123SEI partners with leading organizations and agencies to support local governments, schools, and agencies as they move toward sustainability. Our partners are important to us, and we value them greatly for the vision, expertise, and resources they bring to our shared projects — allowing us to more effectively help our clients save energy and money, embrace cleaner energy alternatives and adopt sustainable practices now and for future generations.





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State & Federal Government

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Local Government

County of Marin, County of Alameda, County of San Mateo

City of Oakland, City of San Jose, City of San Rafael, City of Sunnyvale


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Regional Organizations

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  Educational Institutions

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San Carlos School District, San Francisco School District, San Rafael City Schools

Past Partners


Ag Biomass Council, B.V.I.- British Virgin Islands, Bay Area Air Quality Management District, Bay Area Climate Collaborative (BACC), Bay Area Community Resources (BACR), California Campus Compact, City of Fresno, City of Visalia, Department of Energy, Dominican University, Environmental Protection Agency, GRID Alternatives, Marin Energy Efficiency Program, Navigant, Nexant, Quantum Energy Services & Technologies (QUEST), Sacramento Municipal Utilities District (SMUD), San Joaquin County Clean Energy Organization, Southern California Gas, State Farm, Town-Green, Workforce Investment Board