps and charts below provide information on multifamily affordable homes and solar potential related to the SOMAH program.
- Select or hover over a property or utility territory to display the relevant data.
- Zoom in and out to find individual properties.
- Adjust the filter criteria and search by address or ZIP code to customize your results.
- Download any of the underlying data by exiting the full screen, selecting the chart/map you are interested in, and pressing the “download” button at the bottom right of the visualization.
For best visualization, click on the“full screen” button at the bottom right. To undo all filters, click on the “reset”button at the bottom right. For details on the data and methodology, please refer to the Notes below.
1 The SOMAH program implements Assembly Bill 693 through Decision D.17-12-022 of the California Public Utilities Commission (CPUC).
2 To be eligible for the SOMAH program, a multifamily building must be located in a disadvantaged community (see Note 3) OR at least 80% of the households in the property must be classified as low-income(see Note 4).
3 Disadvantaged communities (DACs) are areas that score in the top 25% of census tracts statewide on the California CalEnviroScreen 3.0 metric. Census tracts that do not have an overall CalEnviroScreen score but are in the highest 5% of CalEnviroScreen’s Pollution Burden indicator are also designated as disadvantaged communities.
4Low-income households are households with incomes at or below 60% of the area median income (AMI) as defined in subdivision (f) of Section 50052.5 of the Health and Safety Code.
5 The database of multifamily affordable households used for this map was compiled by the California Housing Partnership Corporation (CHPC). For more details visit: https://chpc.net/policy-research/preservation/preservation-clearinghouse/
6 The rooftop solar potential estimates for each building were sourced from Google Project Sunroof. Some of the estimates may not be accurate especially for properties with multiple buildings. Not every building in our database is in the Google Sunroof coverage area. The “Max kW DC” is the maximum system size that could be placed on the roof, including north-facing roof planes and other places that are not economically sound choices. The maximum panel layout is limited to 1 MW (or 4000 panels with a 250W nominal size for each panel).
7 There are six investor-owned utilities (IOUs) in California: Pacific Gas & Electric (PG&E), Southern California Edison (SCE), San Diego Gas & Electric (SDG&E), PacifiCorp, Liberty Utilities and Bear Valley Electric Service (BVES). Many of the multifamily affordable buildings in California are located in publicly-owned utility (POU) territories labeled “n/a” on the map and colored in grey. These properties are not eligible for the SOMAH program.