Clean Energy TA & Demonstrations

The California Housing Partnership works directly with nonprofit affordable housing owners and public housing authorities to help them identify creative ways to finance energy and water retrofits and clean energy improvements for their properties. This involves educating owners about the programs and opportunities for incentives available to them, as well as developing innovative demonstration projects to explore new technologies, financing tools and business models for affordable rental homes.

Low-Income Weatherization Program (LIWP)

The California Low-income Weatherization Program for Multifamily Properties (LIWP) installs rooftop solar systems, solar hot water heater systems and weatherization measures on low-income multifamily properties in disadvantaged communities to reduce greenhouse gas emissions and save energy.

The California Housing Partnership works closely with the Association for Energy Affordability to lead the outreach effort for LIWP and provide technical assistance to affordable housing owners and operators.

For information about LIWP, please contact Michael Claproth at mclaproth[at]

Solar on Multifamily Affordable Housing (SOMAH)

The Solar on Multifamily Affordable Housing (SOMAH) program provides financial incentives for installing photovoltaic (PV) energy systems on multifamily affordable housing in California. The program delivers clean power and credits on energy bills to hundreds of thousands of the state’s affordable housing residents. SOMAH is overseen by the California Public Utilities Commission (CPUC).

The California Housing Partnership works closely with the CPUC to lead the outreach effort for SOMAH and provide technical assistance to affordable housing owners and operators.

For information about SOMAH, please contact Rachael Diaz at rdiaz[at]

GREEN Network

The California Housing Partnership (The Partnership) convenes the Green Rental home Energy Efficiency Network (GREEN) for mission-driven multifamily affordable housing owners working to collaboratively increase access to solar, energy efficiency, clean energy and water conservation resources for affordable rental properties and low-income renters in California. In recognition of the key role that energy and water costs play in the long-term financial feasibility of operating affordable housing, GREEN was founded in 2010 and includes more than 50 nonprofit and government housing organizations active statewide with extensive experience in financing, installing and maintaining clean and efficient energy systems in multifamily affordable communities.

For information about GREEN, please contact Srinidhi Sampath Kumar at ssampath[at]

Demonstration Projects

The California Housing Partnership partners with mission-aligned organizations to demonstrate innovate energy and water technologies, business models and financing solutions for affordable rental homes.

In 2020, we published a report on crossover in plumbing systems that typically occurs when valves fail or leak and water mixes between a building’s hot and cold water pipes. The report provides information for multifamily building owners and presents targeted crossover investigation and repair strategies to decrease high water use and reduce energy bills.

In 2017, we published a case study on our Santa Monica test of financing energy savings through on-bill repayment, rather than through a loan. Our findings helped to shape California’s statewide on-bill repayment pilot, which launched in 2018.

View more of the Partnership’s Sustainable Housing resources.